/*
This file is part of GNUnet
- (C) 2009 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2009-2017 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
-
/**
* @file util/scheduler.c
* @brief schedule computations using continuation passing style
* @author Christian Grothoff
*/
#include "platform.h"
-#include "gnunet_common.h"
-#include "gnunet_os_lib.h"
-#include "gnunet_scheduler_lib.h"
-#include "gnunet_signal_lib.h"
-#include "gnunet_time_lib.h"
+#include "gnunet_util_lib.h"
#include "disk.h"
-#ifdef LINUX
-#include "execinfo.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "util-scheduler", __VA_ARGS__)
+
+#define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util-scheduler", syscall)
+#if HAVE_EXECINFO_H
+#include "execinfo.h"
+
/**
* Use lsof to generate file descriptor reports on select error?
* (turn off for stable releases).
*/
-#define USE_LSOF GNUNET_YES
+#define USE_LSOF GNUNET_NO
/**
* Obtain trace information for all scheduler calls that schedule tasks.
*/
#define EXECINFO GNUNET_NO
+/**
+ * Check each file descriptor before adding
+ */
+#define DEBUG_FDS GNUNET_NO
+
/**
* Depth of the traces collected via EXECINFO.
*/
#define MAX_TRACE_DEPTH 50
#endif
-#define DEBUG_TASKS GNUNET_NO
-
/**
* Should we figure out which tasks are delayed for a while
* before they are run? (Consider using in combination with EXECINFO).
*/
#define DELAY_THRESHOLD GNUNET_TIME_UNIT_SECONDS
+
+/**
+ * Argument to be passed from the driver to
+ * #GNUNET_SCHEDULER_run_from_driver(). Contains the
+ * scheduler's internal state.
+ */
+struct GNUNET_SCHEDULER_Handle
+{
+ /**
+ * Passed here to avoid constantly allocating/deallocating
+ * this element, but generally we want to get rid of this.
+ * @deprecated
+ */
+ struct GNUNET_NETWORK_FDSet *rs;
+
+ /**
+ * Passed here to avoid constantly allocating/deallocating
+ * this element, but generally we want to get rid of this.
+ * @deprecated
+ */
+ struct GNUNET_NETWORK_FDSet *ws;
+
+ /**
+ * Driver we used for the event loop.
+ */
+ const struct GNUNET_SCHEDULER_Driver *driver;
+
+};
+
+
/**
- * Linked list of pending tasks.
+ * Entry in list of pending tasks.
*/
-struct Task
+struct GNUNET_SCHEDULER_Task
{
/**
* This is a linked list.
*/
- struct Task *next;
+ struct GNUNET_SCHEDULER_Task *next;
+
+ /**
+ * This is a linked list.
+ */
+ struct GNUNET_SCHEDULER_Task *prev;
/**
* Function to run when ready.
*/
- GNUNET_SCHEDULER_Task callback;
+ GNUNET_SCHEDULER_TaskCallback callback;
/**
- * Closure for the callback.
+ * Closure for the @e callback.
*/
void *callback_cls;
+ /**
+ * Handle to the scheduler's state.
+ */
+ const struct GNUNET_SCHEDULER_Handle *sh;
+
/**
* Set of file descriptors this task is waiting
* for for reading. Once ready, this is updated
struct GNUNET_NETWORK_FDSet *write_set;
/**
- * Unique task identifier.
+ * Information about which FDs are ready for this task (and why).
*/
- GNUNET_SCHEDULER_TaskIdentifier id;
+ const struct GNUNET_SCHEDULER_FdInfo *fds;
/**
- * Identifier of a prerequisite task.
+ * Storage location used for @e fds if we want to avoid
+ * a separate malloc() call in the common case that this
+ * task is only about a single FD.
*/
- GNUNET_SCHEDULER_TaskIdentifier prereq_id;
+ struct GNUNET_SCHEDULER_FdInfo fdx;
/**
* Absolute timeout value for the task, or
- * GNUNET_TIME_UNIT_FOREVER_ABS for "no timeout".
+ * #GNUNET_TIME_UNIT_FOREVER_ABS for "no timeout".
*/
struct GNUNET_TIME_Absolute timeout;
struct GNUNET_TIME_Absolute start_time;
#endif
+ /**
+ * Size of the @e fds array.
+ */
+ unsigned int fds_len;
+
/**
* Why is the task ready? Set after task is added to ready queue.
* Initially set to zero. All reasons that have already been
*/
int write_fd;
+ /**
+ * Should the existence of this task in the queue be counted as
+ * reason to not shutdown the scheduler?
+ */
+ int lifeness;
+
+ /**
+ * Is this task run on shutdown?
+ */
+ int on_shutdown;
+
+ /**
+ * Is this task in the ready list?
+ */
+ int in_ready_list;
+
#if EXECINFO
/**
* Array of strings which make up a backtrace from the point when this
};
+/**
+ * The driver used for the event loop. Will be handed over to
+ * the scheduler in #GNUNET_SCHEDULER_run_from_driver(), peristed
+ * there in this variable for later use in functions like
+ * #GNUNET_SCHEDULER_add_select(), #add_without_sets() and
+ * #GNUNET_SCHEDULER_cancel().
+ */
+static const struct GNUNET_SCHEDULER_Driver *scheduler_driver;
+
+/**
+ * Head of list of tasks waiting for an event.
+ */
+static struct GNUNET_SCHEDULER_Task *pending_head;
+
+/**
+ * Tail of list of tasks waiting for an event.
+ */
+static struct GNUNET_SCHEDULER_Task *pending_tail;
+
+/**
+ * Head of list of tasks waiting for shutdown.
+ */
+static struct GNUNET_SCHEDULER_Task *shutdown_head;
/**
- * List of tasks waiting for an event.
+ * Tail of list of tasks waiting for shutdown.
*/
-static struct Task *pending;
+static struct GNUNET_SCHEDULER_Task *shutdown_tail;
/**
* List of tasks waiting ONLY for a timeout event.
* building select sets (we just look at the head
* to determine the respective timeout ONCE).
*/
-static struct Task *pending_timeout;
+static struct GNUNET_SCHEDULER_Task *pending_timeout_head;
/**
- * Last inserted task waiting ONLY for a timeout event.
- * Used to (heuristically) speed up insertion.
+ * List of tasks waiting ONLY for a timeout event.
+ * Sorted by timeout (earliest first). Used so that
+ * we do not traverse the list of these tasks when
+ * building select sets (we just look at the head
+ * to determine the respective timeout ONCE).
*/
-static struct Task *pending_timeout_last;
+static struct GNUNET_SCHEDULER_Task *pending_timeout_tail;
/**
- * ID of the task that is running right now.
+ * Last inserted task waiting ONLY for a timeout event.
+ * Used to (heuristically) speed up insertion.
*/
-static struct Task *active_task;
+static struct GNUNET_SCHEDULER_Task *pending_timeout_last;
/**
- * List of tasks ready to run right now,
- * grouped by importance.
+ * ID of the task that is running right now.
*/
-static struct Task *ready[GNUNET_SCHEDULER_PRIORITY_COUNT];
+static struct GNUNET_SCHEDULER_Task *active_task;
/**
- * Identity of the last task queued. Incremented for each task to
- * generate a unique task ID (it is virtually impossible to start
- * more than 2^64 tasks during the lifetime of a process).
+ * Head of list of tasks ready to run right now, grouped by importance.
*/
-static GNUNET_SCHEDULER_TaskIdentifier last_id;
+static struct GNUNET_SCHEDULER_Task *ready_head[GNUNET_SCHEDULER_PRIORITY_COUNT];
/**
- * Highest number so that all tasks with smaller identifiers
- * have already completed. Also the lowest number of a task
- * still waiting to be executed.
+ * Tail of list of tasks ready to run right now, grouped by importance.
*/
-static GNUNET_SCHEDULER_TaskIdentifier lowest_pending_id;
+static struct GNUNET_SCHEDULER_Task *ready_tail[GNUNET_SCHEDULER_PRIORITY_COUNT];
/**
* Number of tasks on the ready list.
*/
static enum GNUNET_SCHEDULER_Priority max_priority_added;
+/**
+ * Value of the 'lifeness' flag for the current task.
+ */
+static int current_lifeness;
+
+/**
+ * Function to use as a select() in the scheduler.
+ * If NULL, we use GNUNET_NETWORK_socket_select().
+ */
+static GNUNET_SCHEDULER_select scheduler_select;
+
+/**
+ * Task context of the current task.
+ */
+static struct GNUNET_SCHEDULER_TaskContext tc;
+
+/**
+ * Closure for #scheduler_select.
+ */
+static void *scheduler_select_cls;
+
+
+/**
+ * Sets the select function to use in the scheduler (scheduler_select).
+ *
+ * @param new_select new select function to use
+ * @param new_select_cls closure for @a new_select
+ * @return previously used select function, NULL for default
+ */
+void
+GNUNET_SCHEDULER_set_select (GNUNET_SCHEDULER_select new_select,
+ void *new_select_cls)
+{
+ scheduler_select = new_select;
+ scheduler_select_cls = new_select_cls;
+}
+
/**
* Check that the given priority is legal (and return it).
}
-/**
- * Is a task with this identifier still pending? Also updates
- * "lowest_pending_id" as a side-effect (for faster checks in the
- * future), but only if the return value is "GNUNET_NO" (and
- * the "lowest_pending_id" check failed).
- *
- * @param id which task are we checking for
- * @return GNUNET_YES if so, GNUNET_NO if not
- */
-static int
-is_pending (GNUNET_SCHEDULER_TaskIdentifier id)
-{
- struct Task *pos;
- enum GNUNET_SCHEDULER_Priority p;
- GNUNET_SCHEDULER_TaskIdentifier min;
-
- if (id < lowest_pending_id)
- return GNUNET_NO;
- min = -1; /* maximum value */
- pos = pending;
- while (pos != NULL)
- {
- if (pos->id == id)
- return GNUNET_YES;
- if (pos->id < min)
- min = pos->id;
- pos = pos->next;
- }
- pos = pending_timeout;
- while (pos != NULL)
- {
- if (pos->id == id)
- return GNUNET_YES;
- if (pos->id < min)
- min = pos->id;
- pos = pos->next;
- }
- for (p = 0; p < GNUNET_SCHEDULER_PRIORITY_COUNT; p++)
- {
- pos = ready[p];
- while (pos != NULL)
- {
- if (pos->id == id)
- return GNUNET_YES;
- if (pos->id < min)
- min = pos->id;
- pos = pos->next;
- }
- }
- lowest_pending_id = min;
- return GNUNET_NO;
-}
-
-
/**
* Update all sets and timeout for select.
