1 /* gras message exchanges */
3 /* Copyright (c) 2003-2009. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "xbt/ex_interface.h"
10 #include "gras/Msg/msg_private.h"
11 #include "gras/Virtu/virtu_interface.h"
13 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_msg);
17 const char *e_gras_msg_kind_names[e_gras_msg_kind_count] =
18 { "UNKNOWN", "ONEWAY", "RPC call", "RPC answer", "RPC error" };
21 /** \brief Waits for a message to come in over a given socket.
23 * @param timeout: How long should we wait for this message.
24 * @param msgt_want: type of awaited msg (or NULL if I'm enclined to accept any message)
25 * @param expe_want: awaited expeditot (match on hostname, not port; NULL if not relevant)
26 * @param filter: function returning true or false when passed a payload. Messages for which it returns false are not selected. (NULL if not relevant)
27 * @param filter_ctx: context passed as second argument of the filter (a pattern to match?)
28 * @param[out] msg_got: where to write the message we got
30 * Every message of another type received before the one waited will be queued
31 * and used by subsequent call to this function or gras_msg_handle().
35 gras_msg_wait_ext_(double timeout,
36 gras_msgtype_t msgt_want,
37 gras_socket_t expe_want,
38 gras_msg_filter_t filter,
39 void *filter_ctx, gras_msg_t msg_got)
44 gras_msg_procdata_t pd =
45 (gras_msg_procdata_t) gras_libdata_by_id(gras_msg_libdata_id);
48 xbt_assert0(msg_got, "msg_got is an output parameter");
50 start = gras_os_time();
51 VERB2("Waiting for message '%s' for %fs",
52 msgt_want ? msgt_want->name : "(any)", timeout);
54 xbt_dynar_foreach(pd->msg_waitqueue, cpt, msg) {
55 if ((!msgt_want || (msg.type->code == msgt_want->code))
56 && (!expe_want || (!strcmp(gras_socket_peer_name(msg.expe),
57 gras_socket_peer_name(expe_want))))
58 && (!filter || filter(&msg, filter_ctx))) {
60 memcpy(msg_got, &msg, sizeof(s_gras_msg_t));
61 xbt_dynar_cursor_rm(pd->msg_waitqueue, &cpt);
62 VERB0("The waited message was queued");
67 xbt_dynar_foreach(pd->msg_queue, cpt, msg) {
68 if ((!msgt_want || (msg.type->code == msgt_want->code))
69 && (!expe_want || (!strcmp(gras_socket_peer_name(msg.expe),
70 gras_socket_peer_name(expe_want))))
71 && (!filter || filter(&msg, filter_ctx))) {
73 memcpy(msg_got, &msg, sizeof(s_gras_msg_t));
74 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
75 VERB0("The waited message was queued");
84 restart_receive: /* Goto here when the receive of a message failed */
87 memset(&msg, 0, sizeof(msg));
90 xbt_queue_shift_timed(pd->msg_received, &msg,
91 timeout ? timeout - now + start : 0);
94 if (e.category == system_error &&
95 !strncmp("Socket closed by remote side", e.msg,
96 strlen("Socket closed by remote side"))) {
104 goto restart_receive;
106 DEBUG0("Got a message from the socket");
108 if ((!msgt_want || (msg.type->code == msgt_want->code))
109 && (!expe_want || (!strcmp(gras_socket_peer_name(msg.expe),
110 gras_socket_peer_name(expe_want))))
111 && (!filter || filter(&msg, filter_ctx))) {
113 memcpy(msg_got, &msg, sizeof(s_gras_msg_t));
114 DEBUG0("Message matches expectations. Use it.");
117 DEBUG0("Message does not match expectations. Queue it.");
119 /* not expected msg type. Queue it for later */
120 xbt_dynar_push(pd->msg_queue, &msg);
122 now = gras_os_time();
123 if (now - start + 0.001 > timeout) {
124 THROW1(timeout_error, now - start + 0.001 - timeout,
125 "Timeout while waiting for msg '%s'",
126 msgt_want ? msgt_want->name : "(any)");
133 /** \brief Waits for a message to come in over a given socket.
135 * @param timeout: How long should we wait for this message.
136 * @param msgt_want: type of awaited msg
137 * @param[out] expeditor: where to create a socket to answer the incomming message
138 * @param[out] payload: where to write the payload of the incomming message
139 * @return the error code (or no_error).
141 * Every message of another type received before the one waited will be queued
142 * and used by subsequent call to this function or gras_msg_handle().
