3 /* messaging - Function related to messaging (code shared between RL and SG)*/
5 /* Copyright (c) 2003, 2004 Martin Quinson. 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 "gras/Msg/msg_private.h"
12 #include "gras/Virtu/virtu_interface.h"
13 #include "gras/DataDesc/datadesc_interface.h"
14 #include "gras/Transport/transport_interface.h" /* gras_select */
17 #define MIN(a,b) ((a) < (b) ? (a) : (b))
20 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gras_msg,gras,"High level messaging");
22 xbt_set_t _gras_msgtype_set = NULL;
23 static char *make_namev(const char *name, short int ver);
27 * Creating procdata for this module
29 static void *gras_msg_procdata_new() {
30 gras_msg_procdata_t res = xbt_new(s_gras_msg_procdata_t,1);
32 res->name = xbt_strdup("gras_msg");
34 res->msg_queue = xbt_dynar_new(sizeof(s_gras_msg_t), NULL);
35 res->cbl_list = xbt_dynar_new(sizeof(gras_cblist_t *),gras_cbl_free);
36 res->timers = xbt_dynar_new(sizeof(s_gras_timer_t), NULL);
42 * Freeing procdata for this module
44 static void gras_msg_procdata_free(void *data) {
45 gras_msg_procdata_t res = (gras_msg_procdata_t)data;
47 xbt_dynar_free(&( res->msg_queue ));
48 xbt_dynar_free(&( res->cbl_list ));
49 xbt_dynar_free(&( res->timers ));
58 int gras_msg_libdata_id;
59 void gras_msg_register() {
60 gras_msg_libdata_id = gras_procdata_add("gras_msg",gras_msg_procdata_new, gras_msg_procdata_free);
64 * Initialize this submodule.
66 void gras_msg_init(void) {
67 /* only initialize once */
68 if (_gras_msgtype_set != NULL)
71 VERB0("Initializing Msg");
73 _gras_msgtype_set = xbt_set_new();
75 memcpy(_GRAS_header,"GRAS", 4);
76 _GRAS_header[4]=GRAS_PROTOCOL_VERSION;
77 _GRAS_header[5]=(char)GRAS_THISARCH;
81 * Finalize the msg module
86 xbt_set_free(&_gras_msgtype_set);
92 void gras_msgtype_free(void *t) {
93 gras_msgtype_t msgtype=(gras_msgtype_t)t;
103 * Returns the versionned name of the message. If the version is 0, that's
104 * the name unchanged. Pay attention to this before free'ing the result.
106 static char *make_namev(const char *name, short int ver) {
112 namev = (char*)xbt_malloc(strlen(name)+2+3+1);
115 sprintf(namev,"%s_v%d",name,ver);
120 /** @brief declare a new message type of the given name. It only accepts the given datadesc as payload
122 * @param name: name as it should be used for logging messages (must be uniq)
123 * @param payload: datadescription of the payload
125 void gras_msgtype_declare(const char *name,
126 gras_datadesc_type_t payload) {
127 gras_msgtype_declare_v(name, 0, payload);
130 /** @brief declare a new versionned message type of the given name and payload
132 * @param name: name as it should be used for logging messages (must be uniq)
133 * @param version: something like versionning symbol
134 * @param payload: datadescription of the payload
136 * Registers a message to the GRAS mechanism. Use this version instead of
137 * gras_msgtype_declare when you change the semantic or syntax of a message and
138 * want your programs to be able to deal with both versions. Internally, each
139 * will be handled as an independent message type, so you can register
140 * differents for each of them.