*
* @param ws write-set, set to all FDs we would like to write (updated)
* @param timeout next timeout (updated)
*/
+void getNextPendingTimeout(struct GNUNET_TIME_Relative *timeout)
+{
+
+ struct GNUNET_SCHEDULER_Task *pos;
+ struct GNUNET_TIME_Absolute now;
+ struct GNUNET_TIME_Relative to;
+
+ now = GNUNET_TIME_absolute_get ();
+ pos = pending_timeout_head;
+ if (NULL != pos)
+ {
+ to = GNUNET_TIME_absolute_get_difference (now, pos->timeout);
+ if (timeout->rel_value_us > to.rel_value_us)
+ *timeout = to;
+ if (0 != pos->reason)
+ *timeout = GNUNET_TIME_UNIT_ZERO;
+ }
+}
+
static void
update_sets (struct GNUNET_NETWORK_FDSet *rs,
struct GNUNET_NETWORK_FDSet *ws,
struct GNUNET_TIME_Relative *timeout)
{
- struct Task *pos;
+ struct GNUNET_SCHEDULER_Task *pos;
struct GNUNET_TIME_Absolute now;
struct GNUNET_TIME_Relative to;
now = GNUNET_TIME_absolute_get ();
- pos = pending_timeout;
- if (pos != NULL)
+
+ getNextPendingTimeout(timeout);
+ for (pos = pending_head; NULL != pos; pos = pos->next)
+ {
+ if (pos->timeout.abs_value_us != GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
{
to = GNUNET_TIME_absolute_get_difference (now, pos->timeout);
- if (timeout->rel_value > to.rel_value)
- *timeout = to;
- if (pos->reason != 0)
- *timeout = GNUNET_TIME_UNIT_ZERO;
- }
- pos = pending;
- while (pos != NULL)
- {
- if ((pos->prereq_id != GNUNET_SCHEDULER_NO_TASK) &&
- (GNUNET_YES == is_pending (pos->prereq_id)))
- {
- pos = pos->next;
- continue;
- }
- if (pos->timeout.abs_value != GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
- {
- to = GNUNET_TIME_absolute_get_difference (now, pos->timeout);
- if (timeout->rel_value > to.rel_value)
- *timeout = to;
- }
- if (pos->read_fd != -1)
- GNUNET_NETWORK_fdset_set_native (rs, pos->read_fd);
- if (pos->write_fd != -1)
- GNUNET_NETWORK_fdset_set_native (ws, pos->write_fd);
- if (pos->read_set != NULL)
- GNUNET_NETWORK_fdset_add (rs, pos->read_set);
- if (pos->write_set != NULL)
- GNUNET_NETWORK_fdset_add (ws, pos->write_set);
- if (pos->reason != 0)
- *timeout = GNUNET_TIME_UNIT_ZERO;
- pos = pos->next;
+ if (timeout->rel_value_us > to.rel_value_us)
+ *timeout = to;
}
+ if (-1 != pos->read_fd)
+ GNUNET_NETWORK_fdset_set_native (rs, pos->read_fd);
+ if (-1 != pos->write_fd)
+ GNUNET_NETWORK_fdset_set_native (ws, pos->write_fd);
+ if (NULL != pos->read_set)
+ GNUNET_NETWORK_fdset_add (rs, pos->read_set);
+ if (NULL != pos->write_set)
+ GNUNET_NETWORK_fdset_add (ws, pos->write_set);
+ if (0 != pos->reason)
+ *timeout = GNUNET_TIME_UNIT_ZERO;
+ }
}
/**
* Check if the ready set overlaps with the set we want to have ready.
* If so, update the want set (set all FDs that are ready). If not,
- * return GNUNET_NO.
+ * return #GNUNET_NO.
*
* @param ready set that is ready
* @param want set that we want to be ready
- * @return GNUNET_YES if there was some overlap
+ * @return #GNUNET_YES if there was some overlap
*/
static int
set_overlaps (const struct GNUNET_NETWORK_FDSet *ready,
struct GNUNET_NETWORK_FDSet *want)
{
- if ( (NULL == want) || (NULL == ready) )
+ if ((NULL == want) || (NULL == ready))
return GNUNET_NO;
if (GNUNET_NETWORK_fdset_overlap (ready, want))
- {
- /* copy all over (yes, there maybe unrelated bits,
- but this should not hurt well-written clients) */
- GNUNET_NETWORK_fdset_copy (want, ready);
- return GNUNET_YES;
- }
+ {
+ /* copy all over (yes, there maybe unrelated bits,
+ * but this should not hurt well-written clients) */
+ GNUNET_NETWORK_fdset_copy (want, ready);
+ return GNUNET_YES;
+ }
return GNUNET_NO;
}
* @param now the current time
* @param rs set of FDs ready for reading
* @param ws set of FDs ready for writing
- * @return GNUNET_YES if we can run it, GNUNET_NO if not.
+ * @return #GNUNET_YES if we can run it, #GNUNET_NO if not.
*/
static int
-is_ready (struct Task *task,
+is_ready (struct GNUNET_SCHEDULER_Task *task,
struct GNUNET_TIME_Absolute now,
const struct GNUNET_NETWORK_FDSet *rs,
const struct GNUNET_NETWORK_FDSet *ws)
enum GNUNET_SCHEDULER_Reason reason;
reason = task->reason;
- if (now.abs_value >= task->timeout.abs_value)
+ if (now.abs_value_us >= task->timeout.abs_value_us)
reason |= GNUNET_SCHEDULER_REASON_TIMEOUT;
- if ( (0 == (reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
- ( ( (task->read_fd != -1) &&
- (GNUNET_YES == GNUNET_NETWORK_fdset_test_native (rs, task->read_fd)) ) ||
- (set_overlaps (rs, task->read_set) ) ) )
+ if ((0 == (reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
+ (((task->read_fd != -1) &&
+ (GNUNET_YES == GNUNET_NETWORK_fdset_test_native (rs, task->read_fd))) ||
+ (set_overlaps (rs, task->read_set))))
reason |= GNUNET_SCHEDULER_REASON_READ_READY;
if ((0 == (reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) &&
- ( ( (task->write_fd != -1) &&
- (GNUNET_YES == GNUNET_NETWORK_fdset_test_native (ws, task->write_fd)) ) ||
- (set_overlaps (ws, task->write_set) ) ) )
+ (((task->write_fd != -1) &&
+ (GNUNET_YES == GNUNET_NETWORK_fdset_test_native (ws, task->write_fd)))
+ || (set_overlaps (ws, task->write_set))))
reason |= GNUNET_SCHEDULER_REASON_WRITE_READY;
- if (reason == 0)
- return GNUNET_NO; /* not ready */
- if (task->prereq_id != GNUNET_SCHEDULER_NO_TASK)
- {
- if (GNUNET_YES == is_pending (task->prereq_id))
- {
- task->reason = reason;
- return GNUNET_NO; /* prereq waiting */
- }
- reason |= GNUNET_SCHEDULER_REASON_PREREQ_DONE;
- }
+ if (0 == reason)
+ return GNUNET_NO; /* not ready */
+ reason |= GNUNET_SCHEDULER_REASON_PREREQ_DONE;
task->reason = reason;
return GNUNET_YES;
}
/**
* Put a task that is ready for execution into the ready queue.
*
- * @param handle the scheduler
* @param task task ready for execution
*/
static void
-queue_ready_task (struct Task *task)
+queue_ready_task (struct GNUNET_SCHEDULER_Task *task)
{
- enum GNUNET_SCHEDULER_Priority p = task->priority;
- if (0 != (task->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- p = GNUNET_SCHEDULER_PRIORITY_SHUTDOWN;
- task->next = ready[check_priority (p)];
- ready[check_priority (p)] = task;
+ enum GNUNET_SCHEDULER_Priority p = check_priority (task->priority);
+
+ GNUNET_CONTAINER_DLL_insert (ready_head[p],
+ ready_tail[p],
+ task);
+ task->in_ready_list = GNUNET_YES;
ready_count++;
}
* Check which tasks are ready and move them
* to the respective ready queue.
*
- * @param handle the scheduler
* @param rs FDs ready for reading
* @param ws FDs ready for writing
*/
check_ready (const struct GNUNET_NETWORK_FDSet *rs,
const struct GNUNET_NETWORK_FDSet *ws)
{
- struct Task *pos;
- struct Task *prev;
- struct Task *next;
+ struct GNUNET_SCHEDULER_Task *pos;
+ struct GNUNET_SCHEDULER_Task *next;
struct GNUNET_TIME_Absolute now;
now = GNUNET_TIME_absolute_get ();
- prev = NULL;
- pos = pending_timeout;
- while (pos != NULL)
+ while (NULL != (pos = pending_timeout_head))
+ {
+ if (now.abs_value_us >= pos->timeout.abs_value_us)
+ pos->reason |= GNUNET_SCHEDULER_REASON_TIMEOUT;
+ if (0 == pos->reason)
+ break;
+ GNUNET_CONTAINER_DLL_remove (pending_timeout_head,
+ pending_timeout_tail,
+ pos);
+ if (pending_timeout_last == pos)
+ pending_timeout_last = NULL;
+ queue_ready_task (pos);
+ }
+ pos = pending_head;
+ while (NULL != pos)
+ {
+ next = pos->next;
+ if (GNUNET_YES == is_ready (pos, now, rs, ws))
{
- next = pos->next;
- if (now.abs_value >= pos->timeout.abs_value)
- pos->reason |= GNUNET_SCHEDULER_REASON_TIMEOUT;
- if (0 == pos->reason)
- break;
- pending_timeout = next;
- if (pending_timeout_last == pos)
- pending_timeout_last = NULL;
+ GNUNET_CONTAINER_DLL_remove (pending_head,
+ pending_tail,
+ pos);
queue_ready_task (pos);
- pos = next;
- }
- pos = pending;
- while (pos != NULL)
- {
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Checking readiness of task: %llu / %p\n",
- pos->id, pos->callback_cls);
-#endif
- next = pos->next;
- if (GNUNET_YES == is_ready (pos, now, rs, ws))
- {
- if (prev == NULL)
- pending = next;
- else
- prev->next = next;
- queue_ready_task (pos);
- pos = next;
- continue;
- }
- prev = pos;
- pos = next;
}
+ pos = next;
+ }
}
/**
- * Request the shutdown of a scheduler. Marks all currently
- * pending tasks as ready because of shutdown. This will
- * cause all tasks to run (as soon as possible, respecting
- * priorities and prerequisite tasks). Note that tasks
- * scheduled AFTER this call may still be delayed arbitrarily.
+ * Request the shutdown of a scheduler. Marks all tasks
+ * awaiting shutdown as ready. Note that tasks
+ * scheduled with #GNUNET_SCHEDULER_add_shutdown() AFTER this call
+ * will be delayed until the next shutdown signal.
+ */
void
GNUNET_SCHEDULER_shutdown ()
{
- struct Task *pos;
- int i;
-
- pos = pending_timeout;
- while (pos != NULL)
- {
- pos->reason |= GNUNET_SCHEDULER_REASON_SHUTDOWN;
- /* we don't move the task into the ready queue yet; check_ready
- will do that later, possibly adding additional
- readiness-factors */
- pos = pos->next;
- }
- pos = pending;
- while (pos != NULL)
- {
- pos->reason |= GNUNET_SCHEDULER_REASON_SHUTDOWN;
- /* we don't move the task into the ready queue yet; check_ready
- will do that later, possibly adding additional
- readiness-factors */
- pos = pos->next;
- }
- for (i=0;i<GNUNET_SCHEDULER_PRIORITY_COUNT;i++)
- {
- pos = ready[i];
- while (pos != NULL)
- {
- pos->reason |= GNUNET_SCHEDULER_REASON_SHUTDOWN;
- /* we don't move the task into the ready queue yet; check_ready
- will do that later, possibly adding additional
- readiness-factors */
- pos = pos->next;
- }
- }
+ struct GNUNET_SCHEDULER_Task *pos;
+
+ while (NULL != (pos = shutdown_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (shutdown_head,
+ shutdown_tail,
+ pos);
+ pos->reason |= GNUNET_SCHEDULER_REASON_SHUTDOWN;
+ queue_ready_task (pos);
+ }
}
* @param t task to destroy
*/
static void
-destroy_task (struct Task *t)
+destroy_task (struct GNUNET_SCHEDULER_Task *t)
{
if (NULL != t->read_set)
GNUNET_NETWORK_fdset_destroy (t->read_set);
}
+/**
+ * Output stack trace of task @a t.
