3 /* Copyright (c) 2009 Cristian Rosa.
4 All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_network, simix,
13 "Logging specific to SIMIX (network)");
15 /******************************************************************************/
16 /* Rendez-Vous Points */
17 /******************************************************************************/
20 * \brief Creates a new rendez-vous point
21 * \param name The name of the rendez-vous point
22 * \return The created rendez-vous point
24 smx_rdv_t SIMIX_rdv_create(const char *name)
26 smx_rdv_t rdv = xbt_new0(s_smx_rvpoint_t, 1);
27 rdv->name = name ? xbt_strdup(name) : NULL;
28 rdv->read = SIMIX_mutex_init();
29 rdv->write = SIMIX_mutex_init();
30 rdv->comm_fifo = xbt_fifo_new();
36 * \brief Destroy a rendez-vous point
37 * \param name The rendez-vous point to destroy
39 void SIMIX_rdv_destroy(smx_rdv_t rdv)
43 SIMIX_mutex_destroy(rdv->read);
44 SIMIX_mutex_destroy(rdv->write);
45 xbt_fifo_free(rdv->comm_fifo);
50 * \brief Push a communication request into a rendez-vous point
51 * \param rdv The rendez-vous point
52 * \param comm The communication request
54 static inline void SIMIX_rdv_push(smx_rdv_t rdv, smx_comm_t comm)
56 xbt_fifo_push(rdv->comm_fifo, comm);
61 * \brief Remove a communication request from a rendez-vous point
62 * \param rdv The rendez-vous point
63 * \param comm The communication request
65 static inline void SIMIX_rdv_remove(smx_rdv_t rdv, smx_comm_t comm)
67 xbt_fifo_remove(rdv->comm_fifo, comm);
72 * \brief Checks if there is a communication request queued in a rendez-vous matching our needs
73 * \param type The type of communication we are looking for (comm_send, comm_recv)
74 * \return The communication request if found, NULL otherwise.
76 smx_comm_t SIMIX_rdv_get_request(smx_rdv_t rdv, smx_comm_type_t type)
78 smx_comm_t comm = (smx_comm_t)xbt_fifo_get_item_content(
79 xbt_fifo_get_first_item(rdv->comm_fifo));
81 if(comm && comm->type == type){
82 DEBUG0("Communication request found!");
83 xbt_fifo_shift(rdv->comm_fifo);
84 SIMIX_communication_use(comm);
89 /* no relevant request found. Return NULL */
90 DEBUG0("Communication request not found");
95 * \brief counts the number of communication requests of a given host pending
96 * on a rendez-vous point
97 * \param rdv The rendez-vous point
98 * \param host The host to be counted
99 * \return The number of comm request pending in the rdv
102 SIMIX_rdv_get_count_waiting_comm(smx_rdv_t rdv, smx_host_t host)
104 smx_comm_t comm = NULL;
105 xbt_fifo_item_t item = NULL;
108 xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_comm_t) {
109 if (comm->src_proc->smx_host == host)
117 * \brief returns the communication at the head of the rendez-vous
118 * \param rdv The rendez-vous point
119 * \return The communication or NULL if empty
121 smx_comm_t SIMIX_rdv_get_head(smx_rdv_t rdv)
123 return (smx_comm_t)xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
126 /** @brief adds some API-related data to the rendez-vous point */
127 void SIMIX_rdv_set_data(smx_rdv_t rdv,void *data) {
130 /** @brief gets API-related data from the rendez-vous point */
131 void *SIMIX_rdv_get_data(smx_rdv_t rdv) {
135 /******************************************************************************/
136 /* Communication Requests */
137 /******************************************************************************/
140 * \brief Creates a new communication request
141 * \param type The type of communication (comm_send, comm_recv)
142 * \return The new communication request
144 smx_comm_t SIMIX_communication_new(smx_comm_type_t type)
146 /* alloc structures */
147 smx_comm_t comm = xbt_new0(s_smx_comm_t, 1);
149 comm->cond = SIMIX_cond_init();
156 * \brief Destroy a communication request
157 * \param comm The request to be destroyed
159 void SIMIX_communication_destroy(smx_comm_t comm)
162 if(comm->refcount > 0)
166 SIMIX_cond_destroy(comm->cond);
171 SIMIX_action_destroy(comm->act);
179 * \brief Increase the number of users of the communication.
