3 /* gras message exchanges */
5 /* Copyright (c) 2003-2009. The SimGrid Team. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include "xbt/ex_interface.h"
12 #include "gras/Msg/msg_private.h"
13 #include "gras/Virtu/virtu_interface.h"
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_msg);
19 const char *e_gras_msg_kind_names[e_gras_msg_kind_count]=
20 {"UNKNOWN","ONEWAY","RPC call","RPC answer","RPC error"};
23 /** \brief Waits for a message to come in over a given socket.
25 * @param timeout: How long should we wait for this message.
26 * @param msgt_want: type of awaited msg (or NULL if I'm enclined to accept any message)
27 * @param expe_want: awaited expeditot (match on hostname, not port; NULL if not relevant)
28 * @param filter: function returning true or false when passed a payload. Messages for which it returns false are not selected. (NULL if not relevant)
29 * @param filter_ctx: context passed as second argument of the filter (a pattern to match?)
30 * @param[out] msg_got: where to write the message we got
32 * Every message of another type received before the one waited will be queued
33 * and used by subsequent call to this function or gras_msg_handle().
37 gras_msg_wait_ext_(double timeout,
38 gras_msgtype_t msgt_want,
39 gras_socket_t expe_want,
40 gras_msg_filter_t filter,
47 gras_msg_procdata_t pd=
48 (gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
51 xbt_assert0(msg_got,"msg_got is an output parameter");
53 start = gras_os_time();
54 VERB2("Waiting for message '%s' for %fs",msgt_want?msgt_want->name:"(any)", timeout);
56 xbt_dynar_foreach(pd->msg_waitqueue,cpt,msg){
57 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
58 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
59 gras_socket_peer_name(expe_want))))
60 && (!filter || filter(&msg,filter_ctx))) {
62 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
63 xbt_dynar_cursor_rm(pd->msg_waitqueue, &cpt);
64 VERB0("The waited message was queued");
69 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
70 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
71 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
72 gras_socket_peer_name(expe_want))))
73 && (!filter || filter(&msg,filter_ctx))) {
75 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
76 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
77 VERB0("The waited message was queued");
86 restart_receive: /* Goto here when the receive of a message failed */
89 memset(&msg,sizeof(msg),0);
92 xbt_queue_shift_timed(pd->msg_received,&msg,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);
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)");
132 /** \brief Waits for a message to come in over a given socket.
134 * @param timeout: How long should we wait for this message.
135 * @param msgt_want: type of awaited msg
136 * @param[out] expeditor: where to create a socket to answer the incomming message
137 * @param[out] payload: where to write the payload of the incomming message
138 * @return the error code (or no_error).
140 * Every message of another type received before the one waited will be queued
141 * and used by subsequent call to this function or gras_msg_handle().
144 gras_msg_wait_(double timeout,
145 gras_msgtype_t msgt_want,
146 gras_socket_t *expeditor,
150 gras_msg_wait_ext_(timeout,
151 msgt_want, NULL, NULL, NULL,
154 if (msgt_want->ctn_type) {
156 "Message type '%s' convey a payload you must accept",
159 xbt_assert1(!payload,
160 "No payload was declared for message type '%s'",
165 memcpy(payload,msg.payl,msg.payl_size);
170 *expeditor = msg.expe;
173 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");
182 /** \brief Waits for a message to come in over a given socket.
184 * @param timeout: How long should we wait for this message.
185 * @param msgt_want: a dynar containing all accepted message type
186 * @param[out] ctx: the context of received message (in case it's a RPC call we want to answer to)
187 * @param[out] msgt_got: indice in the dynar of the type of the received message
188 * @param[out] payload: where to write the payload of the incomming message
189 * @return the error code (or no_error).
191 * Every message of a type not in the accepted list received before the one
192 * waited will be queued and used by subsequent call to this function or
195 * If you are interested in the context, pass the address of a s_gras_msg_cb_ctx_t variable.
197 void gras_msg_wait_or(double timeout,
198 xbt_dynar_t msgt_want,
199 gras_msg_cb_ctx_t *ctx,
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,
210 if (msg.type->ctn_type) {
212 "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 */
216 if (payload && msg.type->ctn_type) {
217 memcpy(payload,msg.payl,msg.payl_size);
222 *ctx=gras_msg_cb_ctx_new(msg.expe, msg.type, msg.ID,
223 (msg.kind == e_gras_msg_kind_rpccall), 60);
226 *msgt_got = xbt_dynar_search(msgt_want,msg.type);
230 /** \brief Send the data pointed by \a payload as a message of type
231 * \a msgtype to the peer \a sock */
233 gras_msg_send_(gras_socket_t sock,
234 gras_msgtype_t msgtype,
237 if (msgtype->ctn_type) {
239 "Message type '%s' convey a payload you must provide",
242 xbt_assert1(!payload,
243 "No payload was declared for message type '%s'",
247 DEBUG2("Send a oneway message of type '%s'. Payload=%p",
248 msgtype->name,payload);
249 gras_msg_send_ext(sock, e_gras_msg_kind_oneway,0, msgtype, payload);
250 VERB2("Sent a oneway message of type '%s'. Payload=%p",
251 msgtype->name,payload);
254 /** @brief Handle all messages arriving within the given period
256 * @param period: How long to wait for incoming messages (in seconds)
258 * Messages are dealed with just like gras_msg_handle() would do. The
259 * difference is that gras_msg_handle() handles at most one message (or wait up
260 * to timeout second when no message arrives) while this function handles any
261 * amount of messages, and lasts the given period in any case.