+ *
+ * @param t task to dump stack trace of
+ */
+static void
+dump_backtrace (struct GNUNET_SCHEDULER_Task *t)
+{
+#if EXECINFO
+ unsigned int i;
+
+ for (i = 0; i < t->num_backtrace_strings; i++)
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Task %p trace %u: %s\n",
+ t,
+ i,
+ t->backtrace_strings[i]);
+#endif
+}
+
+
/**
* Run at least one task in the highest-priority queue that is not
* empty. Keep running tasks until we are either no longer running
* "URGENT" tasks or until we have at least one "pending" task (which
* may become ready, hence we should select on it). Naturally, if
- * there are no more ready tasks, we also return.
+ * there are no more ready tasks, we also return.
*
* @param rs FDs ready for reading
* @param ws FDs ready for writing
*/
static void
run_ready (struct GNUNET_NETWORK_FDSet *rs,
- struct GNUNET_NETWORK_FDSet *ws)
+ struct GNUNET_NETWORK_FDSet *ws)
{
enum GNUNET_SCHEDULER_Priority p;
- struct Task *pos;
- struct GNUNET_SCHEDULER_TaskContext tc;
+ struct GNUNET_SCHEDULER_Task *pos;
max_priority_added = GNUNET_SCHEDULER_PRIORITY_KEEP;
do
+ {
+ if (0 == ready_count)
+ return;
+ GNUNET_assert (NULL == ready_head[GNUNET_SCHEDULER_PRIORITY_KEEP]);
+ /* yes, p>0 is correct, 0 is "KEEP" which should
+ * always be an empty queue (see assertion)! */
+ for (p = GNUNET_SCHEDULER_PRIORITY_COUNT - 1; p > 0; p--)
{
- if (ready_count == 0)
- return;
- GNUNET_assert (ready[GNUNET_SCHEDULER_PRIORITY_KEEP] == NULL);
- /* yes, p>0 is correct, 0 is "KEEP" which should
- always be an empty queue (see assertion)! */
- for (p = GNUNET_SCHEDULER_PRIORITY_COUNT - 1; p > 0; p--)
- {
- pos = ready[p];
- if (pos != NULL)
- break;
- }
- GNUNET_assert (pos != NULL); /* ready_count wrong? */
- ready[p] = pos->next;
- ready_count--;
- if (current_priority != pos->priority)
- {
- current_priority = pos->priority;
- (void) GNUNET_OS_set_process_priority (GNUNET_OS_process_current (), pos->priority);
- }
- active_task = pos;
+ pos = ready_head[p];
+ if (NULL != pos)
+ break;
+ }
+ GNUNET_assert (NULL != pos); /* ready_count wrong? */
+ GNUNET_CONTAINER_DLL_remove (ready_head[p],
+ ready_tail[p],
+ pos);
+ ready_count--;
+ current_priority = pos->priority;
+ current_lifeness = pos->lifeness;
+ active_task = pos;
#if PROFILE_DELAYS
- if (GNUNET_TIME_absolute_get_duration (pos->start_time).rel_value >
- DELAY_THRESHOLD.rel_value)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Task %llu took %llums to be scheduled\n",
- pos->id,
- (unsigned long long) GNUNET_TIME_absolute_get_duration (pos->start_time).rel_value);
- }
-#endif
- tc.reason = pos->reason;
- tc.read_ready = (pos->read_set == NULL) ? rs : pos->read_set;
- if ( (pos->read_fd != -1) &&
- (0 != (pos->reason & GNUNET_SCHEDULER_REASON_READ_READY)) )
- GNUNET_NETWORK_fdset_set_native (rs,
- pos->read_fd);
- tc.write_ready = (pos->write_set == NULL) ? ws : pos->write_set;
- if ( (pos->write_fd != -1) &&
- (0 != (pos->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) )
- GNUNET_NETWORK_fdset_set_native (ws,
- pos->write_fd);
- if ( ( (tc.reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0) &&
- (pos->write_fd != -1) &&
- (! GNUNET_NETWORK_fdset_test_native (ws,
- pos->write_fd)))
- abort (); // added to ready in previous select loop!
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Running task: %llu / %p\n", pos->id, pos->callback_cls);
-#endif
- pos->callback (pos->callback_cls, &tc);
-#if EXECINFO
- int i;
- for (i=0;i<pos->num_backtrace_strings;i++)
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Task %llu trace %d: %s\n",
- pos->id,
- i,
- pos->backtrace_strings[i]);
-#endif
- active_task = NULL;
- destroy_task (pos);
- tasks_run++;
+ if (GNUNET_TIME_absolute_get_duration (pos->start_time).rel_value_us >
+ DELAY_THRESHOLD.rel_value_us)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Task %p took %s to be scheduled\n",
+ pos,
+ GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (pos->start_time),
+ GNUNET_YES));
}
- while ( (pending == NULL) || (p >= max_priority_added) );
+#endif
+ tc.reason = pos->reason;
+ tc.read_ready = (NULL == pos->read_set) ? rs : pos->read_set;
+ if ((-1 != pos->read_fd) &&
+ (0 != (pos->reason & GNUNET_SCHEDULER_REASON_READ_READY)))
+ GNUNET_NETWORK_fdset_set_native (rs, pos->read_fd);
+ tc.write_ready = (NULL == pos->write_set) ? ws : pos->write_set;
+ if ((-1 != pos->write_fd) &&
+ (0 != (pos->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)))
+ GNUNET_NETWORK_fdset_set_native (ws, pos->write_fd);
+ if ((0 != (tc.reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) &&
+ (-1 != pos->write_fd) &&
+ (!GNUNET_NETWORK_fdset_test_native (ws, pos->write_fd)))
+ GNUNET_assert (0); // added to ready in previous select loop!
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Running task: %p\n",
+ pos);
+ pos->callback (pos->callback_cls);
+ dump_backtrace (pos);
+ active_task = NULL;
+ destroy_task (pos);
+ tasks_run++;
+ }
+ while ((NULL == pending_head) || (p >= max_priority_added));
}
+
/**
* Pipe used to communicate shutdown via signal.
*/
static struct GNUNET_DISK_PipeHandle *shutdown_pipe_handle;
+/**
+ * Process ID of this process at the time we installed the various
+ * signal handlers.
+ */
+static pid_t my_pid;
+
/**
* Signal handler called for SIGPIPE.
*/
return;
}
#endif
+
+
+/**
+ * Wait for a short time.
+ * Sleeps for @a ms ms (as that should be long enough for virtually all
+ * modern systems to context switch and allow another process to do
+ * some 'real' work).
+ *
+ * @param ms how many ms to wait
+ */
+static void
+short_wait (unsigned int ms)
+{
+ struct GNUNET_TIME_Relative timeout;
+
+ timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, ms);
+ (void) GNUNET_NETWORK_socket_select (NULL, NULL, NULL, timeout);
+}
+
+
/**
* Signal handler called for signals that should cause us to shutdown.
*/
sighandler_shutdown ()
{
static char c;
- int old_errno = errno; /* backup errno */
+ int old_errno = errno; /* backup errno */
+ if (getpid () != my_pid)
+ exit (1); /* we have fork'ed since the signal handler was created,
+ * ignore the signal, see https://gnunet.org/vfork discussion */
GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
- (shutdown_pipe_handle, GNUNET_DISK_PIPE_END_WRITE), &c,
- sizeof (c));
+ (shutdown_pipe_handle, GNUNET_DISK_PIPE_END_WRITE),
+ &c, sizeof (c));
errno = old_errno;
}
+/**
+ * Check if the system is still alive. Trigger shutdown if we
+ * have tasks, but none of them give us lifeness.
+ *
+ * @return #GNUNET_OK to continue the main loop,
+ * #GNUNET_NO to exit
+ */
+static int
+check_lifeness ()
+{
+ struct GNUNET_SCHEDULER_Task *t;
+
+ if (ready_count > 0)
+ return GNUNET_OK;
+ for (t = pending_head; NULL != t; t = t->next)
+ if (t->lifeness == GNUNET_YES)
+ return GNUNET_OK;
+ for (t = shutdown_head; NULL != t; t = t->next)
+ if (t->lifeness == GNUNET_YES)
+ return GNUNET_OK;
+ for (t = pending_timeout_head; NULL != t; t = t->next)
+ if (t->lifeness == GNUNET_YES)
+ return GNUNET_OK;
+ if (NULL != shutdown_head)
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return GNUNET_OK;
+ }
+ return GNUNET_NO;
+}
+
+
+
+void while_live(struct GNUNET_NETWORK_FDSet *rs, struct GNUNET_NETWORK_FDSet *ws)
+{
+ int ret;
+ unsigned int busy_wait_warning;
+ unsigned long long last_tr;
+ const struct GNUNET_DISK_FileHandle *pr;
+ char c;
+ struct GNUNET_TIME_Relative timeout;
+
+ busy_wait_warning = 0;
+ pr = GNUNET_DISK_pipe_handle (shutdown_pipe_handle,
+ GNUNET_DISK_PIPE_END_READ);
+ GNUNET_assert (NULL != pr);
+ last_tr = 0;
+
+ while (GNUNET_OK == check_lifeness ())
+ {
+ GNUNET_NETWORK_fdset_zero (rs);
+ GNUNET_NETWORK_fdset_zero (ws);
+ timeout = GNUNET_TIME_UNIT_FOREVER_REL;
+ update_sets (rs, ws, &timeout);
+ GNUNET_NETWORK_fdset_handle_set (rs, pr);
+ if (ready_count > 0)
+ {
+ /* no blocking, more work already ready! */
+ timeout = GNUNET_TIME_UNIT_ZERO;
+ }
+ if (NULL == scheduler_select)
+ ret = GNUNET_NETWORK_socket_select (rs,
+ ws,
+ NULL,
+ timeout);
+ else
+ ret = scheduler_select (scheduler_select_cls,
+ rs,
+ ws,
+ NULL,
+ timeout);
+ if (ret == GNUNET_SYSERR)
+ {
+ if (errno == EINTR)
+ continue;
+
+ LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "select");
+#ifndef MINGW
+#if USE_LSOF
+ char lsof[512];
+
+ snprintf (lsof, sizeof (lsof), "lsof -p %d", getpid ());
+ (void) close (1);
+ (void) dup2 (2, 1);
+ if (0 != system (lsof))
+ LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING,
+ "system");
+#endif
+#endif
+#if DEBUG_FDS
+ struct GNUNET_SCHEDULER_Task *t;
+
+ for (t = pending_head; NULL != t; t = t->next)
+ {
+ if (-1 != t->read_fd)
+ {
+ int flags = fcntl (t->read_fd, F_GETFD);
+ if ((flags == -1) && (errno == EBADF))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "Got invalid file descriptor %d!\n",
+ t->read_fd);
+ dump_backtrace (t);
+ }
+ }
+ if (-1 != t->write_fd)
+ {
+ int flags = fcntl (t->write_fd, F_GETFD);
+ if ((flags == -1) && (errno == EBADF))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "Got invalid file descriptor %d!\n",
+ t->write_fd);
+ dump_backtrace (t);
+ }
+ }
+ }
+#endif
+ GNUNET_assert (0);
+ break;
+ }
+
+ if ( (0 == ret) &&
+ (0 == timeout.rel_value_us) &&
+ (busy_wait_warning > 16) )
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "Looks like we're busy waiting...\n");
+ short_wait (100); /* mitigate */
+ }
+ check_ready (rs, ws);
+ run_ready (rs, ws);
+ if (GNUNET_NETWORK_fdset_handle_isset (rs, pr))
+ {
+ /* consume the signal */
+ GNUNET_DISK_file_read (pr, &c, sizeof (c));
+ /* mark all active tasks as ready due to shutdown */
+ GNUNET_SCHEDULER_shutdown ();
+ }
+ if (last_tr == tasks_run)
+ {
+ short_wait (1);
+ busy_wait_warning++;
+ }
+ else
+ {
+ last_tr = tasks_run;
+ busy_wait_warning = 0;
+ }
+ }
+}
+
/**
* Initialize and run scheduler. This function will return when all
* tasks have completed. On systems with signals, receiving a SIGTERM
- * (and other similar signals) will cause "GNUNET_SCHEDULER_shutdown"
+ * (and other similar signals) will cause #GNUNET_SCHEDULER_shutdown()
* to be run after the active task is complete. As a result, SIGTERM
* causes all active tasks to be scheduled with reason
- * "GNUNET_SCHEDULER_REASON_SHUTDOWN". (However, tasks added
+ * #GNUNET_SCHEDULER_REASON_SHUTDOWN. (However, tasks added
* afterwards will execute normally!). Note that any particular signal
* will only shut down one scheduler; applications should always only
* create a single scheduler.