145 gras_msg_wait_(double timeout,
146 gras_msgtype_t msgt_want,
147 gras_socket_t * expeditor, void *payload)
151 gras_msg_wait_ext_(timeout, msgt_want, NULL, NULL, NULL, &msg);
153 if (msgt_want->ctn_type) {
155 "Message type '%s' convey a payload you must accept",
158 xbt_assert1(!payload,
159 "No payload was declared for message type '%s'",
164 memcpy(payload, msg.payl, msg.payl_size);
169 *expeditor = msg.expe;
172 static int gras_msg_wait_or_filter(gras_msg_t msg, void *ctx)
174 xbt_dynar_t dyn = (xbt_dynar_t) ctx;
175 int res = xbt_dynar_member(dyn, msg->type);
177 VERB1("Got matching message (type=%s)", msg->type->name);
179 VERB0("Got message not matching our expectations");
183 /** \brief Waits for a message to come in over a given socket.
185 * @param timeout: How long should we wait for this message.
186 * @param msgt_want: a dynar containing all accepted message type
187 * @param[out] ctx: the context of received message (in case it's a RPC call we want to answer to)
188 * @param[out] msgt_got: indice in the dynar of the type of the received message
189 * @param[out] payload: where to write the payload of the incomming message
190 * @return the error code (or no_error).
192 * Every message of a type not in the accepted list received before the one
193 * waited will be queued and used by subsequent call to this function or
196 * If you are interested in the context, pass the address of a s_gras_msg_cb_ctx_t variable.
198 void gras_msg_wait_or(double timeout,
199 xbt_dynar_t msgt_want,
200 gras_msg_cb_ctx_t * ctx, int *msgt_got, void *payload)
204 VERB1("Wait %f seconds for several message types", timeout);
205 gras_msg_wait_ext_(timeout,
207 &gras_msg_wait_or_filter, (void *) msgt_want, &msg);
209 if (msg.type->ctn_type) {
211 "Message type '%s' convey a payload you must accept",
214 /* don't check the other side since some of the types may have a payload */
215 if (payload && msg.type->ctn_type) {
216 memcpy(payload, msg.payl, msg.payl_size);
221 *ctx = gras_msg_cb_ctx_new(msg.expe, msg.type, msg.ID,
222 (msg.kind == e_gras_msg_kind_rpccall), 60);
225 *msgt_got = xbt_dynar_search(msgt_want, msg.type);
229 /** \brief Send the data pointed by \a payload as a message of type
230 * \a msgtype to the peer \a sock */
231 void gras_msg_send_(gras_socket_t sock, gras_msgtype_t msgtype, void *payload)
234 if (msgtype->ctn_type) {
236 "Message type '%s' convey a payload you must provide",
239 xbt_assert1(!payload,
240 "No payload was declared for message type '%s'",
244 DEBUG2("Send a oneway message of type '%s'. Payload=%p",
245 msgtype->name, payload);
246 gras_msg_send_ext(sock, e_gras_msg_kind_oneway, 0, msgtype, payload);
247 VERB2("Sent a oneway message of type '%s'. Payload=%p",
248 msgtype->name, payload);
251 /** @brief Handle all messages arriving within the given period
253 * @param period: How long to wait for incoming messages (in seconds)
255 * Messages are dealed with just like gras_msg_handle() would do. The
256 * difference is that gras_msg_handle() handles at most one message (or wait up
257 * to timeout second when no message arrives) while this function handles any
258 * amount of messages, and lasts the given period in any case.
260 void gras_msg_handleall(double period)
263 double begin = gras_os_time();
267 now = gras_os_time();
269 if (period - now + begin > 0)
270 gras_msg_handle(period - now + begin);
273 if (e.category != timeout_error)
274 RETHROW0("Error while waiting for messages: %s");
277 /* Epsilon to avoid numerical stability issues were the waited interval is so small that the global clock cannot notice the increment */
278 } while (period - now + begin > 0);
281 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
283 * @param timeOut: How long to wait for incoming messages (in seconds)
284 * @return the error code (or no_error).
286 * Any message arriving in the given interval is passed to the callbacks.
288 * @sa gras_msg_handleall().