180 * \param comm The communication request
181 * Each communication request can be used by more than one process, so it is
182 * necessary to know number of them at destroy time, to avoid freeing stuff that
183 * maybe is in use by others.
186 static inline void SIMIX_communication_use(smx_comm_t comm)
192 * \brief Start the simulation of a communication request
193 * \param comm The comm->rdv = NULL;communication request
195 static inline void SIMIX_communication_start(smx_comm_t comm)
197 /* If both the sender and the receiver are already there, start the communication */
198 if(comm->src_proc && comm->dst_proc){
199 DEBUG1("Starting communication %p", comm);
200 comm->act = SIMIX_action_communicate(comm->src_proc->smx_host,
201 comm->dst_proc->smx_host, NULL,
202 comm->task_size, comm->rate);
204 /* If any of the process is suspend, create the action but stop its execution,
205 it will be restart when the sender process resume */
206 if(SIMIX_process_is_suspended(comm->src_proc) ||
207 SIMIX_process_is_suspended(comm->dst_proc)) {
208 SIMIX_action_set_priority(comm->act, 0);
211 /* Add the communication as user data of the action */
212 comm->act->data = comm;
214 SIMIX_register_action_to_condition(comm->act, comm->cond);
219 * \brief Waits for communication completion and performs error checking
220 * \param comm The communication
221 * \param timeout The max amount of time to wait for the communication to finish
224 * - host_error if peer failed
225 * - timeout_error if communication reached the timeout specified
226 * - network_error if network failed or peer issued a timeout
228 static inline void SIMIX_communication_wait_for_completion(smx_comm_t comm, double timeout)
232 DEBUG1("Waiting for the completion of communication %p", comm);
236 SIMIX_cond_wait_timeout(comm->cond, NULL, timeout);
239 /* If there is a timeout then cancel the communication if it is running or
240 remove it from the rendez-vous otherwise. Then signal the other peer,
241 destroy the communication and retrow the exception. */
242 if(e.category == timeout_error){
243 DEBUG1("Communication timeout! %p", comm);
244 if(comm->act && SIMIX_action_get_state(comm->act) == SURF_ACTION_RUNNING)
245 SIMIX_communication_cancel(comm);
247 SIMIX_rdv_remove(comm->rdv, comm);
249 SIMIX_cond_signal(comm->cond);
250 SIMIX_communication_destroy(comm);
255 SIMIX_cond_wait(comm->cond, NULL);
258 DEBUG1("Communication %p complete! Let's check for errors", comm);
260 /* Check for errors other than timeouts (they are catched above) */
261 if(!SIMIX_host_get_state(SIMIX_host_self())){
263 SIMIX_rdv_remove(comm->rdv, comm);
264 SIMIX_communication_destroy(comm);
265 THROW0(host_error, 0, "Host failed");
266 } else if (SIMIX_action_get_state(comm->act) == SURF_ACTION_FAILED){
267 SIMIX_communication_destroy(comm);
268 THROW0(network_error, 0, "Link failure");
273 * \brief Cancels a communication
274 * \brief comm The communication to cancel
276 void SIMIX_communication_cancel(smx_comm_t comm)
278 SIMIX_action_cancel(comm->act);
282 * \brief get the amount remaining from the communication
283 * \param comm The communication
285 double SIMIX_communication_get_remains(smx_comm_t comm)
287 return SIMIX_action_get_remains(comm->act);
291 * \brief Copy the communication data from the sender's buffer to the receiver's one
292 * \param comm The communication
294 void SIMIX_network_copy_data(smx_comm_t comm)
296 /* If there is no data to be copy then return */
297 if(!comm->src_buff || !comm->dst_buff)
300 size_t src_buff_size = comm->src_buff_size;
301 size_t dst_buff_size = *comm->dst_buff_size;
303 /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
304 dst_buff_size = MIN(dst_buff_size, src_buff_size);
306 /* Update the receiver's buffer size to the copied amount */
307 if (comm->dst_buff_size)
308 *comm->dst_buff_size = dst_buff_size;
310 if(dst_buff_size == 0)
313 memcpy(comm->dst_buff, comm->src_buff, dst_buff_size);
