1 /* Copyright (c) 2012-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /***************************** Bugged2 ****************************************/
8 /* This example implements a centralized mutual exclusion algorithm. */
9 /* One client stay always in critical section */
10 /* LTL property checked : !(GFcs) */
11 /******************************************************************************/
13 #include "simgrid/msg.h"
16 XBT_LOG_NEW_DEFAULT_CATEGORY(bugged3, "my log messages");
20 static int coordinator(int argc, char *argv[])
22 int CS_used = 0; // initially the CS is idle
25 msg_task_t task = NULL;
26 MSG_task_receive(&task, "coordinator");
27 const char *kind = MSG_task_get_name(task); //is it a request or a release?
28 if (!strcmp(kind, "request")) { // that's a request
29 char *req = MSG_task_get_data(task);
31 XBT_INFO("CS already used.");
32 msg_task_t answer = MSG_task_create("not grant", 0, 1000, NULL);
33 MSG_task_send(answer, req);
34 } else { // can serve it immediately
35 XBT_INFO("CS idle. Grant immediately");
36 msg_task_t answer = MSG_task_create("grant", 0, 1000, NULL);
37 MSG_task_send(answer, req);
40 } else { // that's a release. Check if someone was waiting for the lock
41 XBT_INFO("CS release. resource now idle");
44 MSG_task_destroy(task);
51 static int client(int argc, char *argv[])
53 int my_pid = MSG_process_get_PID(MSG_process_self());
54 char *my_mailbox = xbt_strdup(argv[1]);
57 XBT_INFO("Client (%s) asks the request", my_mailbox);
58 MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator");
60 msg_task_t answer = NULL;
61 MSG_task_receive(&answer, my_mailbox);
63 const char* kind = MSG_task_get_name(answer);
65 if (!strcmp(kind, "grant")) {
66 XBT_INFO("Client (%s) got the answer (grant). Sleep a bit and release it", my_mailbox);
67 if(!strcmp(my_mailbox, "1"))
70 XBT_INFO("Client (%s) got the answer (not grant). Try again", my_mailbox);
73 MSG_task_destroy(answer);
76 MSG_process_sleep(my_pid);
81 int main(int argc, char *argv[])
83 MSG_init(&argc, argv);
85 MC_automaton_new_propositional_symbol_pointer("cs", &cs);
87 MSG_create_environment("../msg_platform.xml");
88 MSG_function_register("coordinator", coordinator);
89 MSG_function_register("client", client);
90 MSG_launch_application("deploy_bugged2_liveness.xml");