1 /***************** Centralized Mutual Exclusion Algorithm *********************/
2 /* This example implements a centralized mutual exclusion algorithm. */
3 /* Bug : CS requests of client 1 not satisfied */
4 /* LTL property checked : G(r->F(cs)); (r=request of CS, cs=CS ok) */
5 /******************************************************************************/
9 #include "xbt/automaton.h"
10 #include "bugged1_liveness.h"
12 XBT_LOG_NEW_DEFAULT_CATEGORY(bugged1_liveness, "my log messages");
26 int coordinator(int argc, char *argv[])
30 msg_task_t task = NULL, answer = NULL;
31 xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL);
34 MSG_task_receive(&task, "coordinator");
35 const char *kind = MSG_task_get_name(task);
36 if (!strcmp(kind, "request")) {
37 char *req = MSG_task_get_data(task);
39 XBT_INFO("CS already used. Queue the request.");
40 xbt_dynar_push(requests, &req);
42 if(strcmp(req, "1") != 0){
43 XBT_INFO("CS idle. Grant immediatly");
44 answer = MSG_task_create("grant", 0, 1000, NULL);
45 MSG_task_send(answer, req);
51 if (!xbt_dynar_is_empty(requests)) {
52 XBT_INFO("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests));
54 xbt_dynar_pop(requests, &req);
55 if(strcmp(req, "1") != 0){
56 MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req);
58 xbt_dynar_push(requests, &req);
61 XBT_INFO("CS release. resource now idle");
65 MSG_task_destroy(task);
73 int client(int argc, char *argv[])
75 int my_pid = MSG_process_get_PID(MSG_process_self());
77 char *my_mailbox = xbt_strdup(argv[1]);
78 msg_task_t grant = NULL, release = NULL;
81 XBT_INFO("Ask the request");
82 MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator");
84 if(strcmp(my_mailbox, "1") == 0){
87 XBT_INFO("Propositions changed : r=1, cs=0");
90 MSG_task_receive(&grant, my_mailbox);
91 const char *kind = MSG_task_get_name(grant);
93 if((strcmp(my_mailbox, "1") == 0) && (strcmp("grant", kind) == 0)){
96 XBT_INFO("Propositions changed : r=0, cs=1");
99 MSG_task_destroy(grant);
103 XBT_INFO("%s got the answer. Sleep a bit and release it", argv[1]);
105 MSG_process_sleep(1);
107 release = MSG_task_create("release", 0, 1000, NULL);
108 MSG_task_send(release, "coordinator");
112 MSG_process_sleep(my_pid);
114 if(strcmp(my_mailbox, "1") == 0){
117 XBT_INFO("Propositions changed : r=0, cs=0");
125 int main(int argc, char *argv[])
128 MSG_init(&argc, argv);
130 MSG_config("model-check/property","promela_bugged1_liveness");
131 MC_automaton_new_propositional_symbol("r", &predR);
132 MC_automaton_new_propositional_symbol("cs", &predCS);
134 MSG_create_environment("../msg_platform.xml");
135 MSG_function_register("coordinator", coordinator);
136 MSG_function_register("client", client);
137 MSG_launch_application("deploy_bugged1_liveness.xml");