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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;
51 * How many units of resources does the operation need
58 * Queue of operations where we can only support a certain
59 * number of concurrent operations of a particular type.
64 * The head of the operation queue
66 struct QueueEntry *head;
69 * The tail of the operation queue
71 struct QueueEntry *tail;
74 * Number of operations that are currently active in this queue.
79 * Max number of operations which can be active at any time in this queue
81 unsigned int max_active;
92 * The operation is just created and is in initial state
97 * The operation is currently waiting for resources
102 * The operation is ready to be started
107 * The operation has started
114 * Opaque handle to an abstract operation to be executed by the testing framework.
116 struct GNUNET_TESTBED_Operation
119 * Function to call when we have the resources to begin the operation.
121 OperationStart start;
124 * Function to call to clean up after the operation (which may or may
125 * not have been started yet).
127 OperationRelease release;
130 * Closure for callbacks.
135 * Array of operation queues this Operation belongs to.
137 struct OperationQueue **queues;
140 * Array of number resources an operation need from each queue. This numbers
141 * in this array should correspond to the queues array
146 * The id of the task which calls OperationStart for this operation
148 GNUNET_SCHEDULER_TaskIdentifier start_task_id;
151 * Number of queues in the operation queues array
153 unsigned int nqueues;
156 * The state of the operation
158 enum OperationState state;
164 * Task for calling OperationStart on operation
166 * @param cls the Operation
167 * @param tc the TaskContext from scheduler
170 call_start (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
172 struct GNUNET_TESTBED_Operation *op = cls;
174 op->start_task_id = GNUNET_SCHEDULER_NO_TASK;
175 op->state = OP_STATE_STARTED;
176 if (NULL != op->start)
177 op->start (op->cb_cls);
182 * Checks for the readiness of an operation and schedules a operation start task
184 * @param op the operation
187 check_readiness (struct GNUNET_TESTBED_Operation *op)
191 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == op->start_task_id);
192 for (i = 0; i < op->nqueues; i++)
194 GNUNET_assert (0 < op->nres[i]);
195 if ((op->queues[i]->active + op->nres[i]) > op->queues[i]->max_active)
198 for (i = 0; i < op->nqueues; i++)
199 op->queues[i]->active += op->nres[i];
200 op->state = OP_STATE_READY;
201 op->start_task_id = GNUNET_SCHEDULER_add_now (&call_start, op);
206 * Defers a ready to be executed operation back to waiting
208 * @param op the operation to defer
211 defer (struct GNUNET_TESTBED_Operation *op)
215 GNUNET_assert (OP_STATE_READY == op->state);
216 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != op->start_task_id);
217 GNUNET_SCHEDULER_cancel (op->start_task_id);
218 op->start_task_id = GNUNET_SCHEDULER_NO_TASK;
219 for (i = 0; i < op->nqueues; i++)
220 op->queues[i]->active--;
221 op->state = OP_STATE_WAITING;
226 * Create an 'operation' to be performed.
228 * @param cls closure for the callbacks
229 * @param start function to call to start the operation
230 * @param release function to call to close down the operation
231 * @return handle to the operation
233 struct GNUNET_TESTBED_Operation *
234 GNUNET_TESTBED_operation_create_ (void *cls, OperationStart start,
235 OperationRelease release)
237 struct GNUNET_TESTBED_Operation *op;
239 op = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Operation));
241 op->state = OP_STATE_INIT;
242 op->release = release;
244 op->start_task_id = GNUNET_SCHEDULER_NO_TASK;
250 * Create an operation queue.
252 * @param max_active maximum number of operations in this
253 * queue that can be active in parallel at the same time
254 * @return handle to the queue
256 struct OperationQueue *
257 GNUNET_TESTBED_operation_queue_create_ (unsigned int max_active)
259 struct OperationQueue *queue;
261 queue = GNUNET_malloc (sizeof (struct OperationQueue));
262 queue->max_active = max_active;
268 * Destroy an operation queue. The queue MUST be empty
271 * @param queue queue to destroy
274 GNUNET_TESTBED_operation_queue_destroy_ (struct OperationQueue *queue)
276 GNUNET_break (NULL == queue->head);
277 GNUNET_break (NULL == queue->tail);
283 * Destroys the operation queue if it is empty. If not empty return GNUNET_NO.
285 * @param queue the queue to destroy if empty
286 * @return GNUNET_YES if the queue is destroyed. GNUNET_NO if not (because it
290 GNUNET_TESTBED_operation_queue_destroy_empty_ (struct OperationQueue *queue)
292 if (NULL != queue->head)
294 GNUNET_TESTBED_operation_queue_destroy_ (queue);
300 * Function to reset the maximum number of operations in the given queue. If
301 * max_active is lesser than the number of currently active operations, the
302 * active operations are not stopped immediately.
