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 */
16 #define MIN(a,b) ((a) < (b) ? (a) : (b))
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gras_msg,gras,"High level messaging");
20 xbt_set_t _gras_msgtype_set = NULL;
21 static char *make_namev(const char *name, short int ver);
25 * Creating procdata for this module
27 static void *gras_msg_procdata_new() {
28 gras_msg_procdata_t res = xbt_new(s_gras_msg_procdata_t,1);
30 res->name = xbt_strdup("gras_msg");
32 res->msg_queue = xbt_dynar_new(sizeof(s_gras_msg_t), NULL);
33 res->cbl_list = xbt_dynar_new(sizeof(gras_cblist_t *),gras_cbl_free);
34 res->timers = xbt_dynar_new(sizeof(s_gras_timer_t), NULL);
40 * Freeing procdata for this module
42 static void gras_msg_procdata_free(void *data) {
43 gras_msg_procdata_t res = (gras_msg_procdata_t)data;
45 xbt_dynar_free(&( res->msg_queue ));
46 xbt_dynar_free(&( res->cbl_list ));
47 xbt_dynar_free(&( res->timers ));
55 int gras_msg_libdata_id;
56 void gras_msg_register() {
57 gras_msg_libdata_id = gras_procdata_add("gras_msg",gras_msg_procdata_new, gras_msg_procdata_free);
61 * Initialize this submodule.
63 void gras_msg_init(void) {
64 /* only initialize once */
65 if (_gras_msgtype_set != NULL)
68 VERB0("Initializing Msg");
70 _gras_msgtype_set = xbt_set_new();
72 memcpy(_GRAS_header,"GRAS", 4);
73 _GRAS_header[4]=GRAS_PROTOCOL_VERSION;
74 _GRAS_header[5]=(char)GRAS_THISARCH;
78 * Finalize the msg module
83 xbt_set_free(&_gras_msgtype_set);
89 void gras_msgtype_free(void *t) {
90 gras_msgtype_t msgtype=(gras_msgtype_t)t;
100 * Returns the versionned name of the message. If the version is 0, that's
101 * the name unchanged. Pay attention to this before free'ing the result.
103 static char *make_namev(const char *name, short int ver) {
109 namev = (char*)xbt_malloc(strlen(name)+2+3+1);
112 sprintf(namev,"%s_v%d",name,ver);
117 /** @brief declare a new message type of the given name. It only accepts the given datadesc as payload
119 * @param name: name as it should be used for logging messages (must be uniq)
120 * @param payload: datadescription of the payload
122 void gras_msgtype_declare(const char *name,
123 gras_datadesc_type_t payload) {
124 gras_msgtype_declare_v(name, 0, payload);
127 /** @brief declare a new versionned message type of the given name and payload
129 * @param name: name as it should be used for logging messages (must be uniq)
130 * @param version: something like versionning symbol
131 * @param payload: datadescription of the payload
133 * Registers a message to the GRAS mechanism. Use this version instead of
134 * gras_msgtype_declare when you change the semantic or syntax of a message and
135 * want your programs to be able to deal with both versions. Internally, each
136 * will be handled as an independent message type, so you can register
137 * differents for each of them.
140 gras_msgtype_declare_v(const char *name,
142 gras_datadesc_type_t payload) {
144 gras_msgtype_t msgtype=NULL;
145 char *namev=make_namev(name,version);
146 volatile int found = 0;
150 msgtype = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set,namev);
153 if (e.category != not_found_error)
159 VERB2("Re-register version %d of message '%s' (same payload, ignored).",
161 xbt_assert3(!gras_datadesc_type_cmp(msgtype->ctn_type, payload),
162 "Message %s re-registred with another payload (%s was %s)",
163 namev,gras_datadesc_get_name(payload),
164 gras_datadesc_get_name(msgtype->ctn_type));
166 return ; /* do really ignore it */
170 VERB3("Register version %d of message '%s' (payload: %s).",
171 version, name, gras_datadesc_get_name(payload));
173 msgtype = xbt_new(s_gras_msgtype_t,1);
174 msgtype->name = (namev == name ? strdup(name) : namev);
175 msgtype->name_len = strlen(namev);
176 msgtype->version = version;
177 msgtype->ctn_type = payload;
179 xbt_set_add(_gras_msgtype_set, (xbt_set_elm_t)msgtype,
183 /** @brief retrive an existing message type from its name. */
184 gras_msgtype_t gras_msgtype_by_name (const char *name) {
185 return gras_msgtype_by_namev(name,0);
188 /** @brief retrive an existing message type from its name and version. */
189 gras_msgtype_t gras_msgtype_by_namev(const char *name,
192 char *namev = make_namev(name,version);
194 res = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set, namev);
200 /** @brief retrive an existing message type from its name and version. */
201 gras_msgtype_t gras_msgtype_by_id(int id) {
202 return (gras_msgtype_t)xbt_set_get_by_id(_gras_msgtype_set, id);
205 /** \brief Waits for a message to come in over a given socket.
207 * @param timeout: How long should we wait for this message.
208 * @param msgt_want: type of awaited msg
209 * @param[out] expeditor: where to create a socket to answer the incomming message
210 * @param[out] payload: where to write the payload of the incomming message
211 * @return the error code (or no_error).
213 * Every message of another type received before the one waited will be queued
214 * and used by subsequent call to this function or gras_msg_handle().