*
* @param task task to run immediately
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
*/
void
-GNUNET_SCHEDULER_run (GNUNET_SCHEDULER_Task task, void *task_cls)
+GNUNET_SCHEDULER_run (GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
struct GNUNET_NETWORK_FDSet *rs;
struct GNUNET_NETWORK_FDSet *ws;
- struct GNUNET_TIME_Relative timeout;
- int ret;
+
+
struct GNUNET_SIGNAL_Context *shc_int;
struct GNUNET_SIGNAL_Context *shc_term;
+#if (SIGTERM != GNUNET_TERM_SIG)
+ struct GNUNET_SIGNAL_Context *shc_gterm;
+#endif
+
#ifndef MINGW
struct GNUNET_SIGNAL_Context *shc_quit;
struct GNUNET_SIGNAL_Context *shc_hup;
struct GNUNET_SIGNAL_Context *shc_pipe;
#endif
- unsigned long long last_tr;
- unsigned int busy_wait_warning;
- const struct GNUNET_DISK_FileHandle *pr;
- char c;
- GNUNET_assert (active_task == NULL);
+
+
+ GNUNET_assert (NULL == active_task);
rs = GNUNET_NETWORK_fdset_create ();
ws = GNUNET_NETWORK_fdset_create ();
- GNUNET_assert (shutdown_pipe_handle == NULL);
- shutdown_pipe_handle = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO, GNUNET_NO);
- GNUNET_assert (shutdown_pipe_handle != NULL);
- pr = GNUNET_DISK_pipe_handle (shutdown_pipe_handle, GNUNET_DISK_PIPE_END_READ);
- GNUNET_assert (pr != NULL);
- shc_int = GNUNET_SIGNAL_handler_install (SIGINT, &sighandler_shutdown);
- shc_term = GNUNET_SIGNAL_handler_install (SIGTERM, &sighandler_shutdown);
+ GNUNET_assert (NULL == shutdown_pipe_handle);
+ shutdown_pipe_handle = GNUNET_DISK_pipe (GNUNET_NO,
+ GNUNET_NO,
+ GNUNET_NO,
+ GNUNET_NO);
+ GNUNET_assert (NULL != shutdown_pipe_handle);
+
+ my_pid = getpid ();
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Registering signal handlers\n");
+ shc_int = GNUNET_SIGNAL_handler_install (SIGINT,
+ &sighandler_shutdown);
+ shc_term = GNUNET_SIGNAL_handler_install (SIGTERM,
+ &sighandler_shutdown);
+#if (SIGTERM != GNUNET_TERM_SIG)
+ shc_gterm = GNUNET_SIGNAL_handler_install (GNUNET_TERM_SIG,
+ &sighandler_shutdown);
+#endif
#ifndef MINGW
- shc_pipe = GNUNET_SIGNAL_handler_install (SIGPIPE, &sighandler_pipe);
- shc_quit = GNUNET_SIGNAL_handler_install (SIGQUIT, &sighandler_shutdown);
- shc_hup = GNUNET_SIGNAL_handler_install (SIGHUP, &sighandler_shutdown);
+ shc_pipe = GNUNET_SIGNAL_handler_install (SIGPIPE,
+ &sighandler_pipe);
+ shc_quit = GNUNET_SIGNAL_handler_install (SIGQUIT,
+ &sighandler_shutdown);
+ shc_hup = GNUNET_SIGNAL_handler_install (SIGHUP,
+ &sighandler_shutdown);
#endif
current_priority = GNUNET_SCHEDULER_PRIORITY_DEFAULT;
- GNUNET_SCHEDULER_add_continuation (task,
- task_cls,
- GNUNET_SCHEDULER_REASON_STARTUP);
- last_tr = 0;
- busy_wait_warning = 0;
- while ((pending != NULL) ||
- (pending_timeout != NULL) ||
- (ready_count > 0))
- {
- GNUNET_NETWORK_fdset_zero (rs);
- GNUNET_NETWORK_fdset_zero (ws);
- timeout = GNUNET_TIME_UNIT_FOREVER_REL;
- update_sets (rs, ws, &timeout);
- GNUNET_NETWORK_fdset_handle_set (rs, pr);
- if (ready_count > 0)
- {
- /* no blocking, more work already ready! */
- timeout = GNUNET_TIME_UNIT_ZERO;
- }
- ret = GNUNET_NETWORK_socket_select (rs, ws, NULL, timeout);
- if (ret == GNUNET_SYSERR)
- {
- if (errno == EINTR)
- continue;
-
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "select");
-#ifndef MINGW
-#if USE_LSOF
- char lsof[512];
- snprintf (lsof, sizeof (lsof), "lsof -p %d", getpid());
- close (1);
- dup2 (2, 1);
- system (lsof);
+ current_lifeness = GNUNET_YES;
+ GNUNET_SCHEDULER_add_with_reason_and_priority (task,
+ task_cls,
+ GNUNET_SCHEDULER_REASON_STARTUP,
+ GNUNET_SCHEDULER_PRIORITY_DEFAULT);
+ active_task = (void *) (long) -1; /* force passing of sanity check */
+ GNUNET_SCHEDULER_add_now_with_lifeness (GNUNET_NO,
+ &GNUNET_OS_install_parent_control_handler,
+ NULL);
+ active_task = NULL;
+
+
+ while_live(rs, ws);
+ GNUNET_SIGNAL_handler_uninstall (shc_int);
+ GNUNET_SIGNAL_handler_uninstall (shc_term);
+#if (SIGTERM != GNUNET_TERM_SIG)
+ GNUNET_SIGNAL_handler_uninstall (shc_gterm);
#endif
-#endif
- abort ();
- break;
- }
- if ((ret == 0) && (timeout.rel_value == 0) && (busy_wait_warning > 16))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Looks like we're busy waiting...\n"));
- sleep (1); /* mitigate */
- }
- check_ready (rs, ws);
- run_ready (rs, ws);
- if (GNUNET_NETWORK_fdset_handle_isset (rs, pr))
- {
- /* consume the signal */
- GNUNET_DISK_file_read (pr, &c, sizeof (c));
- /* mark all active tasks as ready due to shutdown */
- GNUNET_SCHEDULER_shutdown ();
- }
- if (last_tr == tasks_run)
- {
- busy_wait_warning++;
- }
- else
- {
- last_tr = tasks_run;
- busy_wait_warning = 0;
- }
- }
- GNUNET_SIGNAL_handler_uninstall (shc_int);
- GNUNET_SIGNAL_handler_uninstall (shc_term);
#ifndef MINGW
GNUNET_SIGNAL_handler_uninstall (shc_pipe);
GNUNET_SIGNAL_handler_uninstall (shc_quit);
/**
- * Obtain the reason code for why the current task was
- * started. Will return the same value as
- * the GNUNET_SCHEDULER_TaskContext's reason field.
+ * Obtain the task context, giving the reason why the current task was
+ * started.
*
- * @return reason(s) why the current task is run
+ * @return current tasks' scheduler context
*/
-enum GNUNET_SCHEDULER_Reason
-GNUNET_SCHEDULER_get_reason ()
+const struct GNUNET_SCHEDULER_TaskContext *
+GNUNET_SCHEDULER_get_task_context ()
{
- GNUNET_assert (active_task != NULL);
- return active_task->reason;
+ GNUNET_assert (NULL != active_task);
+ return &tc;
}
unsigned int
GNUNET_SCHEDULER_get_load (enum GNUNET_SCHEDULER_Priority p)
{
- struct Task *pos;
+ struct GNUNET_SCHEDULER_Task *pos;
unsigned int ret;
- GNUNET_assert (active_task != NULL);
+ GNUNET_assert (NULL != active_task);
if (p == GNUNET_SCHEDULER_PRIORITY_COUNT)
return ready_count;
if (p == GNUNET_SCHEDULER_PRIORITY_KEEP)
p = current_priority;
ret = 0;
- pos = ready[check_priority (p)];
- while (pos != NULL)
- {
- pos = pos->next;
- ret++;
- }
+ for (pos = ready_head[check_priority (p)]; NULL != pos; pos = pos->next)
+ ret++;
return ret;
}
+static struct GNUNET_SCHEDULER_Task*
+initFdInfo(const struct GNUNET_NETWORK_Handle *read_nh,
+ const struct GNUNET_NETWORK_Handle *write_nh,
+ const struct GNUNET_DISK_FileHandle *read_fh,
+ const struct GNUNET_DISK_FileHandle *write_fh)
+{
+
+
+ struct GNUNET_SCHEDULER_Task *t;
+
+ t = GNUNET_new (struct GNUNET_SCHEDULER_Task);
+
+ // either only network handles or only file handles are allowed
+ GNUNET_assert (!((NULL != read_nh || NULL != write_nh) && (NULL != read_fh || NULL != write_fh)));
+
+ if (NULL != read_nh && NULL != write_nh)
+ {
+ t->fds_len = 2;
+ t->fds = GNUNET_new_array (2, struct GNUNET_SCHEDULER_FdInfo);
+ const struct GNUNET_SCHEDULER_FdInfo read_fdi = { .fd = read_nh, .et = GNUNET_SCHEDULER_ET_IN, .sock = GNUNET_NETWORK_get_fd (read_nh)};
+ const struct GNUNET_SCHEDULER_FdInfo write_fdi = { .fd = write_nh, .et = GNUNET_SCHEDULER_ET_OUT, .sock = GNUNET_NETWORK_get_fd (write_nh)};
+
+ const struct GNUNET_SCHEDULER_FdInfo array[2] = {read_fdi, write_fdi};
+ t->fds = array;
+ }
+ else if (NULL != read_fh && NULL != write_fh)
+ {
+ t->fds_len = 2;
+ t->fds = GNUNET_new_array (2, struct GNUNET_SCHEDULER_FdInfo);
+ const struct GNUNET_SCHEDULER_FdInfo read_fdi = { .fh = read_fh, .et = GNUNET_SCHEDULER_ET_IN};
+ const struct GNUNET_SCHEDULER_FdInfo write_fdi = { .fh = write_fh, .et = GNUNET_SCHEDULER_ET_OUT, .sock = GNUNET_NETWORK_get_fd (write_nh)};
+ const struct GNUNET_SCHEDULER_FdInfo array[2] = {read_fdi, write_fdi};
+ t->fds = array;
+ }
+ else if (NULL != read_nh)
+ {
+ struct GNUNET_SCHEDULER_FdInfo read_fdi = { .fd = read_nh, .et = GNUNET_SCHEDULER_ET_IN, .sock = GNUNET_NETWORK_get_fd (read_nh)};
+ t->fdx = read_fdi;
+ }
+ else if (NULL != write_nh)
+ {
+ struct GNUNET_SCHEDULER_FdInfo write_fdi = { .fd = write_nh, .et = GNUNET_SCHEDULER_ET_OUT, .sock = GNUNET_NETWORK_get_fd (write_nh)};
+ t->fdx = write_fdi;
+ }
+ else if (NULL != read_fh)
+ {
+ struct GNUNET_SCHEDULER_FdInfo read_fdi = { .fh = read_fh, .et = GNUNET_SCHEDULER_ET_IN};
+ t->fdx = read_fdi;
+ }
+ else if (NULL != write_fh)
+ {
+ struct GNUNET_SCHEDULER_FdInfo write_fdi = { .fh = write_fh, .et = GNUNET_SCHEDULER_ET_OUT, .sock = GNUNET_NETWORK_get_fd (write_nh)};
+ t->fdx = write_fdi;
+ }
+}
/**
* Cancel the task with the specified identifier.
