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3 (C) 2008--2012 Christian Grothoff (and other contributing authors)
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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.
79 * The operation is currently waiting for resources
84 * The operation has started
93 * Opaque handle to an abstract operation to be executed by the testing framework.
95 struct GNUNET_TESTBED_Operation
98 * Function to call when we have the resources to begin the operation.
100 OperationStart start;
103 * Function to call to clean up after the operation (which may or may
104 * not have been started yet).
106 OperationRelease release;
109 * Closure for callbacks.
114 * Array of operation queues this Operation belongs to.
116 struct OperationQueue **queues;
119 * The id of the task which calls OperationStart for this operation
121 GNUNET_SCHEDULER_TaskIdentifier start_task_id;
124 * Number of queues in the operation queues array
126 unsigned int nqueues;
129 * The state of the operation
131 enum OperationState state;
137 * Task for calling OperationStart on operation
139 * @param cls the Operation
140 * @param tc the TaskContext from scheduler
143 call_start (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
145 struct GNUNET_TESTBED_Operation *op = cls;
147 op->start_task_id = GNUNET_SCHEDULER_NO_TASK;
148 op->state = OP_STATE_STARTED;
149 if (NULL != op->start)
151 op->start (op->cb_cls);
157 * Checks for the readiness of an operation and schedules a operation start task
159 * @param op the operation
162 check_readiness (struct GNUNET_TESTBED_Operation *op)
166 for (i = 0; i < op->nqueues; i++)
168 if (0 == op->queues[i]->active)
171 for (i = 0; i < op->nqueues; i++)
173 op->queues[i]->active--;
175 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == op->start_task_id);
176 op->start_task_id = GNUNET_SCHEDULER_add_now (&call_start, op);
181 * Create an 'operation' to be performed.
183 * @param cls closure for the callbacks
184 * @param start function to call to start the operation
185 * @param release function to call to close down the operation
186 * @return handle to the operation
188 struct GNUNET_TESTBED_Operation *
189 GNUNET_TESTBED_operation_create_ (void *cls,
190 OperationStart start,
191 OperationRelease release)
193 struct GNUNET_TESTBED_Operation *op;
195 op = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Operation));
197 op->release = release;
204 * Create an operation queue.
206 * @param max_active maximum number of operations in this
207 * queue that can be active in parallel at the same time
208 * @return handle to the queue
210 struct OperationQueue *
211 GNUNET_TESTBED_operation_queue_create_ (unsigned int max_active)
213 struct OperationQueue *queue;
215 queue = GNUNET_malloc (sizeof (struct OperationQueue));
216 queue->active = max_active;
222 * Destroy an operation queue. The queue MUST be empty
225 * @param queue queue to destroy
228 GNUNET_TESTBED_operation_queue_destroy_ (struct OperationQueue *queue)
230 GNUNET_break (NULL == queue->head);
231 GNUNET_break (NULL == queue->tail);
237 * Add an operation to a queue. An operation can be in multiple
238 * queues at once. Once all queues permit the operation to become
239 * active, the operation will be activated. The actual activation
240 * will occur in a separate task (thus allowing multiple queue
241 * insertions to be made without having the first one instantly
242 * trigger the operation if the first queue has sufficient
245 * @param queue queue to add the operation to
246 * @param operation operation to add to the queue
249 GNUNET_TESTBED_operation_queue_insert_ (struct OperationQueue *queue,
250 struct GNUNET_TESTBED_Operation *operation)
252 struct QueueEntry *entry;
254 entry = GNUNET_malloc (sizeof (struct QueueEntry));
255 entry->op = operation;
256 GNUNET_CONTAINER_DLL_insert_tail (queue->head, queue->tail, entry);
258 GNUNET_realloc (operation->queues,
259 sizeof (struct OperationQueue *) * (++operation->nqueues));
260 operation->queues[operation->nqueues - 1] = queue;
261 check_readiness (operation);
266 * Remove an operation from a queue. This can be because the
267 * oeration was active and has completed (and the resources have
268 * been released), or because the operation was cancelled and
269 * thus scheduling the operation is no longer required.
271 * @param queue queue to add the operation to
272 * @param operation operation to add to the queue
275 GNUNET_TESTBED_operation_queue_remove_ (struct OperationQueue *queue,
276 struct GNUNET_TESTBED_Operation *operation)
278 struct QueueEntry *entry;
279 struct QueueEntry *entry2;
281 for (entry = queue->head; NULL != entry; entry = entry->next)
282 if (entry->op == operation)
284 GNUNET_assert (NULL != entry);
285 if (OP_STATE_STARTED == operation->state)
287 entry2 = entry->next;
288 GNUNET_CONTAINER_DLL_remove (queue->head, queue->tail, entry);
290 for (; NULL != entry2; entry2 = entry2->next)
291 if (OP_STATE_STARTED != entry2->op->state)
295 check_readiness (entry2->op);
300 * An operation is 'done' (was cancelled or finished); remove
301 * it from the queues and release associated resources.
303 * @param operation operation that finished
306 GNUNET_TESTBED_operation_release_ (struct GNUNET_TESTBED_Operation *operation)
310 if (GNUNET_SCHEDULER_NO_TASK != operation->start_task_id)
312 GNUNET_SCHEDULER_cancel (operation->start_task_id);
313 operation->start_task_id = GNUNET_SCHEDULER_NO_TASK;
315 for (i = 0; i < operation->nqueues; i++)
316 GNUNET_TESTBED_operation_queue_remove_ (operation->queues[i], operation);
317 GNUNET_free (operation->queues);
318 if (NULL != operation->release)
319 operation->release (operation->cb_cls);
320 GNUNET_free (operation);
324 /* end of testbed_api_operations.c */