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,
39 gras_msgtype_t msgt_want,
40 gras_socket_t expe_want,
41 gras_msg_filter_t filter,
48 gras_msg_procdata_t pd=
49 (gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
52 xbt_assert0(msg_got,"msg_got is an output parameter");
54 start = gras_os_time();
55 VERB2("Waiting for message '%s' for %fs",msgt_want?msgt_want->name:"(any)", timeout);
57 xbt_dynar_foreach(pd->msg_waitqueue,cpt,msg){
58 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
59 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
60 gras_socket_peer_name(expe_want))))
61 && (!filter || filter(&msg,filter_ctx))) {
63 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
64 xbt_dynar_cursor_rm(pd->msg_waitqueue, &cpt);
65 VERB0("The waited message was queued");
70 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
71 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
72 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
73 gras_socket_peer_name(expe_want))))
74 && (!filter || filter(&msg,filter_ctx))) {
76 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
77 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
78 VERB0("The waited message was queued");
87 restart_receive: /* Goto here when the receive of a message failed */
90 memset(&msg,sizeof(msg),0);
93 xbt_queue_shift_timed(pd->msg_received,&msg,timeout ? timeout - now + start : 0);
95 if (e.category == system_error &&
96 !strncmp("Socket closed by remote side",e.msg,
97 strlen("Socket closed by remote side"))) {
105 goto restart_receive;
107 DEBUG0("Got a message from the socket");
109 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
110 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
111 gras_socket_peer_name(expe_want))))
112 && (!filter || filter(&msg,filter_ctx))) {
114 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
115 DEBUG0("Message matches expectations. Use it.");
118 DEBUG0("Message does not match expectations. Queue it.");
120 /* not expected msg type. Queue it for later */
121 xbt_dynar_push(pd->msg_queue,&msg);
124 if (now - start + 0.001 > timeout) {
125 THROW1(timeout_error, now-start+0.001-timeout,
126 "Timeout while waiting for msg '%s'",
127 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,
151 gras_msg_wait_ext_(timeout,
152 msgt_want, NULL, NULL, NULL,
155 if (msgt_want->ctn_type) {
157 "Message type '%s' convey a payload you must accept",
160 xbt_assert1(!payload,
161 "No payload was declared for message type '%s'",
166 memcpy(payload,msg.payl,msg.payl_size);
171 *expeditor = msg.expe;
174 static int gras_msg_wait_or_filter(gras_msg_t msg, void *ctx) {
175 xbt_dynar_t dyn=(xbt_dynar_t)ctx;
176 int res = xbt_dynar_member(dyn,msg->type);
178 VERB1("Got matching message (type=%s)",msg->type->name);
180 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,
205 VERB1("Wait %f seconds for several message types",timeout);
206 gras_msg_wait_ext_(timeout,
208 &gras_msg_wait_or_filter, (void*)msgt_want,
211 if (msg.type->ctn_type) {
213 "Message type '%s' convey a payload you must accept",
215 } /* don't check the other side since some of the types may have a payload */
217 if (payload && msg.type->ctn_type) {
218 memcpy(payload,msg.payl,msg.payl_size);
223 *ctx=gras_msg_cb_ctx_new(msg.expe, msg.type, msg.ID,
224 (msg.kind == e_gras_msg_kind_rpccall), 60);
227 *msgt_got = xbt_dynar_search(msgt_want,msg.type);
231 /** \brief Send the data pointed by \a payload as a message of type
232 * \a msgtype to the peer \a sock */
234 gras_msg_send_(gras_socket_t sock,
235 gras_msgtype_t msgtype,
238 if (msgtype->ctn_type) {
240 "Message type '%s' convey a payload you must provide",
243 xbt_assert1(!payload,
244 "No payload was declared for message type '%s'",
248 DEBUG2("Send a oneway message of type '%s'. Payload=%p",
249 msgtype->name,payload);
250 gras_msg_send_ext(sock, e_gras_msg_kind_oneway,0, msgtype, payload);
251 VERB2("Sent a oneway message of type '%s'. Payload=%p",
252 msgtype->name,payload);
255 /** @brief Handle all messages arriving within the given period
257 * @param period: How long to wait for incoming messages (in seconds)
259 * Messages are dealed with just like gras_msg_handle() would do. The
260 * difference is that gras_msg_handle() handles at most one message (or wait up
261 * to timeout second when no message arrives) while this function handles any
262 * amount of messages, and lasts the given period in any case.
265 gras_msg_handleall(double period) {
267 double begin=gras_os_time();
273 if (period - now + begin > 0)
274 gras_msg_handle(period - now + begin);
276 if (e.category != timeout_error)
277 RETHROW0("Error while waiting for messages: %s");
280 /* Epsilon to avoid numerical stability issues were the waited interval is so small that the global clock cannot notice the increment */
281 } while (period - now + begin > 0);
284 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
286 * @param timeOut: How long to wait for incoming messages (in seconds)
287 * @return the error code (or no_error).