217 gras_msg_wait(double timeout,
218 gras_msgtype_t msgt_want,
219 gras_socket_t *expeditor,
222 gras_msgtype_t msgt_got;
224 int payload_size_got;
226 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
229 gras_socket_t expeditor_res = NULL;
233 xbt_assert0(msgt_want,"Cannot wait for the NULL message");
235 VERB1("Waiting for message '%s'",msgt_want->name);
237 start = now = gras_os_time();
239 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
240 if (msg.type->code == msgt_want->code) {
242 *expeditor = msg.expeditor;
243 memcpy(payload, msg.payload, msg.payload_size);
245 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
246 VERB0("The waited message was queued");
252 expeditor_res = gras_trp_select(timeout - now + start);
253 gras_msg_recv(expeditor_res, &msgt_got, &payload_got, &payload_size_got);
254 if (msgt_got->code == msgt_want->code) {
256 *expeditor=expeditor_res;
257 memcpy(payload, payload_got, payload_size_got);
259 VERB0("Got waited message");
263 /* not expected msg type. Queue it for later */
264 msg.expeditor = expeditor_res;
266 msg.payload = payload;
267 msg.payload_size = payload_size_got;
268 xbt_dynar_push(pd->msg_queue,&msg);
271 if (now - start + 0.001 < timeout) {
272 THROW1(timeout_error, now-start+0.001-timeout,
273 "Timeout while waiting for msg %s",msgt_want->name);
280 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
282 * @param timeOut: How long to wait for incoming messages (in seconds)
283 * @return the error code (or no_error).
285 * Messages are passed to the callbacks.
288 gras_msg_handle(double timeOut) {
295 gras_socket_t expeditor=NULL;
298 gras_msgtype_t msgtype;
300 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
301 gras_cblist_t *list=NULL;
304 int timerexpected, timeouted;
307 VERB1("Handling message within the next %.2fs",timeOut);
309 untiltimer = gras_msg_timer_handle();
310 DEBUG2("[%.0f] Next timer in %f sec", gras_os_time(), untiltimer);
311 if (untiltimer == 0.0) {
312 /* A timer was already elapsed and handled */
315 if (untiltimer != -1.0) {
317 timeOut = MIN(timeOut, untiltimer);
322 /* get a message (from the queue or from the net) */
324 if (xbt_dynar_length(pd->msg_queue)) {
325 DEBUG0("Get a message from the queue");
326 xbt_dynar_shift(pd->msg_queue,&msg);
327 expeditor = msg.expeditor;
329 payload = msg.payload;
332 expeditor = gras_trp_select(timeOut);
334 if (e.category != timeout_error)
342 gras_msg_recv(expeditor, &msgtype, &payload, &payload_size);
344 RETHROW1("Error caught while receiving a message on select()ed socket %p: %s",
353 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
354 untiltimer = gras_msg_timer_handle();
355 if (untiltimer == 0.0) {
356 /* we served a timer, we're done */
359 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm 'puzzeled'", untiltimer);
360 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
362 THROW1(timeout_error,0,
363 "No timer elapsed, in contrary to expectations (next in %f sec)",
368 /* select timeouted, and no timer elapsed. Nothing to do */
369 THROW0(timeout_error, 0, "No new message or timer");
374 /* A message was already there or arrived in the meanwhile. handle it */
375 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
376 if (list->id == msgtype->code) {
383 INFO1("No callback for the incomming '%s' message. Discarded.",
385 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
389 xbt_dynar_foreach(list->cbs,cpt,cb) {
390 VERB3("Use the callback #%d (@%p) for incomming msg %s",
391 cpt+1,cb,msgtype->name);
392 if ((*cb)(expeditor,payload)) {
393 /* cb handled the message */
399 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
400 THROW1(mismatch_error,0,
401 "Message '%s' refused by all registered callbacks", msgtype->name);
405 gras_cbl_free(void *data){
406 gras_cblist_t *list=*(void**)data;
408 xbt_dynar_free(&( list->cbs ));
413 /** \brief Bind the given callback to the given message type
415 * Several callbacks can be attached to a given message type. The lastly added one will get the message first, and
416 * if it returns false, the message will be passed to the second one.
417 * And so on until one of the callbacks accepts the message.
420 gras_cb_register(gras_msgtype_t msgtype,
422 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
423 gras_cblist_t *list=NULL;
426 DEBUG2("Register %p as callback to '%s'",cb,msgtype->name);
428 /* search the list of cb for this message on this host (creating if NULL) */
429 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
430 if (list->id == msgtype->code) {
437 /* First cb? Create room */
438 list = xbt_new(gras_cblist_t,1);
439 list->id = msgtype->code;
440 list->cbs = xbt_dynar_new(sizeof(gras_msg_cb_t), NULL);
441 xbt_dynar_push(pd->cbl_list,&list);
444 /* Insert the new one into the set */
445 xbt_dynar_insert_at(list->cbs,0,&cb);
448 /** \brief Unbind the given callback from the given message type */
450 gras_cb_unregister(gras_msgtype_t msgtype,
453 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
455 gras_msg_cb_t cb_cpt;
459 /* search the list of cb for this message on this host */
460 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
461 if (list->id == msgtype->code) {
468 /* Remove it from the set */
470 xbt_dynar_foreach(list->cbs,cpt,cb_cpt) {
472 xbt_dynar_cursor_rm(list->cbs, &cpt);
478 VERB1("Ignoring removal of unexisting callback to msg id %d",