+/***************** Centralized Mutual Exclusion Algorithm *********************/
+/* This example implements a centralized mutual exclusion algorithm. */
+/* LTL property checked : !(GFcs) */
+/******************************************************************************/
+
#include "msg/msg.h"
#include "mc/mc.h"
#include "xbt/automaton.h"
#include "centralized_liveness.h"
#include "y.tab.c"
-#define AMOUNT_OF_CLIENTS 2
-#define CS_PER_PROCESS 1
-
XBT_LOG_NEW_DEFAULT_CATEGORY(centralized, "my log messages");
-int cs2 = 0;
+int cs = 0;
-int predCS2(){
- return cs2;
+int predCS(){
+ return cs;
}
int coordinator(int argc, char *argv[])
{
- xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL); // dynamic vector storing requests (which are char*)
int CS_used = 0; // initially the CS is idle
while (1) {
const char *kind = MSG_task_get_name(task); //is it a request or a release?
if (!strcmp(kind, "request")) { // that's a request
char *req = MSG_task_get_data(task);
- if (CS_used) { // need to push the request in the vector
- XBT_INFO("CS already used. Queue the request");
- xbt_dynar_push(requests, &req);
+ if (CS_used) {
+ XBT_INFO("CS already used.");
+ m_task_t answer = MSG_task_create("not grant", 0, 1000, NULL);
+ MSG_task_send(answer, req);
} else { // can serve it immediatly
XBT_INFO("CS idle. Grant immediatly");
m_task_t answer = MSG_task_create("grant", 0, 1000, NULL);
CS_used = 1;
}
} else { // that's a release. Check if someone was waiting for the lock
- if (!xbt_dynar_is_empty(requests)) {
- XBT_INFO("CS release. Grant to queued requests (queue size: %lu)",
- xbt_dynar_length(requests));
- char *req;
- xbt_dynar_pop(requests, &req);
- MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req);
- } else { // nobody wants it
- XBT_INFO("CS release. resource now idle");
- CS_used = 0;
- }
+ XBT_INFO("CS release. resource now idle");
+ CS_used = 0;
}
MSG_task_destroy(task);
}
{
int my_pid = MSG_process_get_PID(MSG_process_self());
char *my_mailbox = bprintf("%s", argv[1]);
+ const char* kind;
while(1){
- if(!strcmp(my_mailbox, "2"))
- cs2 = 0;
-
- XBT_INFO("Client (%s) ask the request", my_mailbox);
+ XBT_INFO("Client (%s) asks the request", my_mailbox);
MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox),
"coordinator");
// wait the answer
- m_task_t grant = NULL;
- MSG_task_receive(&grant, my_mailbox);
- MSG_task_destroy(grant);
- XBT_INFO("got the answer. Sleep a bit and release it");
+ m_task_t answer = NULL;
+ MSG_task_receive(&answer, my_mailbox);
- if(!strcmp(my_mailbox, "2"))
- cs2 = 1;
+ kind = MSG_task_get_name(answer);
+
+ if (!strcmp(kind, "grant")) {
- MSG_process_sleep(1);
- MSG_task_send(MSG_task_create("release", 0, 1000, NULL),
- "coordinator");
+ XBT_INFO("Client (%s) got the answer (grant). Sleep a bit and release it", my_mailbox);
+
+ if(!strcmp(my_mailbox, "1"))
+ cs = 1;
+
+ /*MSG_process_sleep(my_pid);
+ MSG_task_send(MSG_task_create("release", 0, 1000, NULL),
+ "coordinator");
+ XBT_INFO("Client (%s) releases the CS", my_mailbox);
+
+ if(!strcmp(my_mailbox, "1"))
+ cs = 0;*/
+
+ }else{
+
+ XBT_INFO("Client (%s) got the answer (not grant). Try again", my_mailbox);
+
+ }
+
+ MSG_task_destroy(answer);
+
MSG_process_sleep(my_pid);
}
init();
yyparse();
automaton = get_automaton();
- xbt_new_propositional_symbol(automaton,"cs2", &predCS2);
+ xbt_new_propositional_symbol(automaton,"cs", &predCS);
MSG_global_init(&argc, argv);
MSG_create_environment("../msg_platform.xml");