* @return original closure of the task
*/
void *
-GNUNET_SCHEDULER_cancel (GNUNET_SCHEDULER_TaskIdentifier task)
+GNUNET_SCHEDULER_cancel (struct GNUNET_SCHEDULER_Task *task)
{
- struct Task *t;
- struct Task *prev;
enum GNUNET_SCHEDULER_Priority p;
- int to;
void *ret;
- GNUNET_assert (active_task != NULL);
- to = 0;
- prev = NULL;
- t = pending;
- while (t != NULL)
- {
- if (t->id == task)
- break;
- prev = t;
- t = t->next;
- }
- if (t == NULL)
- {
- prev = NULL;
- to = 1;
- t = pending_timeout;
- while (t != NULL)
- {
- if (t->id == task)
- break;
- prev = t;
- t = t->next;
- }
- if (pending_timeout_last == t)
- pending_timeout_last = NULL;
- }
- p = 0;
- while (t == NULL)
+ GNUNET_assert ( (NULL != active_task) ||
+ (GNUNET_NO == task->lifeness) );
+ if (! task->in_ready_list)
+ {
+ if ( (-1 == task->read_fd) &&
+ (-1 == task->write_fd) &&
+ (NULL == task->read_set) &&
+ (NULL == task->write_set) )
{
- p++;
- GNUNET_assert (p < GNUNET_SCHEDULER_PRIORITY_COUNT);
- prev = NULL;
- t = ready[p];
- while (t != NULL)
- {
- if (t->id == task)
- {
- ready_count--;
- break;
- }
- prev = t;
- t = t->next;
- }
- }
- if (prev == NULL)
- {
- if (p == 0)
- {
- if (to == 0)
- {
- pending = t->next;
- }
- else
- {
- pending_timeout = t->next;
- }
- }
+ if (GNUNET_YES == task->on_shutdown)
+ GNUNET_CONTAINER_DLL_remove (shutdown_head,
+ shutdown_tail,
+ task);
else
- {
- ready[p] = t->next;
- }
+ GNUNET_CONTAINER_DLL_remove (pending_timeout_head,
+ pending_timeout_tail,
+ task);
+ if (task == pending_timeout_last)
+ pending_timeout_last = NULL;
}
- else
+ else
{
- prev->next = t->next;
+ scheduler_multi_function_call(task, scheduler_driver->del);
}
- ret = t->callback_cls;
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Canceling task: %llu / %p\n", task, t->callback_cls);
-#endif
- destroy_task (t);
+ }
+ else
+ {
+ p = check_priority (task->priority);
+ GNUNET_CONTAINER_DLL_remove (ready_head[p],
+ ready_tail[p],
+ task);
+ ready_count--;
+ }
+ ret = task->callback_cls;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Canceling task %p\n",
+ task);
+ destroy_task (task);
return ret;
}
+/**
+ * Initialize backtrace data for task @a t
+ *
+ * @param t task to initialize
+ */
+static void
+init_backtrace (struct GNUNET_SCHEDULER_Task *t)
+{
+#if EXECINFO
+ void *backtrace_array[MAX_TRACE_DEPTH];
+
+ t->num_backtrace_strings
+ = backtrace (backtrace_array, MAX_TRACE_DEPTH);
+ t->backtrace_strings =
+ backtrace_symbols (backtrace_array,
+ t->num_backtrace_strings);
+ dump_backtrace (t);
+#endif
+}
+
+
/**
* Continue the current execution with the given function. This is
* similar to the other "add" functions except that there is no delay
* and the reason code can be specified.
*
* @param task main function of the task
- * @param task_cls closure for 'main'
+ * @param task_cls closure for @a task
* @param reason reason for task invocation
+ * @param priority priority to use for the task
*/
void
-GNUNET_SCHEDULER_add_continuation (GNUNET_SCHEDULER_Task task,
- void *task_cls,
- enum GNUNET_SCHEDULER_Reason reason)
+GNUNET_SCHEDULER_add_with_reason_and_priority (GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls,
+ enum GNUNET_SCHEDULER_Reason reason,
+ enum GNUNET_SCHEDULER_Priority priority)
{
- struct Task *t;
-#if EXECINFO
- void *backtrace_array[50];
-#endif
+ struct GNUNET_SCHEDULER_Task *t;
- GNUNET_assert ( (active_task != NULL) ||
- (reason == GNUNET_SCHEDULER_REASON_STARTUP) );
- t = GNUNET_malloc (sizeof (struct Task));
-#if EXECINFO
- t->num_backtrace_strings = backtrace(backtrace_array, 50);
- t->backtrace_strings = backtrace_symbols(backtrace_array, t->num_backtrace_strings);
-#endif
+ GNUNET_assert (NULL != task);
+ GNUNET_assert ((NULL != active_task) ||
+ (GNUNET_SCHEDULER_REASON_STARTUP == reason));
+ t = GNUNET_new (struct GNUNET_SCHEDULER_Task);
t->read_fd = -1;
t->write_fd = -1;
t->callback = task;
t->callback_cls = task_cls;
- t->id = ++last_id;
#if PROFILE_DELAYS
t->start_time = GNUNET_TIME_absolute_get ();
#endif
t->reason = reason;
- t->priority = current_priority;
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding continuation task: %llu / %p\n",
- t->id, t->callback_cls);
-#endif
+ t->priority = priority;
+ t->lifeness = current_lifeness;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding continuation task %p\n",
+ t);
+ init_backtrace (t);
queue_ready_task (t);
}
+/**
+ * Schedule a new task to be run at the specified time. The task
+ * will be scheduled for execution at time @a at.
+ *
+ * @param at time when the operation should run
+ * @param priority priority to use for the task
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_at_with_priority (struct GNUNET_TIME_Absolute at,
+ enum GNUNET_SCHEDULER_Priority priority,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
+{
+ struct GNUNET_SCHEDULER_Task *t;
+ struct GNUNET_SCHEDULER_Task *pos;
+ struct GNUNET_SCHEDULER_Task *prev;
+
+ GNUNET_assert (NULL != active_task);
+ GNUNET_assert (NULL != task);
+ t = GNUNET_new (struct GNUNET_SCHEDULER_Task);
+ t->callback = task;
+ t->callback_cls = task_cls;
+ t->read_fd = -1;
+ t->write_fd = -1;
+#if PROFILE_DELAYS
+ t->start_time = GNUNET_TIME_absolute_get ();
+#endif
+ t->timeout = at;
+ t->priority = priority;
+ t->lifeness = current_lifeness;
+ /* try tail first (optimization in case we are
+ * appending to a long list of tasks with timeouts) */
+ if ( (NULL == pending_timeout_head) ||
+ (at.abs_value_us < pending_timeout_head->timeout.abs_value_us) )
+ {
+ GNUNET_CONTAINER_DLL_insert (pending_timeout_head,
+ pending_timeout_tail,
+ t);
+ }
+ else
+ {
+ /* first move from heuristic start backwards to before start time */
+ prev = pending_timeout_last;
+ while ( (NULL != prev) &&
+ (prev->timeout.abs_value_us > t->timeout.abs_value_us) )
+ prev = prev->prev;
+ /* now, move from heuristic start (or head of list) forward to insertion point */
+ if (NULL == prev)
+ pos = pending_timeout_head;
+ else
+ pos = prev->next;
+ while ( (NULL != pos) &&
+ ( (pos->timeout.abs_value_us <= t->timeout.abs_value_us) ||
+ (0 != pos->reason) ) )
+ {
+ prev = pos;
+ pos = pos->next;
+ }
+ GNUNET_CONTAINER_DLL_insert_after (pending_timeout_head,
+ pending_timeout_tail,
+ prev,
+ t);
+ }
+ /* finally, update heuristic insertion point to last insertion... */
+ pending_timeout_last = t;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding task: %p\n",
+ t);
+ init_backtrace (t);
+ return t;
+}
+
/**
- * Schedule a new task to be run after the specified prerequisite task
- * has completed. It will be run with the priority of the calling
- * task.
+ * Schedule a new task to be run with a specified delay. The task
+ * will be scheduled for execution once the delay has expired.
*
- * @param prerequisite_task run this task after the task with the given
- * task identifier completes (and any of our other
- * conditions, such as delay, read or write-readiness
- * are satisfied). Use GNUNET_SCHEDULER_NO_TASK to not have any dependency
- * on completion of other tasks (this will cause the task to run as
- * soon as possible).
+ * @param delay when should this operation time out?
+ * @param priority priority to use for the task
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
-GNUNET_SCHEDULER_add_after (GNUNET_SCHEDULER_TaskIdentifier prerequisite_task,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_delayed_with_priority (struct GNUNET_TIME_Relative delay,
+ enum GNUNET_SCHEDULER_Priority priority,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
- return GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_KEEP,
- prerequisite_task,
- GNUNET_TIME_UNIT_ZERO,
- NULL, NULL, task, task_cls);
+ return GNUNET_SCHEDULER_add_at_with_priority (GNUNET_TIME_relative_to_absolute (delay),
+ priority,
+ task,
+ task_cls);
}
*
* @param prio how important is the new task?
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+struct GNUNET_SCHEDULER_Task *
GNUNET_SCHEDULER_add_with_priority (enum GNUNET_SCHEDULER_Priority prio,
- GNUNET_SCHEDULER_Task task,
+ GNUNET_SCHEDULER_TaskCallback task,
void *task_cls)
{
- return GNUNET_SCHEDULER_add_select (prio,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_ZERO,
- NULL, NULL, task, task_cls);
+ return GNUNET_SCHEDULER_add_delayed_with_priority (GNUNET_TIME_UNIT_ZERO,
+ prio,
+ task,
+ task_cls);
}
+/**
+ * Schedule a new task to be run at the specified time. The task
+ * will be scheduled for execution once specified time has been
+ * reached. It will be run with the DEFAULT priority.
+ *
+ * @param at time at which this operation should run
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_at (struct GNUNET_TIME_Absolute at,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
+{
+ return GNUNET_SCHEDULER_add_at_with_priority (at,
+ GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ task,
+ task_cls);
+}
+
/**
* Schedule a new task to be run with a specified delay. The task
* will be scheduled for execution once the delay has expired. It
- * will be run with the priority of the calling task.
+ * will be run with the DEFAULT priority.
*
- * @param delay when should this operation time out? Use
- * GNUNET_TIME_UNIT_FOREVER_REL for "on shutdown"
+ * @param delay when should this operation time out?
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+struct GNUNET_SCHEDULER_Task *
GNUNET_SCHEDULER_add_delayed (struct GNUNET_TIME_Relative delay,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
-#if 1
- /* new, optimized version */
- struct Task *t;
- struct Task *pos;
- struct Task *prev;
-#if EXECINFO
- void *backtrace_array[MAX_TRACE_DEPTH];
-#endif
+ return GNUNET_SCHEDULER_add_delayed_with_priority (delay,
+ GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ task,
+ task_cls);
+}
+
+
+/**
+ * Schedule a new task to be run as soon as possible. Note that this
+ * does not guarantee that this will be the next task that is being
+ * run, as other tasks with higher priority (or that are already ready
+ * to run) might get to run first. Just as with delays, clients must
+ * not rely on any particular order of execution between tasks
+ * scheduled concurrently.
