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->msg_queue = xbt_dynar_new(sizeof(s_gras_msg_t), NULL);
31 res->cbl_list = xbt_dynar_new(sizeof(gras_cblist_t *),gras_cbl_free);
32 res->timers = xbt_dynar_new(sizeof(s_gras_timer_t), NULL);
38 * Freeing procdata for this module
40 static void gras_msg_procdata_free(void *data) {
41 gras_msg_procdata_t res = (gras_msg_procdata_t)data;
43 xbt_dynar_free(&( res->msg_queue ));
44 xbt_dynar_free(&( res->cbl_list ));
45 xbt_dynar_free(&( res->timers ));
53 void gras_msg_register() {
54 gras_procdata_add("gras_msg",gras_msg_procdata_new, gras_msg_procdata_free);
58 * Initialize this submodule.
60 void gras_msg_init(void) {
61 /* only initialize once */
62 if (_gras_msgtype_set != NULL)
65 VERB0("Initializing Msg");
67 _gras_msgtype_set = xbt_set_new();
69 memcpy(_GRAS_header,"GRAS", 4);
70 _GRAS_header[4]=GRAS_PROTOCOL_VERSION;
71 _GRAS_header[5]=(char)GRAS_THISARCH;
75 * Finalize the msg module
80 xbt_set_free(&_gras_msgtype_set);
86 void gras_msgtype_free(void *t) {
87 gras_msgtype_t msgtype=(gras_msgtype_t)t;
97 * Returns the versionned name of the message. If the version is 0, that's
98 * the name unchanged. Pay attention to this before free'ing the result.
100 static char *make_namev(const char *name, short int ver) {
106 namev = (char*)xbt_malloc(strlen(name)+2+3+1);
109 sprintf(namev,"%s_v%d",name,ver);
114 /** @brief declare a new message type of the given name. It only accepts the given datadesc as payload
116 * @param name: name as it should be used for logging messages (must be uniq)
117 * @param payload: datadescription of the payload
119 void gras_msgtype_declare(const char *name,
120 gras_datadesc_type_t payload) {
121 gras_msgtype_declare_v(name, 0, payload);
124 /** @brief declare a new versionned message type of the given name and payload
126 * @param name: name as it should be used for logging messages (must be uniq)
127 * @param version: something like versionning symbol
128 * @param payload: datadescription of the payload
130 * Registers a message to the GRAS mechanism. Use this version instead of
131 * gras_msgtype_declare when you change the semantic or syntax of a message and
132 * want your programs to be able to deal with both versions. Internally, each
133 * will be handled as an independent message type, so you can register
134 * differents for each of them.
137 gras_msgtype_declare_v(const char *name,
139 gras_datadesc_type_t payload) {
141 gras_msgtype_t msgtype=NULL;
142 char *namev=make_namev(name,version);
143 volatile int found = 0;
147 msgtype = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set,namev);
150 if (e.category != not_found_error)
156 VERB2("Re-register version %d of message '%s' (same payload, ignored).",
158 xbt_assert3(!gras_datadesc_type_cmp(msgtype->ctn_type, payload),
159 "Message %s re-registred with another payload (%s was %s)",
160 namev,gras_datadesc_get_name(payload),
161 gras_datadesc_get_name(msgtype->ctn_type));
163 return ; /* do really ignore it */
167 VERB3("Register version %d of message '%s' (payload: %s).",
168 version, name, gras_datadesc_get_name(payload));
170 msgtype = xbt_new(s_gras_msgtype_t,1);
171 msgtype->name = (namev == name ? strdup(name) : namev);
172 msgtype->name_len = strlen(namev);
173 msgtype->version = version;
174 msgtype->ctn_type = payload;
176 xbt_set_add(_gras_msgtype_set, (xbt_set_elm_t)msgtype,
180 /** @brief retrive an existing message type from its name. */
181 gras_msgtype_t gras_msgtype_by_name (const char *name) {
182 return gras_msgtype_by_namev(name,0);
185 /** @brief retrive an existing message type from its name and version. */
186 gras_msgtype_t gras_msgtype_by_namev(const char *name,
189 char *namev = make_namev(name,version);
191 res = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set, namev);
197 /** @brief retrive an existing message type from its name and version. */
198 gras_msgtype_t gras_msgtype_by_id(int id) {
199 return (gras_msgtype_t)xbt_set_get_by_id(_gras_msgtype_set, id);
202 /** \brief Waits for a message to come in over a given socket.
204 * @param timeout: How long should we wait for this message.
205 * @param msgt_want: type of awaited msg
206 * @param[out] expeditor: where to create a socket to answer the incomming message
207 * @param[out] payload: where to write the payload of the incomming message
208 * @return the error code (or no_error).
210 * Every message of another type received before the one waited will be queued
211 * and used by subsequent call to this function or gras_msg_handle().