264 gras_msg_handleall(double period) {
266 double begin=gras_os_time();
272 if (period - now + begin > 0)
273 gras_msg_handle(period - now + begin);
275 if (e.category != timeout_error)
276 RETHROW0("Error while waiting for messages: %s");
279 /* Epsilon to avoid numerical stability issues were the waited interval is so small that the global clock cannot notice the increment */
280 } while (period - now + begin > 0);
283 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
285 * @param timeOut: How long to wait for incoming messages (in seconds)
286 * @return the error code (or no_error).
288 * Any message arriving in the given interval is passed to the callbacks.
290 * @sa gras_msg_handleall().
293 gras_msg_handle(double timeOut) {
302 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
303 gras_cblist_t *list=NULL;
305 s_gras_msg_cb_ctx_t ctx;
307 int timerexpected, timeouted;
310 VERB1("Handling message within the next %.2fs",timeOut);
312 untiltimer = gras_msg_timer_handle();
313 DEBUG1("Next timer in %f sec", untiltimer);
314 if (untiltimer == 0.0) {
315 /* A timer was already elapsed and handled */
318 if (untiltimer != -1.0) {
320 timeOut = MIN(timeOut, untiltimer);
325 /* get a message (from the queue or from the net) */
327 if (xbt_dynar_length(pd->msg_queue)) {
328 DEBUG0("Get a message from the queue");
329 xbt_dynar_shift(pd->msg_queue,&msg);
332 xbt_queue_shift_timed(pd->msg_received,&msg,timeOut);
333 // 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'", untiltimer);
353 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
355 THROW1(timeout_error,0,
356 "No timer elapsed, in contrary to expectations (next in %f sec)",
361 /* select timeouted, and no timer elapsed. Nothing to do */
362 THROW1(timeout_error, 0, "No new message or timer (delay was %f)",
368 /* A message was already there or arrived in the meanwhile. handle it */
369 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
370 if (list->id == msg.type->code) {
377 INFO4("No callback for message '%s' (type:%s) from %s:%d. Queue it for later gras_msg_wait() use.",
378 msg.type->name,e_gras_msg_kind_names[msg.kind],
379 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
380 xbt_dynar_push(pd->msg_waitqueue,&msg);
381 return; /* FIXME: maybe we should call ourselves again until the end of the timer or a proper msg is got */
384 ctx.expeditor = msg.expe;
386 ctx.msgtype = msg.type;
387 ctx.answer_due = (msg.kind == e_gras_msg_kind_rpccall);
390 case e_gras_msg_kind_oneway:
391 case e_gras_msg_kind_rpccall:
394 xbt_dynar_foreach(list->cbs,cpt,cb) {
396 DEBUG4("Use the callback #%d (@%p) for incomming msg '%s' (payload_size=%d)",
397 cpt+1,cb,msg.type->name,msg.payl_size);
398 if (!(*cb)(&ctx,msg.payl)) {
399 /* cb handled the message */
407 if (msg.type->kind == e_gras_msg_kind_rpccall) {
408 char *old_file=e.file;
409 /* The callback raised an exception, propagate it on the network */
411 /* Make sure we reduce the file name to its basename to avoid issues in tests */
412 char *new_file=strrchr(e.file,'/');
415 /* the exception is born on this machine */
416 e.host = (char*)gras_os_myname();
417 xbt_ex_setup_backtrace(&e);
419 INFO5("Propagate %s exception ('%s') from '%s' RPC cb back to %s:%d",
420 (e.remote ? "remote" : "local"),
423 gras_socket_peer_name(msg.expe),
424 gras_socket_peer_port(msg.expe));
425 if (XBT_LOG_ISENABLED(gras_msg,xbt_log_priority_verbose))
427 gras_msg_send_ext(msg.expe, e_gras_msg_kind_rpcerror,
428 msg.ID, msg.type, &e);
434 RETHROW4("Callback #%d (@%p) to message '%s' (payload size: %d) raised an exception: %s",
435 cpt+1,cb,msg.type->name,msg.payl_size);
439 xbt_assert1(! ctx.answer_due,
440 "Bug in user code: RPC callback to message '%s' didn't call gras_msg_rpcreturn",msg.type->name);
442 CRITICAL1("BUGS BOTH IN USER CODE (RPC callback to message '%s' didn't call gras_msg_rpcreturn) "
443 "AND IN SIMGRID (process wasn't killed by an assert)",msg.type->name);
445 THROW1(mismatch_error,0,
446 "Message '%s' refused by all registered callbacks (maybe your callback misses a 'return 0' at the end)", msg.type->name);
447 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
451 case e_gras_msg_kind_rpcanswer:
452 INFO3("Unexpected RPC answer discarded (type: %s; from:%s:%d)", msg.type->name,
453 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
454 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
457 case e_gras_msg_kind_rpcerror:
458 INFO3("Unexpected RPC error discarded (type: %s; from:%s:%d)", msg.type->name,
459 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
460 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
464 THROW1(unknown_error,0,
465 "Cannot handle messages of kind %d yet",msg.type->kind);