+ *
+ * The task will be run with the DEFAULT priority.
+ *
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_now (GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
+{
+ return GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_ZERO,
+ task,
+ task_cls);
+}
+
+
+/**
+ * Schedule a new task to be run on shutdown, that is when a CTRL-C
+ * signal is received, or when #GNUNET_SCHEDULER_shutdown() is being
+ * invoked.
+ *
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_shutdown (GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
+{
+ struct GNUNET_SCHEDULER_Task *t;
- GNUNET_assert (active_task != NULL);
+ GNUNET_assert (NULL != active_task);
GNUNET_assert (NULL != task);
- t = GNUNET_malloc (sizeof (struct Task));
+ t = GNUNET_new (struct GNUNET_SCHEDULER_Task);
t->callback = task;
t->callback_cls = task_cls;
-#if EXECINFO
- t->num_backtrace_strings = backtrace(backtrace_array, MAX_TRACE_DEPTH);
- t->backtrace_strings = backtrace_symbols(backtrace_array, t->num_backtrace_strings);
-#endif
t->read_fd = -1;
t->write_fd = -1;
- t->id = ++last_id;
#if PROFILE_DELAYS
t->start_time = GNUNET_TIME_absolute_get ();
#endif
- t->timeout = GNUNET_TIME_relative_to_absolute (delay);
- t->priority = current_priority;
- /* try tail first (optimization in case we are
- appending to a long list of tasks with timeouts) */
- prev = pending_timeout_last;
- if (prev != NULL)
- {
- if (prev->timeout.abs_value > t->timeout.abs_value)
- prev = NULL;
- else
- pos = prev->next; /* heuristic success! */
- }
- if (prev == NULL)
- {
- /* heuristic failed, do traversal of timeout list */
- pos = pending_timeout;
- }
- while ( (pos != NULL) &&
- ( (pos->timeout.abs_value <= t->timeout.abs_value) ||
- (pos->reason != 0) ) )
- {
- prev = pos;
- pos = pos->next;
- }
- if (prev == NULL)
- pending_timeout = t;
- else
- prev->next = t;
- t->next = pos;
- /* hyper-optimization... */
- pending_timeout_last = t;
-
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding task: %llu / %p\n", t->id, t->callback_cls);
-#endif
-#if EXECINFO
- int i;
-
- for (i=0;i<t->num_backtrace_strings;i++)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Task %llu trace %d: %s\n",
- t->id,
- i,
- t->backtrace_strings[i]);
-#endif
- return t->id;
-
-#else
- /* unoptimized version */
- return GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_KEEP,
- GNUNET_SCHEDULER_NO_TASK, delay,
- NULL, NULL, task, task_cls);
-#endif
+ t->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
+ t->priority = GNUNET_SCHEDULER_PRIORITY_SHUTDOWN;
+ t->on_shutdown = GNUNET_YES;
+ t->lifeness = GNUNET_YES;
+ GNUNET_CONTAINER_DLL_insert (shutdown_head,
+ shutdown_tail,
+ t);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding task: %p\n",
+ t);
+ init_backtrace (t);
+ return t;
}
-
/**
- * Schedule a new task to be run as soon as possible. The task
- * will be run with the priority of the calling task.
+ * Schedule a new task to be run as soon as possible with the
+ * (transitive) ignore-shutdown flag either explicitly set or
+ * explicitly enabled. This task (and all tasks created from it,
+ * other than by another call to this function) will either count or
+ * not count for the "lifeness" of the process. This API is only
+ * useful in a few special cases.
*
+ * @param lifeness #GNUNET_YES if the task counts for lifeness, #GNUNET_NO if not.
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
-GNUNET_SCHEDULER_add_now (GNUNET_SCHEDULER_Task task,
- void *task_cls)
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_now_with_lifeness (int lifeness,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
- return GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_KEEP,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_ZERO,
- NULL, NULL, task, task_cls);
+ struct GNUNET_SCHEDULER_Task *ret;
+
+ ret = GNUNET_SCHEDULER_add_now (task, task_cls);
+ ret->lifeness = lifeness;
+ return ret;
}
+int scheduler_multi_function_call(struct GNUNET_SCHEDULER_Task *t, int (*driver_func)())
+{
+ if (t->fds_len > 1){
+ int success = GNUNET_YES;
+ for (int i = 0; i < t->fds_len;i++){
+ success = driver_func(scheduler_driver->cls, t , t->fds+i) && success;
+ }
+ return success;
+ }else{
+ return driver_func(scheduler_driver->cls, t , t->fds);
+ }
+}
/**
* Schedule a new task to be run with a specified delay or when any of
* (prerequisite-run)
* && (delay-ready
* || any-rs-ready
- * || any-ws-ready
- * || shutdown-active )
+ * || any-ws-ready)
* </code>
*
- * @param delay how long should we wait? Use GNUNET_TIME_UNIT_FOREVER_REL for "forever",
- * which means that the task will only be run after we receive SIGTERM
+ * @param delay how long should we wait?
+ * @param priority priority to use
* @param rfd file descriptor we want to read (can be -1)
* @param wfd file descriptors we want to write (can be -1)
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+#ifndef MINGW
+static struct GNUNET_SCHEDULER_Task *
add_without_sets (struct GNUNET_TIME_Relative delay,
- int rfd,
- int wfd,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+ enum GNUNET_SCHEDULER_Priority priority,
+ const struct GNUNET_NETWORK_Handle *read_nh,
+ const struct GNUNET_NETWORK_Handle *write_nh,
+ const struct GNUNET_DISK_FileHandle *read_fh,
+ const struct GNUNET_DISK_FileHandle *write_fh,
+ //int rfd,
+ //int wfd,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
- struct Task *t;
-#if EXECINFO
- void *backtrace_array[MAX_TRACE_DEPTH];
-#endif
+ struct GNUNET_SCHEDULER_Task *t;
- GNUNET_assert (active_task != NULL);
+ GNUNET_assert (NULL != active_task);
GNUNET_assert (NULL != task);
- t = GNUNET_malloc (sizeof (struct Task));
+ t= initFdInfo (read_nh, write_nh, read_fh, write_fh);
+
t->callback = task;
t->callback_cls = task_cls;
-#if EXECINFO
- t->num_backtrace_strings = backtrace(backtrace_array, MAX_TRACE_DEPTH);
- t->backtrace_strings = backtrace_symbols(backtrace_array, t->num_backtrace_strings);
+#if DEBUG_FDS
+ if (-1 != rfd)
+ {
+ int flags = fcntl (rfd, F_GETFD);
+
+ if ((flags == -1) && (errno == EBADF))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "Got invalid file descriptor %d!\n",
+ rfd);
+ init_backtrace (t);
+ GNUNET_assert (0);
+ }
+ }
+ if (-1 != wfd)
+ {
+ int flags = fcntl (wfd, F_GETFD);
+
+ if (flags == -1 && errno == EBADF)
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "Got invalid file descriptor %d!\n",
+ wfd);
+ init_backtrace (t);
+ GNUNET_assert (0);
+ }
+ }
#endif
- t->read_fd = rfd;
- t->write_fd = wfd;
- t->id = ++last_id;
+
#if PROFILE_DELAYS
t->start_time = GNUNET_TIME_absolute_get ();
#endif
- t->prereq_id = GNUNET_SCHEDULER_NO_TASK;
t->timeout = GNUNET_TIME_relative_to_absolute (delay);
- t->priority = check_priority (current_priority);
- t->next = pending;
- pending = t;
+ t->priority = check_priority ((priority == GNUNET_SCHEDULER_PRIORITY_KEEP) ? current_priority : priority);
+ t->lifeness = current_lifeness;
+
+
+
+ scheduler_multi_function_call(t, scheduler_driver->add);
+
max_priority_added = GNUNET_MAX (max_priority_added,
- t->priority);
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding task: %llu / %p\n", t->id, t->callback_cls);
-#endif
-#if EXECINFO
- int i;
-
- for (i=0;i<t->num_backtrace_strings;i++)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Task %llu trace %d: %s\n",
- t->id,
- i,
- t->backtrace_strings[i]);
-#endif
- return t->id;
+ t->priority);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding task %p\n",
+ t);
+ init_backtrace (t);
+ return t;
}
-
+#endif
/**
* specified file descriptor is ready for reading. The delay can be
* used as a timeout on the socket being ready. The task will be
* scheduled for execution once either the delay has expired or the
- * socket operation is ready. It will be run with the priority of
- * the calling task.
+ * socket operation is ready. It will be run with the DEFAULT priority.
*
- * @param delay when should this operation time out? Use
- * GNUNET_TIME_UNIT_FOREVER_REL for "on shutdown"
+ * @param delay when should this operation time out?
* @param rfd read file-descriptor
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+struct GNUNET_SCHEDULER_Task *
GNUNET_SCHEDULER_add_read_net (struct GNUNET_TIME_Relative delay,
- struct GNUNET_NETWORK_Handle * rfd,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+ struct GNUNET_NETWORK_Handle *rfd,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
+{
+ return GNUNET_SCHEDULER_add_read_net_with_priority (delay,
+ GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ rfd, task, task_cls);
+}
+
+
+/**
+ * Schedule a new task to be run with a specified priority and to be
+ * run after the specified delay or when the specified file descriptor
+ * is ready for reading. The delay can be used as a timeout on the
+ * socket being ready. The task will be scheduled for execution once
+ * either the delay has expired or the socket operation is ready. It
+ * will be run with the DEFAULT priority.
+ *
+ * @param delay when should this operation time out?
+ * @param priority priority to use for the task
+ * @param rfd read file-descriptor
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_read_net_with_priority (struct GNUNET_TIME_Relative delay,
+ enum GNUNET_SCHEDULER_Priority priority,
+ struct GNUNET_NETWORK_Handle *rfd,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
- return add_without_sets (delay,
- GNUNET_NETWORK_get_fd (rfd),
- -1,
- task,
- task_cls);
+ return GNUNET_SCHEDULER_add_net_with_priority (delay, priority,
+ rfd,
+ GNUNET_YES,
+ GNUNET_NO,
+ task, task_cls);
}
* socket operation is ready. It will be run with the priority of
* the calling task.
*
- * @param delay when should this operation time out? Use
- * GNUNET_TIME_UNIT_FOREVER_REL for "on shutdown"
+ * @param delay when should this operation time out?
* @param wfd write file-descriptor
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+struct GNUNET_SCHEDULER_Task *
GNUNET_SCHEDULER_add_write_net (struct GNUNET_TIME_Relative delay,
- struct GNUNET_NETWORK_Handle * wfd,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+ struct GNUNET_NETWORK_Handle *wfd,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
- return add_without_sets (delay,
- -1,
- GNUNET_NETWORK_get_fd (wfd),
- task,
- task_cls);
+ return GNUNET_SCHEDULER_add_net_with_priority (delay,
+ GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ wfd,
+ GNUNET_NO, GNUNET_YES,
+ task, task_cls);
}
-
/**
* Schedule a new task to be run with a specified delay or when the
- * specified file descriptor is ready for reading. The delay can be
+ * specified file descriptor is ready. The delay can be
* used as a timeout on the socket being ready. The task will be
* scheduled for execution once either the delay has expired or the
- * socket operation is ready. It will be run with the priority of
- * the calling task.
+ * socket operation is ready.