214 gras_msg_wait(double timeout,
215 gras_msgtype_t msgt_want,
216 gras_socket_t *expeditor,
219 gras_msgtype_t msgt_got;
221 int payload_size_got;
223 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
226 gras_socket_t expeditor_res = NULL;
230 xbt_assert0(msgt_want,"Cannot wait for the NULL message");
232 VERB1("Waiting for message '%s'",msgt_want->name);
234 start = now = gras_os_time();
236 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
237 if (msg.type->code == msgt_want->code) {
239 *expeditor = msg.expeditor;
240 memcpy(payload, msg.payload, msg.payload_size);
242 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
243 VERB0("The waited message was queued");
249 expeditor_res = gras_trp_select(timeout - now + start);
250 gras_msg_recv(expeditor_res, &msgt_got, &payload_got, &payload_size_got);
251 if (msgt_got->code == msgt_want->code) {
253 *expeditor=expeditor_res;
254 memcpy(payload, payload_got, payload_size_got);
256 VERB0("Got waited message");
260 /* not expected msg type. Queue it for later */
261 msg.expeditor = expeditor_res;
263 msg.payload = payload;
264 msg.payload_size = payload_size_got;
265 xbt_dynar_push(pd->msg_queue,&msg);
268 if (now - start + 0.001 < timeout) {
269 THROW1(timeout_error, now-start+0.001-timeout,
270 "Timeout while waiting for msg %s",msgt_want->name);
277 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
279 * @param timeOut: How long to wait for incoming messages (in seconds)
280 * @return the error code (or no_error).
282 * Messages are passed to the callbacks.
285 gras_msg_handle(double timeOut) {
292 gras_socket_t expeditor=NULL;
295 gras_msgtype_t msgtype;
297 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
298 gras_cblist_t *list=NULL;
301 int timerexpected, timeouted;
304 VERB1("Handling message within the next %.2fs",timeOut);
306 untiltimer = gras_msg_timer_handle();
307 DEBUG2("[%.0f] Next timer in %f sec", gras_os_time(), untiltimer);
308 if (untiltimer == 0.0) {
309 /* A timer was already elapsed and handled */
312 if (untiltimer != -1.0) {
314 timeOut = MIN(timeOut, untiltimer);
319 /* get a message (from the queue or from the net) */
321 if (xbt_dynar_length(pd->msg_queue)) {
322 DEBUG0("Get a message from the queue");
323 xbt_dynar_shift(pd->msg_queue,&msg);
324 expeditor = msg.expeditor;
326 payload = msg.payload;
329 expeditor = gras_trp_select(timeOut);
331 if (e.category != timeout_error)
339 gras_msg_recv(expeditor, &msgtype, &payload, &payload_size);
341 RETHROW1("Error caught while receiving a message on select()ed socket %p: %s",
350 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
351 untiltimer = gras_msg_timer_handle();
352 if (untiltimer == 0.0) {
353 /* we served a timer, we're done */
356 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm 'puzzeled'", untiltimer);
357 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
359 THROW1(timeout_error,0,
360 "No timer elapsed, in contrary to expectations (next in %f sec)",
365 /* select timeouted, and no timer elapsed. Nothing to do */
366 THROW0(timeout_error, 0, "No new message or timer");
371 /* A message was already there or arrived in the meanwhile. handle it */
372 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
373 if (list->id == msgtype->code) {
380 INFO1("No callback for the incomming '%s' message. Discarded.",
382 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
386 xbt_dynar_foreach(list->cbs,cpt,cb) {
387 VERB3("Use the callback #%d (@%p) for incomming msg %s",
388 cpt+1,cb,msgtype->name);
389 if ((*cb)(expeditor,payload)) {
390 /* cb handled the message */
396 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
397 THROW1(mismatch_error,0,
398 "Message '%s' refused by all registered callbacks", msgtype->name);
402 gras_cbl_free(void *data){
403 gras_cblist_t *list=*(void**)data;
405 xbt_dynar_free(&( list->cbs ));
410 /** \brief Bind the given callback to the given message type
412 * Several callbacks can be attached to a given message type. The lastly added one will get the message first, and
413 * if it returns false, the message will be passed to the second one.
414 * And so on until one of the callbacks accepts the message.
417 gras_cb_register(gras_msgtype_t msgtype,
419 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
420 gras_cblist_t *list=NULL;
423 DEBUG2("Register %p as callback to '%s'",cb,msgtype->name);
425 /* search the list of cb for this message on this host (creating if NULL) */
426 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
427 if (list->id == msgtype->code) {
434 /* First cb? Create room */
435 list = xbt_new(gras_cblist_t,1);
436 list->id = msgtype->code;
437 list->cbs = xbt_dynar_new(sizeof(gras_msg_cb_t), NULL);
438 xbt_dynar_push(pd->cbl_list,&list);
441 /* Insert the new one into the set */
442 xbt_dynar_insert_at(list->cbs,0,&cb);
445 /** \brief Unbind the given callback from the given message type */
447 gras_cb_unregister(gras_msgtype_t msgtype,
450 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
452 gras_msg_cb_t cb_cpt;
456 /* search the list of cb for this message on this host */
457 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
458 if (list->id == msgtype->code) {
465 /* Remove it from the set */
467 xbt_dynar_foreach(list->cbs,cpt,cb_cpt) {
469 xbt_dynar_cursor_rm(list->cbs, &cpt);
475 VERB1("Ignoring removal of unexisting callback to msg id %d",