290 void gras_msg_handle(double timeOut)
300 gras_msg_procdata_t pd =
301 (gras_msg_procdata_t) gras_libdata_by_id(gras_msg_libdata_id);
302 gras_cblist_t *list = NULL;
304 s_gras_msg_cb_ctx_t ctx;
306 int timerexpected, timeouted;
309 VERB1("Handling message within the next %.2fs", timeOut);
311 untiltimer = gras_msg_timer_handle();
312 DEBUG1("Next timer in %f sec", untiltimer);
313 if (untiltimer == 0.0) {
314 /* A timer was already elapsed and handled */
317 if (untiltimer != -1.0) {
319 timeOut = MIN(timeOut, untiltimer);
324 /* get a message (from the queue or from the net) */
326 if (xbt_dynar_length(pd->msg_queue)) {
327 DEBUG0("Get a message from the queue");
328 xbt_dynar_shift(pd->msg_queue, &msg);
331 xbt_queue_shift_timed(pd->msg_received, &msg, timeOut);
332 // msg.expe = gras_trp_select(timeOut);
335 if (e.category != timeout_error)
337 DEBUG0("Damn. Timeout while getting a message from the queue");
346 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
347 untiltimer = gras_msg_timer_handle();
348 if (untiltimer == 0.0) {
349 /* we served a timer, we're done */
352 xbt_assert1(untiltimer > 0, "Negative timer (%f). I'm 'puzzeled'",
355 ("No timer elapsed, in contrary to expectations (next in %f sec)",
357 THROW1(timeout_error, 0,
358 "No timer elapsed, in contrary to expectations (next in %f sec)",
363 /* select timeouted, and no timer elapsed. Nothing to do */
364 THROW1(timeout_error, 0, "No new message or timer (delay was %f)",
370 /* A message was already there or arrived in the meanwhile. handle it */
371 xbt_dynar_foreach(pd->cbl_list, cpt, list) {
372 if (list->id == msg.type->code) {
380 ("No callback for message '%s' (type:%s) from %s:%d. Queue it for later gras_msg_wait() use.",
381 msg.type->name, e_gras_msg_kind_names[msg.kind],
382 gras_socket_peer_name(msg.expe), gras_socket_peer_port(msg.expe));
383 xbt_dynar_push(pd->msg_waitqueue, &msg);
384 return; /* FIXME: maybe we should call ourselves again until the end of the timer or a proper msg is got */
387 ctx.expeditor = msg.expe;
389 ctx.msgtype = msg.type;
390 ctx.answer_due = (msg.kind == e_gras_msg_kind_rpccall);
393 case e_gras_msg_kind_oneway:
394 case e_gras_msg_kind_rpccall:
397 xbt_dynar_foreach(list->cbs, cpt, cb) {
400 ("Use the callback #%d (@%p) for incomming msg '%s' (payload_size=%d)",
401 cpt + 1, cb, msg.type->name, msg.payl_size);
402 if (!(*cb) (&ctx, msg.payl)) {
403 /* cb handled the message */
412 if (msg.type->kind == e_gras_msg_kind_rpccall) {
413 char *old_file = e.file;
414 /* The callback raised an exception, propagate it on the network */
416 /* Make sure we reduce the file name to its basename to avoid issues in tests */
417 char *new_file = strrchr(e.file, '/');
420 /* the exception is born on this machine */
421 e.host = (char *) gras_os_myname();
422 xbt_ex_setup_backtrace(&e);
424 INFO5("Propagate %s exception ('%s') from '%s' RPC cb back to %s:%d",
425 (e.remote ? "remote" : "local"),
428 gras_socket_peer_name(msg.expe),
429 gras_socket_peer_port(msg.expe));
430 if (XBT_LOG_ISENABLED(gras_msg, xbt_log_priority_verbose))
432 gras_msg_send_ext(msg.expe, e_gras_msg_kind_rpcerror,
433 msg.ID, msg.type, &e);
440 ("Callback #%d (@%p) to message '%s' (payload size: %d) raised an exception: %s",
441 cpt + 1, cb, msg.type->name, msg.payl_size);
445 xbt_assert1(!ctx.answer_due,
446 "Bug in user code: RPC callback to message '%s' didn't call gras_msg_rpcreturn",
450 ("BUGS BOTH IN USER CODE (RPC callback to message '%s' didn't call gras_msg_rpcreturn) "
451 "AND IN SIMGRID (process wasn't killed by an assert)",
454 THROW1(mismatch_error, 0,
455 "Message '%s' refused by all registered callbacks (maybe your callback misses a 'return 0' at the end)",
457 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
461 case e_gras_msg_kind_rpcanswer:
462 INFO3("Unexpected RPC answer discarded (type: %s; from:%s:%d)",
463 msg.type->name, gras_socket_peer_name(msg.expe),
464 gras_socket_peer_port(msg.expe));
465 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
468 case e_gras_msg_kind_rpcerror:
469 INFO3("Unexpected RPC error discarded (type: %s; from:%s:%d)",
470 msg.type->name, gras_socket_peer_name(msg.expe),
471 gras_socket_peer_port(msg.expe));
472 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
476 THROW1(unknown_error, 0,
477 "Cannot handle messages of kind %d yet", msg.type->kind);