*
- * @param delay when should this operation time out? Use
- * GNUNET_TIME_UNIT_FOREVER_REL for "on shutdown"
- * @param rfd read file-descriptor
+ * @param delay when should this operation time out?
+ * @param priority priority of the task
+ * @param fd file-descriptor
+ * @param on_read whether to poll the file-descriptor for readability
+ * @param on_write whether to poll the file-descriptor for writability
* @param task main function of the task
* @param task_cls closure of task
* @return unique task identifier for the job
* only valid until "task" is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
-GNUNET_SCHEDULER_add_read_file (struct GNUNET_TIME_Relative delay,
- const struct GNUNET_DISK_FileHandle * rfd,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_net_with_priority (struct GNUNET_TIME_Relative delay,
+ enum GNUNET_SCHEDULER_Priority priority,
+ struct GNUNET_NETWORK_Handle *fd,
+ int on_read,
+ int on_write,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
#if MINGW
- struct GNUNET_NETWORK_FDSet *rs;
- GNUNET_SCHEDULER_TaskIdentifier ret;
-
- GNUNET_assert (rfd != NULL);
- rs = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_handle_set (rs, rfd);
- ret = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_KEEP,
- GNUNET_SCHEDULER_NO_TASK, delay,
- rs, NULL, task, task_cls);
- GNUNET_NETWORK_fdset_destroy (rs);
+ struct GNUNET_NETWORK_FDSet *s;
+ struct GNUNET_SCHEDULER_Task * ret;
+
+ GNUNET_assert (NULL != fd);
+ s = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_set (s, fd);
+ ret = GNUNET_SCHEDULER_add_select (
+ priority, delay,
+ on_read ? s : NULL,
+ on_write ? s : NULL,
+ task, task_cls);
+ GNUNET_NETWORK_fdset_destroy (s);
return ret;
#else
- int fd;
+ GNUNET_assert (on_read || on_write);
+ GNUNET_assert (GNUNET_NETWORK_get_fd (fd) >= 0);
+ return add_without_sets (delay, priority,
+ on_read ? fd : NULL,
+ on_write ? fd : NULL,
+ NULL,
+ NULL,
+ task, task_cls);
+#endif
+}
- GNUNET_DISK_internal_file_handle_ (rfd, &fd, sizeof (int));
- return add_without_sets (delay,
- fd,
- -1,
- task,
- task_cls);
-#endif
+/**
+ * Schedule a new task to be run with a specified delay or when the
+ * specified file descriptor is ready for reading. The delay can be
+ * used as a timeout on the socket being ready. The task will be
+ * scheduled for execution once either the delay has expired or the
+ * socket operation is ready. It will be run with the DEFAULT priority.
+ *
+ * @param delay when should this operation time out?
+ * @param rfd read file-descriptor
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_read_file (struct GNUNET_TIME_Relative delay,
+ const struct GNUNET_DISK_FileHandle *rfd,
+ GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
+{
+ return GNUNET_SCHEDULER_add_file_with_priority (
+ delay, GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ rfd, GNUNET_YES, GNUNET_NO,
+ task, task_cls);
}
* specified file descriptor is ready for writing. The delay can be
* used as a timeout on the socket being ready. The task will be
* scheduled for execution once either the delay has expired or the
- * socket operation is ready. It will be run with the priority of
- * the calling task.
+ * socket operation is ready. It will be run with the DEFAULT priority.
*
- * @param delay when should this operation time out? Use
- * GNUNET_TIME_UNIT_FOREVER_REL for "on shutdown"
+ * @param delay when should this operation time out?
* @param wfd write file-descriptor
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+struct GNUNET_SCHEDULER_Task *
GNUNET_SCHEDULER_add_write_file (struct GNUNET_TIME_Relative delay,
- const struct GNUNET_DISK_FileHandle * wfd,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+ const struct GNUNET_DISK_FileHandle *wfd,
+ GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
{
-#if MINGW
- struct GNUNET_NETWORK_FDSet *ws;
- GNUNET_SCHEDULER_TaskIdentifier ret;
+ return GNUNET_SCHEDULER_add_file_with_priority (
+ delay, GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ wfd, GNUNET_NO, GNUNET_YES,
+ task, task_cls);
+}
- GNUNET_assert (wfd != NULL);
- ws = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_handle_set (ws, wfd);
- ret = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_KEEP,
- GNUNET_SCHEDULER_NO_TASK,
- delay, NULL, ws, task, task_cls);
- GNUNET_NETWORK_fdset_destroy (ws);
+
+/**
+ * Schedule a new task to be run with a specified delay or when the
+ * specified file descriptor is ready. The delay can be
+ * used as a timeout on the socket being ready. The task will be
+ * scheduled for execution once either the delay has expired or the
+ * socket operation is ready.
+ *
+ * @param delay when should this operation time out?
+ * @param priority priority of the task
+ * @param fd file-descriptor
+ * @param on_read whether to poll the file-descriptor for readability
+ * @param on_write whether to poll the file-descriptor for writability
+ * @param task main function of the task
+ * @param task_cls closure of @a task
+ * @return unique task identifier for the job
+ * only valid until @a task is started!
+ */
+struct GNUNET_SCHEDULER_Task *
+GNUNET_SCHEDULER_add_file_with_priority (struct GNUNET_TIME_Relative delay,
+ enum GNUNET_SCHEDULER_Priority priority,
+ const struct GNUNET_DISK_FileHandle *fd,
+ int on_read, int on_write,
+ GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
+{
+#if MINGW
+ struct GNUNET_NETWORK_FDSet *s;
+ struct GNUNET_SCHEDULER_Task * ret;
+
+ GNUNET_assert (NULL != fd);
+ s = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_handle_set (s, fd);
+ ret = GNUNET_SCHEDULER_add_select (
+ priority, delay,
+ on_read ? s : NULL,
+ on_write ? s : NULL,
+ task, task_cls);
+ GNUNET_NETWORK_fdset_destroy (s);
return ret;
#else
- int fd;
-
- GNUNET_DISK_internal_file_handle_ (wfd, &fd, sizeof (int));
- return add_without_sets (delay,
- -1,
- fd,
- task,
- task_cls);
-
+ GNUNET_assert (on_read || on_write);
+ GNUNET_assert(fd->fd >= 0);
+ return add_without_sets (delay, priority,
+ NULL,
+ NULL,
+ on_read ? fd : NULL,
+ on_write ? fd : NULL,
+ task, task_cls);
#endif
}
-
/**
* Schedule a new task to be run with a specified delay or when any of
* the specified file descriptor sets is ready. The delay can be used
* (prerequisite-run)
* && (delay-ready
* || any-rs-ready
- * || any-ws-ready
- * || (shutdown-active && run-on-shutdown) )
+ * || any-ws-ready) )
* </code>
*
* @param prio how important is this task?
- * @param prerequisite_task run this task after the task with the given
- * task identifier completes (and any of our other
- * conditions, such as delay, read or write-readiness
- * are satisfied). Use GNUNET_SCHEDULER_NO_TASK to not have any dependency
- * on completion of other tasks.
- * @param delay how long should we wait? Use GNUNET_TIME_UNIT_FOREVER_REL for "forever",
- * which means that the task will only be run after we receive SIGTERM
+ * @param delay how long should we wait?
* @param rs set of file descriptors we want to read (can be NULL)
* @param ws set of file descriptors we want to write (can be NULL)
* @param task main function of the task
- * @param task_cls closure of task
+ * @param task_cls closure of @a task
* @return unique task identifier for the job
- * only valid until "task" is started!
+ * only valid until @a task is started!
*/
-GNUNET_SCHEDULER_TaskIdentifier
+struct GNUNET_SCHEDULER_Task *
GNUNET_SCHEDULER_add_select (enum GNUNET_SCHEDULER_Priority prio,
- GNUNET_SCHEDULER_TaskIdentifier
- prerequisite_task,
struct GNUNET_TIME_Relative delay,
- const struct GNUNET_NETWORK_FDSet * rs,
- const struct GNUNET_NETWORK_FDSet * ws,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+ const struct GNUNET_NETWORK_FDSet *rs,
+ const struct GNUNET_NETWORK_FDSet *ws,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
{
- struct Task *t;
-#if EXECINFO
- void *backtrace_array[MAX_TRACE_DEPTH];
-#endif
-
- GNUNET_assert (active_task != NULL);
+ struct GNUNET_SCHEDULER_Task *t;
+
+ if ( (NULL == rs) &&
+ (NULL == ws) )
+ return GNUNET_SCHEDULER_add_delayed_with_priority (delay,
+ prio,
+ task,
+ task_cls);
+ GNUNET_assert (NULL != active_task);
GNUNET_assert (NULL != task);
- t = GNUNET_malloc (sizeof (struct Task));
+ t = GNUNET_new (struct GNUNET_SCHEDULER_Task);
t->callback = task;
t->callback_cls = task_cls;
-#if EXECINFO
- t->num_backtrace_strings = backtrace(backtrace_array, MAX_TRACE_DEPTH);
- t->backtrace_strings = backtrace_symbols(backtrace_array, t->num_backtrace_strings);
-#endif
t->read_fd = -1;
t->write_fd = -1;
- if (rs != NULL)
- {
- t->read_set = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_copy (t->read_set, rs);
- }
- if (ws != NULL)
- {
- t->write_set = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_copy (t->write_set, ws);
- }
- t->id = ++last_id;
+ if (NULL != rs)
+ {
+ t->read_set = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_copy (t->read_set, rs);
+ }
+ if (NULL != ws)
+ {
+ t->write_set = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_copy (t->write_set, ws);
+ }
#if PROFILE_DELAYS
t->start_time = GNUNET_TIME_absolute_get ();
#endif
- t->prereq_id = prerequisite_task;
t->timeout = GNUNET_TIME_relative_to_absolute (delay);
t->priority =
- check_priority ((prio ==
- GNUNET_SCHEDULER_PRIORITY_KEEP) ? current_priority
- : prio);
- t->next = pending;
- pending = t;
+ check_priority ((prio ==
+ GNUNET_SCHEDULER_PRIORITY_KEEP) ? current_priority :
+ prio);
+ t->lifeness = current_lifeness;
+
+ scheduler_multi_function_call(t, scheduler_driver->add);
+
max_priority_added = GNUNET_MAX (max_priority_added,
- t->priority);
-#if DEBUG_TASKS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding task: %llu / %p\n", t->id, t->callback_cls);
+ t->priority);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding task %p\n",
+ t);
+ init_backtrace (t);
+ return t;
+}
+
+
+/**
+ * Function used by event-loop implementations to signal the scheduler
+ * that a particular @a task is ready due to an event of type @a et.
+ *
+ * This function will then queue the task to notify the application
+ * that the task is ready (with the respective priority).
+ *
+ * @param task the task that is ready, NULL for wake up calls
+ * @param et information about why the task is ready
+ */
+void
+GNUNET_SCHEDULER_task_ready (struct GNUNET_SCHEDULER_Task *task,
+ enum GNUNET_SCHEDULER_EventType et)
+{
+ enum GNUNET_SCHEDULER_Reason reason;
+ struct GNUNET_TIME_Absolute now;
+
+ now = GNUNET_TIME_absolute_get ();
+ reason = task->reason;
+ if (now.abs_value_us >= task->timeout.abs_value_us)
+ reason |= GNUNET_SCHEDULER_REASON_TIMEOUT;
+ if ( (0 == (reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
+ (0 != (GNUNET_SCHEDULER_ET_IN & et)) )
+ reason |= GNUNET_SCHEDULER_REASON_READ_READY;
+ if ( (0 == (reason & GNUNET_SCHEDULER_REASON_WRITE_READY)) &&
+ (0 != (GNUNET_SCHEDULER_ET_OUT & et)) )
+ reason |= GNUNET_SCHEDULER_REASON_WRITE_READY;
+ reason |= GNUNET_SCHEDULER_REASON_PREREQ_DONE;
+ task->reason = reason;
+ task->fds = &task->fdx;
+ task->fdx.et = et;
+ task->fds_len = 1;
+ queue_ready_task (task);
+}
+
+
+/**
+ * Function called by the driver to tell the scheduler to run some of
+ * the tasks that are ready. This function may return even though
+ * there are tasks left to run just to give other tasks a chance as
+ * well. If we return #GNUNET_YES, the driver should call this
+ * function again as soon as possible, while if we return #GNUNET_NO
+ * it must block until the operating system has more work as the
+ * scheduler has no more work to do right now.