315 DEBUG4("Copying comm %p data from %s -> %s (%zu bytes)",
316 comm, comm->src_proc->smx_host->name, comm->dst_proc->smx_host->name,
321 * \brief Return the user data associated to the communication
322 * \param comm The communication
323 * \return the user data
325 void *SIMIX_communication_get_data(smx_comm_t comm)
330 /******************************************************************************/
331 /* Synchronous Communication */
332 /******************************************************************************/
334 * \brief Put a send communication request in a rendez-vous point and waits for
335 * its completion (blocking)
336 * \param rdv The rendez-vous point
337 * \param task_size The size of the communication action (for surf simulation)
338 * \param rate The rate of the communication action (for surf)
339 * \param timeout The timeout used for the waiting the completion
340 * \param src_buff The source buffer containing the message to be sent
341 * \param src_buff_size The size of the source buffer
342 * \param comm_ref The communication object used for the send
343 * \param data User data associated to the communication object
345 * - host_error if peer failed
346 * - timeout_error if communication reached the timeout specified
347 * - network_error if network failed or peer issued a timeout
349 void SIMIX_network_send(smx_rdv_t rdv, double task_size, double rate,
350 double timeout, void *src_buff, size_t src_buff_size,
351 smx_comm_t *comm_ref, void *data)
355 /* Look for communication request matching our needs.
356 If it is not found then create it and push it into the rendez-vous point */
357 comm = SIMIX_rdv_get_request(rdv, comm_recv);
360 comm = SIMIX_communication_new(comm_send);
361 SIMIX_rdv_push(rdv, comm);
364 /* Update the communication reference with the comm to be used */
367 /* Setup the communication request */
368 comm->src_proc = SIMIX_process_self();
369 comm->task_size = task_size;
371 comm->src_buff = src_buff;
372 comm->src_buff_size = src_buff_size;
375 SIMIX_communication_start(comm);
377 /* Wait for communication completion */
378 SIMIX_communication_wait_for_completion(comm, timeout);
380 SIMIX_communication_destroy(comm);
384 * \brief Put a receive communication request in a rendez-vous point and waits
385 * for its completion (blocking)
386 * \param rdv The rendez-vous point
387 * \param timeout The timeout used for the waiting the completion
388 * \param dst_buff The destination buffer to copy the received message
389 * \param src_buff_size The size of the destination buffer
390 * \param comm_ref The communication object used for the send
392 * - host_error if peer failed
393 * - timeout_error if communication reached the timeout specified
394 * - network_error if network failed or peer issued a timeout
396 void SIMIX_network_recv(smx_rdv_t rdv, double timeout, void *dst_buff,
397 size_t *dst_buff_size, smx_comm_t *comm_ref)
401 /* Look for communication request matching our needs.
402 If it is not found then create it and push it into the rendez-vous point */
403 comm = SIMIX_rdv_get_request(rdv, comm_send);
406 comm = SIMIX_communication_new(comm_recv);
407 SIMIX_rdv_push(rdv, comm);
410 /* Update the communication reference with the comm to be used */
413 /* Setup communication request */
414 comm->dst_proc = SIMIX_process_self();
415 comm->dst_buff = dst_buff;
416 comm->dst_buff_size = dst_buff_size;
418 SIMIX_communication_start(comm);
420 /* Wait for communication completion */
421 SIMIX_communication_wait_for_completion(comm, timeout);
423 SIMIX_communication_destroy(comm);
426 /******************************************************************************/
427 /* Asynchronous Communication */
428 /******************************************************************************/
431 void SIMIX_network_wait(smx_action_t comm, double timeout)
436 XBT_PUBLIC(int) SIMIX_network_test(smx_action_t comm)