/***************** Centralized Mutual Exclusion Algorithm *********************/
/* This example implements a centralized mutual exclusion algorithm. */
-/* There is no bug on it, it is just provided to test the state space */
-/* reduction of DPOR. */
+/* CS requests of client 2 not satisfied */
/******************************************************************************/
#include "msg/msg.h"
#include "y.tab.c"
#define AMOUNT_OF_CLIENTS 2
-#define CS_PER_PROCESS 1
+#define CS_PER_PROCESS 4
XBT_LOG_NEW_DEFAULT_CATEGORY(example_liveness_with_cycle, "my log messages");
+
int p=0;
int q=0;
return q;
}
+
int coordinator(int argc, char *argv[])
{
xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL); // dynamic vector storing requests (which are char*)
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);
- //XBT_INFO("Req %s", req);
if (CS_used) { // need to push the request in the vector
- XBT_INFO("CS already used. Queue the request");
+ XBT_INFO("CS already used. Queue the request of client %d", atoi(req) +1);
xbt_dynar_push(requests, &req);
} else { // can serve it immediatly
- XBT_INFO("CS idle. Grant immediatly");
if(strcmp(req, "1") == 0){
m_task_t answer = MSG_task_create("grant", 0, 1000, NULL);
MSG_task_send(answer, req);
CS_used = 1;
- }else{
- m_task_t answer = MSG_task_create("notgrant", 0, 1000, NULL);
- MSG_task_send(answer, req);
+ XBT_INFO("CS idle. Grant immediatly");
}
-
}
} else { // that's a release. Check if someone was waiting for the lock
if (xbt_dynar_length(requests) > 0) {
- XBT_INFO("CS release. Grant to queued requests (queue size: %lu)",
- xbt_dynar_length(requests));
- char *req;
+ XBT_INFO("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests));
+ char *req ;
+ xbt_dynar_get_cpy(requests, (xbt_dynar_length(requests) - 1), &req);
if(strcmp(req, "1") == 0){
xbt_dynar_pop(requests, &req);
MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req);
todo--;
}else{
- xbt_dynar_pop(requests, &req);
- MSG_task_send(MSG_task_create("notgrant", 0, 1000, NULL), req);
- todo--;
+ CS_used = 0;
}
} else { // nobody wants it
XBT_INFO("CS release. resource now idle");
int client(int argc, char *argv[])
{
int my_pid = MSG_process_get_PID(MSG_process_self());
- // use my pid as name of mailbox to contact me
+
char *my_mailbox = bprintf("%s", argv[1]);
- // request the CS 2 times, sleeping a bit in between
int i;
+
+ // request the CS 4 times, sleeping a bit in between
for (i = 0; i < CS_PER_PROCESS; i++) {
- p = 1;
- q = 0;
+
XBT_INFO("Ask the request");
- MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox),
- "coordinator");
- if(strcmp(my_mailbox, "1") == 0){
+ MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator");
+
+ if(strcmp(my_mailbox, "2") == 0){
p = 1;
q = 0;
+ XBT_DEBUG("Propositions changed : p=1, q=0");
}
+
// wait the answer
m_task_t grant = NULL;
MSG_task_receive(&grant, my_mailbox);
- const char *kind = MSG_task_get_name(grant);
- if(!strcmp(kind, "grant")){
- if(strcmp(my_mailbox, "2") == 0){
- q = 1;
- p = 0;
- }
- //answers ++;
- MSG_task_destroy(grant);
- XBT_INFO("got the answer. Sleep a bit and release it");
- MSG_process_sleep(1);
- MSG_task_send(MSG_task_create("release", 0, 1000,NULL ),
- "coordinator");
- }else{
- MSG_task_destroy(grant);
- XBT_INFO("Negative answer");
- MSG_process_sleep(1);
- MSG_task_send(MSG_task_create("notrelease", 0, 1000,NULL ),
- "coordinator");
+
+ if(strcmp(my_mailbox, "2") == 0){
+ q = 1;
+ p = 0;
+ XBT_DEBUG("Propositions changed : p=0, q=1");
}
-
- MSG_process_sleep(my_pid);
+
+ MSG_task_destroy(grant);
+ XBT_INFO("%s got the answer. Sleep a bit and release it", argv[1]);
+ MSG_process_sleep(1);
+ MSG_task_send(MSG_task_create("release", 0, 1000, NULL), "coordinator");
+
+ MSG_process_sleep(my_pid);
+
+ if(strcmp(my_mailbox, "2") == 0){
+ q=0;
+ p=0;
+ XBT_DEBUG("Propositions changed : p=0, q=0");
+ }
+
}
- //XBT_INFO("Got all the CS I wanted (%s), quit now", my_mailbox);
+ XBT_INFO("Got all the CS I wanted (%s), quit now", my_mailbox);
return 0;
}
init();
yyparse();
automaton = get_automaton();
- xbt_propositional_symbol_t ps = xbt_new_propositional_symbol(automaton,"p", &predP);
- ps = xbt_new_propositional_symbol(automaton,"q", &predQ);
+ xbt_new_propositional_symbol(automaton,"p", &predP);
+ xbt_new_propositional_symbol(automaton,"q", &predQ);
MSG_global_init(&argc, argv);
MSG_create_environment("../msg_platform.xml");
MSG_function_register("coordinator", coordinator);
MSG_function_register("client", client);
MSG_launch_application("deploy_mutex2.xml");
- MSG_main_liveness_stateless(automaton);
- //MSG_main();
+ MSG_main_liveness_stateless(automaton, argv[0]);
return 0;
}