+ *
+ * @param sh scheduler handle that was given to the `loop`
+ * @return #GNUNET_OK if there are more tasks that are ready,
+ * and thus we would like to run more (yield to avoid
+ * blocking other activities for too long)
+ * #GNUNET_NO if we are done running tasks (yield to block)
+ * #GNUNET_SYSERR on error
+ */
+int
+GNUNET_SCHEDULER_run_from_driver (struct GNUNET_SCHEDULER_Handle *sh)
+{
+ enum GNUNET_SCHEDULER_Priority p;
+ struct GNUNET_SCHEDULER_Task *pos;
+ struct GNUNET_TIME_Absolute now;
+
+ /* check for tasks that reached the timeout! */
+ now = GNUNET_TIME_absolute_get ();
+ while (NULL != (pos = pending_timeout_head))
+ {
+ if (now.abs_value_us >= pos->timeout.abs_value_us)
+ pos->reason |= GNUNET_SCHEDULER_REASON_TIMEOUT;
+ if (0 == pos->reason)
+ break;
+ GNUNET_CONTAINER_DLL_remove (pending_timeout_head,
+ pending_timeout_tail,
+ pos);
+ if (pending_timeout_last == pos)
+ pending_timeout_last = NULL;
+ queue_ready_task (pos);
+ }
+
+ if (0 == ready_count)
+ return GNUNET_NO;
+
+ /* find out which task priority level we are going to
+ process this time */
+ max_priority_added = GNUNET_SCHEDULER_PRIORITY_KEEP;
+ GNUNET_assert (NULL == ready_head[GNUNET_SCHEDULER_PRIORITY_KEEP]);
+ /* yes, p>0 is correct, 0 is "KEEP" which should
+ * always be an empty queue (see assertion)! */
+ for (p = GNUNET_SCHEDULER_PRIORITY_COUNT - 1; p > 0; p--)
+ {
+ pos = ready_head[p];
+ if (NULL != pos)
+ break;
+ }
+ GNUNET_assert (NULL != pos); /* ready_count wrong? */
+
+ /* process all tasks at this priority level, then yield */
+ while (NULL != (pos = ready_head[p]))
+ {
+ GNUNET_CONTAINER_DLL_remove (ready_head[p],
+ ready_tail[p],
+ pos);
+ ready_count--;
+ current_priority = pos->priority;
+ current_lifeness = pos->lifeness;
+ active_task = pos;
+#if PROFILE_DELAYS
+ if (GNUNET_TIME_absolute_get_duration (pos->start_time).rel_value_us >
+ DELAY_THRESHOLD.rel_value_us)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Task %p took %s to be scheduled\n",
+ pos,
+ GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (pos->start_time),
+ GNUNET_YES));
+ }
#endif
-#if EXECINFO
- int i;
-
- for (i=0;i<t->num_backtrace_strings;i++)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Task %llu trace %d: %s\n",
- t->id,
- i,
- t->backtrace_strings[i]);
+ tc.reason = pos->reason;
+ GNUNET_NETWORK_fdset_zero (sh->rs);
+ GNUNET_NETWORK_fdset_zero (sh->ws);
+ tc.fds_len = pos->fds_len;
+ tc.fds = pos->fds;
+ tc.read_ready = (NULL == pos->read_set) ? sh->rs : pos->read_set;
+ if ( (-1 != pos->read_fd) &&
+ (0 != (pos->reason & GNUNET_SCHEDULER_REASON_READ_READY)) )
+ GNUNET_NETWORK_fdset_set_native (sh->rs,
+ pos->read_fd);
+ tc.write_ready = (NULL == pos->write_set) ? sh->ws : pos->write_set;
+ if ((-1 != pos->write_fd) &&
+ (0 != (pos->reason & GNUNET_SCHEDULER_REASON_WRITE_READY)))
+ GNUNET_NETWORK_fdset_set_native (sh->ws,
+ pos->write_fd);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Running task: %p\n",
+ pos);
+ pos->callback (pos->callback_cls);
+ active_task = NULL;
+ dump_backtrace (pos);
+ destroy_task (pos);
+ tasks_run++;
+ }
+ if (0 == ready_count)
+ return GNUNET_NO;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Initialize and run scheduler. This function will return when all
+ * tasks have completed. On systems with signals, receiving a SIGTERM
+ * (and other similar signals) will cause #GNUNET_SCHEDULER_shutdown
+ * to be run after the active task is complete. As a result, SIGTERM
+ * causes all shutdown tasks to be scheduled with reason
+ * #GNUNET_SCHEDULER_REASON_SHUTDOWN. (However, tasks added
+ * afterwards will execute normally!). Note that any particular
+ * signal will only shut down one scheduler; applications should
+ * always only create a single scheduler.
+ *
+ * @param driver drive to use for the event loop
+ * @param task task to run first (and immediately)
+ * @param task_cls closure of @a task
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
+ */
+int
+GNUNET_SCHEDULER_run_with_driver (const struct GNUNET_SCHEDULER_Driver *driver,
+ GNUNET_SCHEDULER_TaskCallback task,
+ void *task_cls)
+{
+ int ret;
+ struct GNUNET_SCHEDULER_Handle sh;
+ struct GNUNET_SIGNAL_Context *shc_int;
+ struct GNUNET_SIGNAL_Context *shc_term;
+#if (SIGTERM != GNUNET_TERM_SIG)
+ struct GNUNET_SIGNAL_Context *shc_gterm;
#endif
- return t->id;
+#ifndef MINGW
+ struct GNUNET_SIGNAL_Context *shc_quit;
+ struct GNUNET_SIGNAL_Context *shc_hup;
+ struct GNUNET_SIGNAL_Context *shc_pipe;
+#endif
+ struct GNUNET_SCHEDULER_Task tsk;
+ const struct GNUNET_DISK_FileHandle *pr;
+ scheduler_driver = driver;
+
+ /* general set-up */
+ GNUNET_assert (NULL == active_task);
+ GNUNET_assert (NULL == shutdown_pipe_handle);
+ shutdown_pipe_handle = GNUNET_DISK_pipe (GNUNET_NO,
+ GNUNET_NO,
+ GNUNET_NO,
+ GNUNET_NO);
+ GNUNET_assert (NULL != shutdown_pipe_handle);
+ pr = GNUNET_DISK_pipe_handle (shutdown_pipe_handle,
+ GNUNET_DISK_PIPE_END_READ);
+ GNUNET_assert (NULL != pr);
+ my_pid = getpid ();
+
+ /* install signal handlers */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Registering signal handlers\n");
+ shc_int = GNUNET_SIGNAL_handler_install (SIGINT,
+ &sighandler_shutdown);
+ shc_term = GNUNET_SIGNAL_handler_install (SIGTERM,
+ &sighandler_shutdown);
+#if (SIGTERM != GNUNET_TERM_SIG)
+ shc_gterm = GNUNET_SIGNAL_handler_install (GNUNET_TERM_SIG,
+ &sighandler_shutdown);
+#endif
+#ifndef MINGW
+ shc_pipe = GNUNET_SIGNAL_handler_install (SIGPIPE,
+ &sighandler_pipe);
+ shc_quit = GNUNET_SIGNAL_handler_install (SIGQUIT,
+ &sighandler_shutdown);
+ shc_hup = GNUNET_SIGNAL_handler_install (SIGHUP,
+ &sighandler_shutdown);
+#endif
+
+ /* Setup initial tasks */
+ current_priority = GNUNET_SCHEDULER_PRIORITY_DEFAULT;
+ current_lifeness = GNUNET_YES;
+ memset (&tsk,
+ 0,
+ sizeof (tsk));
+ active_task = &tsk;
+ tsk.sh = &sh;
+ GNUNET_SCHEDULER_add_with_reason_and_priority (task,
+ task_cls,
+ GNUNET_SCHEDULER_REASON_STARTUP,
+ GNUNET_SCHEDULER_PRIORITY_DEFAULT);
+ GNUNET_SCHEDULER_add_now_with_lifeness (GNUNET_NO,
+ &GNUNET_OS_install_parent_control_handler,
+ NULL);
+ active_task = NULL;
+ driver->set_wakeup (driver->cls,
+ GNUNET_TIME_absolute_get ());
+
+ /* begin main event loop */
+ sh.rs = GNUNET_NETWORK_fdset_create ();
+ sh.ws = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_handle_set (sh.rs, pr);
+ sh.driver = driver;
+ ret = driver->loop (driver->cls,
+ &sh);
+ GNUNET_NETWORK_fdset_destroy (sh.rs);
+ GNUNET_NETWORK_fdset_destroy (sh.ws);
+
+ /* uninstall signal handlers */
+ GNUNET_SIGNAL_handler_uninstall (shc_int);
+ GNUNET_SIGNAL_handler_uninstall (shc_term);
+#if (SIGTERM != GNUNET_TERM_SIG)
+ GNUNET_SIGNAL_handler_uninstall (shc_gterm);
+#endif
+#ifndef MINGW
+ GNUNET_SIGNAL_handler_uninstall (shc_pipe);
+ GNUNET_SIGNAL_handler_uninstall (shc_quit);
+ GNUNET_SIGNAL_handler_uninstall (shc_hup);
+#endif
+ GNUNET_DISK_pipe_close (shutdown_pipe_handle);
+ shutdown_pipe_handle = NULL;
+ return ret;
}
+int
+select_add(void *cls,
+ struct GNUNET_SCHEDULER_Task *task,
+ struct GNUNET_SCHEDULER_FdInfo *fdi){
+
+ GNUNET_CONTAINER_DLL_insert (pending_head,
+ pending_tail,
+ task);
+
+}
+
+int
+select_del(void *cls,
+ struct GNUNET_SCHEDULER_Task *task,
+ struct GNUNET_SCHEDULER_FdInfo *fdi){
+
+ GNUNET_CONTAINER_DLL_remove (pending_head,
+ pending_tail,
+ task);
+
+}
+
+
+int
+select_loop(void *cls,
+ struct GNUNET_SCHEDULER_Handle *sh){
+
+ while_live(sh->rs, sh->ws);
+
+}
+
+static void
+select_set_wakeup(void *cls,
+ struct GNUNET_TIME_Absolute dt){
+
+
+
+}
+
+
+/**
+ * Obtain the driver for using select() as the event loop.
+ *
+ * @return NULL on error
+ */
+const struct GNUNET_SCHEDULER_Driver *
+GNUNET_SCHEDULER_driver_select ()
+{
+
+ struct GNUNET_SCHEDULER_Driver *select_driver;
+
+ select_driver = GNUNET_new (struct GNUNET_SCHEDULER_Driver);
+
+ select_driver->loop = &select_loop;
+ select_driver->add = &select_add;
+ select_driver->del = &select_del;
+ select_driver->set_wakeup = &select_set_wakeup;
+
+
+ return select_driver;
+}
+
+
/* end of scheduler.c */
projects / oweals / gnunet.git / blobdiff