304 * @param queue the operation queue which has to be modified
305 * @param max_active the new maximum number of active operations
308 GNUNET_TESTBED_operation_queue_reset_max_active_ (struct OperationQueue *queue,
309 unsigned int max_active)
311 struct QueueEntry *entry;
313 queue->max_active = max_active;
314 /* if (queue->active >= queue->max_active) */
318 while ((queue->active > queue->max_active) && (NULL != entry))
320 if (entry->op->state == OP_STATE_READY)
326 while ((NULL != entry) && (queue->active < queue->max_active))
328 if (OP_STATE_WAITING == entry->op->state)
329 check_readiness (entry->op);
336 * Add an operation to a queue. An operation can be in multiple queues at
337 * once. Once the operation is inserted into all the queues
338 * GNUNET_TESTBED_operation_begin_wait_() has to be called to actually start
339 * waiting for the operation to become active.
341 * @param queue queue to add the operation to
342 * @param operation operation to add to the queue
343 * @param nres the number of units of the resources of queue needed by the
344 * operation. Should be greater than 0.
347 GNUNET_TESTBED_operation_queue_insert2_ (struct OperationQueue *queue,
348 struct GNUNET_TESTBED_Operation
349 *operation, unsigned int nres)
351 struct QueueEntry *entry;
354 GNUNET_assert (0 < nres);
355 entry = GNUNET_malloc (sizeof (struct QueueEntry));
356 entry->op = operation;
358 GNUNET_CONTAINER_DLL_insert_tail (queue->head, queue->tail, entry);
359 qsize = operation->nqueues;
360 GNUNET_array_append (operation->queues, operation->nqueues, queue);
361 GNUNET_array_append (operation->nres, qsize, nres);
362 GNUNET_assert (qsize == operation->nqueues);
367 * Add an operation to a queue. An operation can be in multiple queues at
368 * once. Once the operation is inserted into all the queues
369 * GNUNET_TESTBED_operation_begin_wait_() has to be called to actually start
370 * waiting for the operation to become active. The operation is assumed to take
371 * 1 queue resource. Use GNUNET_TESTBED_operation_queue_insert2_() if it
372 * requires more than 1
374 * @param queue queue to add the operation to
375 * @param operation operation to add to the queue
378 GNUNET_TESTBED_operation_queue_insert_ (struct OperationQueue *queue,
379 struct GNUNET_TESTBED_Operation
382 return GNUNET_TESTBED_operation_queue_insert2_ (queue, operation, 1);
387 * Marks the given operation as waiting on the queues. Once all queues permit
388 * the operation to become active, the operation will be activated. The actual
389 * activation will occur in a separate task (thus allowing multiple queue
390 * insertions to be made without having the first one instantly trigger the
391 * operation if the first queue has sufficient resources).
393 * @param operation the operation to marks as waiting
396 GNUNET_TESTBED_operation_begin_wait_ (struct GNUNET_TESTBED_Operation
399 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == operation->start_task_id);
400 operation->state = OP_STATE_WAITING;
401 check_readiness (operation);
406 * Remove an operation from a queue. This can be because the
407 * oeration was active and has completed (and the resources have
408 * been released), or because the operation was cancelled and
409 * thus scheduling the operation is no longer required.
411 * @param queue queue to add the operation to
412 * @param operation operation to add to the queue
415 GNUNET_TESTBED_operation_queue_remove_ (struct OperationQueue *queue,
416 struct GNUNET_TESTBED_Operation
419 struct QueueEntry *entry;
420 struct QueueEntry *entry2;
422 for (entry = queue->head; NULL != entry; entry = entry->next)
423 if (entry->op == operation)
425 GNUNET_assert (NULL != entry);
426 GNUNET_assert (0 < entry->nres);
427 switch (operation->state)
430 case OP_STATE_WAITING:
433 case OP_STATE_STARTED:
434 GNUNET_assert (0 != queue->active);
435 GNUNET_assert (queue->active >= entry->nres);
436 queue->active -= entry->nres;
439 entry2 = entry->next;
440 GNUNET_CONTAINER_DLL_remove (queue->head, queue->tail, entry);
442 for (; NULL != entry2; entry2 = entry2->next)
443 if (OP_STATE_WAITING == entry2->op->state)
447 check_readiness (entry2->op);
452 * An operation is 'done' (was cancelled or finished); remove
453 * it from the queues and release associated resources.
455 * @param operation operation that finished
458 GNUNET_TESTBED_operation_release_ (struct GNUNET_TESTBED_Operation *operation)
462 if (GNUNET_SCHEDULER_NO_TASK != operation->start_task_id)
464 GNUNET_SCHEDULER_cancel (operation->start_task_id);
465 operation->start_task_id = GNUNET_SCHEDULER_NO_TASK;
467 for (i = 0; i < operation->nqueues; i++)
468 GNUNET_TESTBED_operation_queue_remove_ (operation->queues[i], operation);
469 GNUNET_free (operation->queues);
470 GNUNET_free (operation->nres);
471 if (NULL != operation->release)
472 operation->release (operation->cb_cls);
473 GNUNET_free (operation);
477 /* end of testbed_api_operations.c */