143 gras_msgtype_declare_v(const char *name,
145 gras_datadesc_type_t payload) {
147 gras_msgtype_t msgtype=NULL;
148 char *namev=make_namev(name,version);
149 volatile int found = 0;
153 msgtype = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set,namev);
156 if (e.category != not_found_error)
162 VERB2("Re-register version %d of message '%s' (same payload, ignored).",
164 xbt_assert3(!gras_datadesc_type_cmp(msgtype->ctn_type, payload),
165 "Message %s re-registred with another payload (%s was %s)",
166 namev,gras_datadesc_get_name(payload),
167 gras_datadesc_get_name(msgtype->ctn_type));
169 return ; /* do really ignore it */
173 VERB3("Register version %d of message '%s' (payload: %s).",
174 version, name, gras_datadesc_get_name(payload));
176 msgtype = xbt_new(s_gras_msgtype_t,1);
177 msgtype->name = (namev == name ? strdup(name) : namev);
178 msgtype->name_len = strlen(namev);
179 msgtype->version = version;
180 msgtype->ctn_type = payload;
182 xbt_set_add(_gras_msgtype_set, (xbt_set_elm_t)msgtype,
186 /** @brief retrive an existing message type from its name. */
187 gras_msgtype_t gras_msgtype_by_name (const char *name) {
188 return gras_msgtype_by_namev(name,0);
191 /** @brief retrive an existing message type from its name and version. */
192 gras_msgtype_t gras_msgtype_by_namev(const char *name,
195 char *namev = make_namev(name,version);
197 res = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set, namev);
203 /** @brief retrive an existing message type from its name and version. */
204 gras_msgtype_t gras_msgtype_by_id(int id) {
205 return (gras_msgtype_t)xbt_set_get_by_id(_gras_msgtype_set, id);
208 /** \brief Waits for a message to come in over a given socket.
210 * @param timeout: How long should we wait for this message.
211 * @param msgt_want: type of awaited msg (or NULL if I'm enclined to accept any message)
212 * @param expe_want: awaited expeditot (match on hostname, not port; NULL if not relevant)
213 * @param payl_filter: function returning true or false when passed a payload. Messages for which it returns false are not selected. (NULL if not relevant)
214 * @param filter_ctx: context passed as second argument of the filter (a pattern to match?)
215 * @param[out] msgt_got: where to write the descriptor of the message we got
216 * @param[out] expe_got: where to create a socket to answer the incomming message
217 * @param[out] payl_got: where to write the payload of the incomming message
219 * Every message of another type received before the one waited will be queued
220 * and used by subsequent call to this function or gras_msg_handle().
224 gras_msg_wait_ext(double timeout,
225 gras_msgtype_t msgt_want,
226 gras_socket_t expe_want,
227 int_f_pvoid_pvoid_t payl_filter,
229 gras_msgtype_t *msgt_got,
230 gras_socket_t *expe_got,
235 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
238 xbt_assert0(msgt_want,"Cannot wait for the NULL message");
240 VERB1("Waiting for message '%s'",msgt_want->name);
242 start = now = gras_os_time();
244 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
245 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
246 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
247 gras_socket_peer_name(expe_want))))
248 && (!payl_filter || payl_filter(msg.payl,filter_ctx))) {
251 *expe_got = msg.expe;
253 *msgt_got = msg.type;
255 memcpy(payl_got, msg.payl, msg.payl_size);
257 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
258 VERB0("The waited message was queued");
264 memset(&msg,sizeof(msg),0);
266 msg.expe = gras_trp_select(timeout - now + start);
267 gras_msg_recv(msg.expe, &msg);
269 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
270 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
271 gras_socket_peer_name(expe_want))))
272 && (!payl_filter || payl_filter(msg.payl,filter_ctx))) {
277 *msgt_got = msg.type;
279 memcpy(payl_got, msg.payl, msg.payl_size);
284 /* not expected msg type. Queue it for later */
285 xbt_dynar_push(pd->msg_queue,&msg);
288 if (now - start + 0.001 < timeout) {
289 THROW1(timeout_error, now-start+0.001-timeout,
290 "Timeout while waiting for msg %s",msgt_want->name);
296 /** \brief Waits for a message to come in over a given socket.
298 * @param timeout: How long should we wait for this message.
299 * @param msgt_want: type of awaited msg
300 * @param[out] expeditor: where to create a socket to answer the incomming message
301 * @param[out] payload: where to write the payload of the incomming message
302 * @return the error code (or no_error).
304 * Every message of another type received before the one waited will be queued
305 * and used by subsequent call to this function or gras_msg_handle().
308 gras_msg_wait(double timeout,
309 gras_msgtype_t msgt_want,
310 gras_socket_t *expeditor,
313 return gras_msg_wait_ext(timeout,
314 msgt_want, NULL, NULL, NULL,
315 NULL, expeditor, payload);
319 /** \brief Send the data pointed by \a payload as a message of type
320 * \a msgtype to the peer \a sock */
322 gras_msg_send(gras_socket_t sock,
323 gras_msgtype_t msgtype,
326 gras_msg_send_ext(sock, e_gras_msg_kind_oneway, msgtype, payload);
329 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
331 * @param timeOut: How long to wait for incoming messages (in seconds)
332 * @return the error code (or no_error).