289 * Any message arriving in the given interval is passed to the callbacks.
291 * @sa gras_msg_handleall().
294 gras_msg_handle(double timeOut) {
303 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
304 gras_cblist_t *list=NULL;
306 s_gras_msg_cb_ctx_t ctx;
308 int timerexpected, timeouted;
311 VERB1("Handling message within the next %.2fs",timeOut);
313 untiltimer = gras_msg_timer_handle();
314 DEBUG1("Next timer in %f sec", untiltimer);
315 if (untiltimer == 0.0) {
316 /* A timer was already elapsed and handled */
319 if (untiltimer != -1.0) {
321 timeOut = MIN(timeOut, untiltimer);
326 /* get a message (from the queue or from the net) */
328 if (xbt_dynar_length(pd->msg_queue)) {
329 DEBUG0("Get a message from the queue");
330 xbt_dynar_shift(pd->msg_queue,&msg);
333 xbt_queue_shift_timed(pd->msg_received,&msg,timeOut);
334 // msg.expe = gras_trp_select(timeOut);
336 if (e.category != timeout_error)
338 DEBUG0("Damn. Timeout while getting a message from the queue");
347 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
348 untiltimer = gras_msg_timer_handle();
349 if (untiltimer == 0.0) {
350 /* we served a timer, we're done */
353 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm 'puzzeled'", untiltimer);
354 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
356 THROW1(timeout_error,0,
357 "No timer elapsed, in contrary to expectations (next in %f sec)",
362 /* select timeouted, and no timer elapsed. Nothing to do */
363 THROW1(timeout_error, 0, "No new message or timer (delay was %f)",
369 /* A message was already there or arrived in the meanwhile. handle it */
370 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
371 if (list->id == msg.type->code) {
378 INFO3("No callback for message '%s' from %s:%d. Queue it for later gras_msg_wait() use.",
380 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
381 xbt_dynar_push(pd->msg_waitqueue,&msg);
382 return; /* FIXME: maybe we should call ourselves again until the end of the timer or a proper msg is got */
385 ctx.expeditor = msg.expe;
387 ctx.msgtype = msg.type;
388 ctx.answer_due = (msg.kind == e_gras_msg_kind_rpccall);
391 case e_gras_msg_kind_oneway:
392 case e_gras_msg_kind_rpccall:
395 xbt_dynar_foreach(list->cbs,cpt,cb) {
397 DEBUG4("Use the callback #%d (@%p) for incomming msg '%s' (payload_size=%d)",
398 cpt+1,cb,msg.type->name,msg.payl_size);
399 if (!(*cb)(&ctx,msg.payl)) {
400 /* cb handled the message */
408 if (msg.type->kind == e_gras_msg_kind_rpccall) {
409 char *old_file=e.file;
410 /* The callback raised an exception, propagate it on the network */
412 /* Make sure we reduce the file name to its basename to avoid issues in tests */
413 char *new_file=strrchr(e.file,'/');
416 /* the exception is born on this machine */
417 e.host = (char*)gras_os_myname();
418 xbt_ex_setup_backtrace(&e);
420 INFO5("Propagate %s exception ('%s') from '%s' RPC cb back to %s:%d",
421 (e.remote ? "remote" : "local"),
424 gras_socket_peer_name(msg.expe),
425 gras_socket_peer_port(msg.expe));
426 if (XBT_LOG_ISENABLED(gras_msg,xbt_log_priority_verbose))
428 gras_msg_send_ext(msg.expe, e_gras_msg_kind_rpcerror,
429 msg.ID, msg.type, &e);
435 RETHROW4("Callback #%d (@%p) to message '%s' (payload size: %d) raised an exception: %s",
436 cpt+1,cb,msg.type->name,msg.payl_size);
440 xbt_assert1(! ctx.answer_due,
441 "Bug in user code: RPC callback to message '%s' didn't call gras_msg_rpcreturn",msg.type->name);
443 CRITICAL1("BUGS BOTH IN USER CODE (RPC callback to message '%s' didn't call gras_msg_rpcreturn) "
444 "AND IN SIMGRID (process wasn't killed by an assert)",msg.type->name);
446 THROW1(mismatch_error,0,
447 "Message '%s' refused by all registered callbacks (maybe your callback misses a 'return 0' at the end)", msg.type->name);
448 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
452 case e_gras_msg_kind_rpcanswer:
453 INFO3("Unexpected RPC answer discarded (type: %s; from:%s:%d)", msg.type->name,
454 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
455 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
458 case e_gras_msg_kind_rpcerror:
459 INFO3("Unexpected RPC error discarded (type: %s; from:%s:%d)", msg.type->name,
460 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
461 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
465 THROW1(unknown_error,0,
466 "Cannot handle messages of kind %d yet",msg.type->kind);