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22 * @file testbed/testbed_api_operations.c
23 * @brief functions to manage operation queues
24 * @author Christian Grothoff
27 #include "testbed_api_operations.h"
31 * An entry in the operation queue
36 * The next DLL pointer
38 struct QueueEntry *next;
41 * The prev DLL pointer
43 struct QueueEntry *prev;
46 * The operation this entry holds
48 struct GNUNET_TESTBED_Operation *op;
53 * Queue of operations where we can only support a certain
54 * number of concurrent operations of a particular type.
59 * The head of the operation queue
61 struct QueueEntry *head;
64 * The tail of the operation queue
66 struct QueueEntry *tail;
69 * Number of operations that can be concurrently
70 * active in this queue.
82 * The operation is just created and is in initial state
87 * The operation is currently waiting for resources
92 * The operation is ready to be started
97 * The operation has started
104 * Opaque handle to an abstract operation to be executed by the testing framework.
106 struct GNUNET_TESTBED_Operation
109 * Function to call when we have the resources to begin the operation.
111 OperationStart start;
114 * Function to call to clean up after the operation (which may or may
115 * not have been started yet).
117 OperationRelease release;
120 * Closure for callbacks.
125 * Array of operation queues this Operation belongs to.
127 struct OperationQueue **queues;
130 * The id of the task which calls OperationStart for this operation
132 GNUNET_SCHEDULER_TaskIdentifier start_task_id;
135 * Number of queues in the operation queues array
137 unsigned int nqueues;
140 * The state of the operation
142 enum OperationState state;
148 * Task for calling OperationStart on operation
150 * @param cls the Operation
151 * @param tc the TaskContext from scheduler
154 call_start (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
156 struct GNUNET_TESTBED_Operation *op = cls;
158 op->start_task_id = GNUNET_SCHEDULER_NO_TASK;
159 op->state = OP_STATE_STARTED;
160 if (NULL != op->start)
162 op->start (op->cb_cls);
168 * Checks for the readiness of an operation and schedules a operation start task
170 * @param op the operation
173 check_readiness (struct GNUNET_TESTBED_Operation *op)
177 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == op->start_task_id);
178 for (i = 0; i < op->nqueues; i++)
180 if (0 == op->queues[i]->active)
183 for (i = 0; i < op->nqueues; i++)
185 op->queues[i]->active--;
187 op->state = OP_STATE_READY;
188 op->start_task_id = GNUNET_SCHEDULER_add_now (&call_start, op);
193 * Create an 'operation' to be performed.
195 * @param cls closure for the callbacks
196 * @param start function to call to start the operation
197 * @param release function to call to close down the operation
198 * @return handle to the operation
200 struct GNUNET_TESTBED_Operation *
201 GNUNET_TESTBED_operation_create_ (void *cls, OperationStart start,
202 OperationRelease release)
204 struct GNUNET_TESTBED_Operation *op;
206 op = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Operation));
208 op->state = OP_STATE_INIT;
209 op->release = release;
211 op->start_task_id = GNUNET_SCHEDULER_NO_TASK;
217 * Create an operation queue.
219 * @param max_active maximum number of operations in this
220 * queue that can be active in parallel at the same time
221 * @return handle to the queue
223 struct OperationQueue *
224 GNUNET_TESTBED_operation_queue_create_ (unsigned int max_active)
226 struct OperationQueue *queue;
228 queue = GNUNET_malloc (sizeof (struct OperationQueue));
229 queue->active = max_active;
235 * Destroy an operation queue. The queue MUST be empty
238 * @param queue queue to destroy
241 GNUNET_TESTBED_operation_queue_destroy_ (struct OperationQueue *queue)
243 GNUNET_break (NULL == queue->head);
244 GNUNET_break (NULL == queue->tail);
250 * Add an operation to a queue. An operation can be in multiple queues at
251 * once. Once the operation is inserted into all the queues
252 * GNUNET_TESTBED_operation_begin_wait_() has to be called to actually start
253 * waiting for the operation to become active.
255 * @param queue queue to add the operation to
256 * @param operation operation to add to the queue
259 GNUNET_TESTBED_operation_queue_insert_ (struct OperationQueue *queue,
260 struct GNUNET_TESTBED_Operation
263 struct QueueEntry *entry;
265 entry = GNUNET_malloc (sizeof (struct QueueEntry));
266 entry->op = operation;
267 GNUNET_CONTAINER_DLL_insert_tail (queue->head, queue->tail, entry);
269 GNUNET_realloc (operation->queues,
270 sizeof (struct OperationQueue *) *
271 (++operation->nqueues));
272 operation->queues[operation->nqueues - 1] = queue;
277 * Marks the given operation as waiting on the queues. Once all queues permit
278 * the operation to become active, the operation will be activated. The actual
279 * activation will occur in a separate task (thus allowing multiple queue
280 * insertions to be made without having the first one instantly trigger the
281 * operation if the first queue has sufficient resources).
283 * @param operation the operation to marks as waiting
286 GNUNET_TESTBED_operation_begin_wait_ (struct GNUNET_TESTBED_Operation
289 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == operation->start_task_id);
290 operation->state = OP_STATE_WAITING;
291 check_readiness (operation);
296 * Remove an operation from a queue. This can be because the
297 * oeration was active and has completed (and the resources have
298 * been released), or because the operation was cancelled and
299 * thus scheduling the operation is no longer required.
301 * @param queue queue to add the operation to
302 * @param operation operation to add to the queue
305 GNUNET_TESTBED_operation_queue_remove_ (struct OperationQueue *queue,
306 struct GNUNET_TESTBED_Operation
309 struct QueueEntry *entry;
310 struct QueueEntry *entry2;
312 for (entry = queue->head; NULL != entry; entry = entry->next)
313 if (entry->op == operation)
315 GNUNET_assert (NULL != entry);
316 if (OP_STATE_STARTED == operation->state)
318 entry2 = entry->next;
319 GNUNET_CONTAINER_DLL_remove (queue->head, queue->tail, entry);
321 for (; NULL != entry2; entry2 = entry2->next)
322 if (OP_STATE_WAITING == entry2->op->state)
326 check_readiness (entry2->op);
331 * An operation is 'done' (was cancelled or finished); remove
332 * it from the queues and release associated resources.
334 * @param operation operation that finished
337 GNUNET_TESTBED_operation_release_ (struct GNUNET_TESTBED_Operation *operation)
341 if (GNUNET_SCHEDULER_NO_TASK != operation->start_task_id)
343 GNUNET_SCHEDULER_cancel (operation->start_task_id);
344 operation->start_task_id = GNUNET_SCHEDULER_NO_TASK;
346 for (i = 0; i < operation->nqueues; i++)
347 GNUNET_TESTBED_operation_queue_remove_ (operation->queues[i], operation);
348 GNUNET_free (operation->queues);
349 if (NULL != operation->release)
350 operation->release (operation->cb_cls);
351 GNUNET_free (operation);
355 /* end of testbed_api_operations.c */