334 * Messages are passed to the callbacks.
337 gras_msg_handle(double timeOut) {
344 gras_socket_t expeditor=NULL;
346 gras_msgtype_t msgtype=NULL;
348 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
349 gras_cblist_t *list=NULL;
352 int timerexpected, timeouted;
355 VERB1("Handling message within the next %.2fs",timeOut);
357 untiltimer = gras_msg_timer_handle();
358 DEBUG2("[%.0f] Next timer in %f sec", gras_os_time(), untiltimer);
359 if (untiltimer == 0.0) {
360 /* A timer was already elapsed and handled */
363 if (untiltimer != -1.0) {
365 timeOut = MIN(timeOut, untiltimer);
370 /* get a message (from the queue or from the net) */
372 if (xbt_dynar_length(pd->msg_queue)) {
373 DEBUG0("Get a message from the queue");
374 xbt_dynar_shift(pd->msg_queue,&msg);
375 expeditor = msg.expe;
380 expeditor = gras_trp_select(timeOut);
382 if (e.category != timeout_error)
390 /* FIXME: if not the right kind, queue it and recall ourself or goto >:-) */
391 gras_msg_recv(expeditor, &msg);
395 RETHROW1("Error caught while receiving a message on select()ed socket %p: %s",
404 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
405 untiltimer = gras_msg_timer_handle();
406 if (untiltimer == 0.0) {
407 /* we served a timer, we're done */
410 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm 'puzzeled'", untiltimer);
411 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
413 THROW1(timeout_error,0,
414 "No timer elapsed, in contrary to expectations (next in %f sec)",
419 /* select timeouted, and no timer elapsed. Nothing to do */
420 THROW0(timeout_error, 0, "No new message or timer");
425 /* A message was already there or arrived in the meanwhile. handle it */
426 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
427 if (list->id == msgtype->code) {
434 INFO1("No callback for the incomming '%s' message. Discarded.",
436 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
440 xbt_dynar_foreach(list->cbs,cpt,cb) {
441 VERB3("Use the callback #%d (@%p) for incomming msg %s",
442 cpt+1,cb,msgtype->name);
443 if ((*cb)(expeditor,payload)) {
444 /* cb handled the message */
450 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
451 THROW1(mismatch_error,0,
452 "Message '%s' refused by all registered callbacks", msgtype->name);
456 gras_cbl_free(void *data){
457 gras_cblist_t *list=*(void**)data;
459 xbt_dynar_free(&( list->cbs ));
464 /** \brief Bind the given callback to the given message type
466 * Several callbacks can be attached to a given message type. The lastly added one will get the message first, and
467 * if it returns false, the message will be passed to the second one.
468 * And so on until one of the callbacks accepts the message.
471 gras_cb_register(gras_msgtype_t msgtype,
473 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
474 gras_cblist_t *list=NULL;
477 DEBUG2("Register %p as callback to '%s'",cb,msgtype->name);
479 /* search the list of cb for this message on this host (creating if NULL) */
480 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
481 if (list->id == msgtype->code) {
488 /* First cb? Create room */
489 list = xbt_new(gras_cblist_t,1);
490 list->id = msgtype->code;
491 list->cbs = xbt_dynar_new(sizeof(gras_msg_cb_t), NULL);
492 xbt_dynar_push(pd->cbl_list,&list);
495 /* Insert the new one into the set */
496 xbt_dynar_insert_at(list->cbs,0,&cb);
499 /** \brief Unbind the given callback from the given message type */
501 gras_cb_unregister(gras_msgtype_t msgtype,
504 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
506 gras_msg_cb_t cb_cpt;
510 /* search the list of cb for this message on this host */
511 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
512 if (list->id == msgtype->code) {
519 /* Remove it from the set */
521 xbt_dynar_foreach(list->cbs,cpt,cb_cpt) {
523 xbt_dynar_cursor_rm(list->cbs, &cpt);
529 VERB1("Ignoring removal of unexisting callback to msg id %d",