-/***************** 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"
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(centralized, "my log messages");
-
-int cs = 0;
-
-int predCS(){
- return cs;
-}
-
-
-int coordinator(int argc, char **argv);
-int client(int argc, char **argv);
-
-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) {
- msg_task_t task = NULL;
- MSG_task_receive(&task, "coordinator");
- 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);
- } else { // can serve it immediatly
- XBT_INFO("CS idle. Grant immediatly");
- msg_task_t answer = MSG_task_create("grant", 0, 1000, NULL);
- MSG_task_send(answer, req);
- 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;
- }
- }
- MSG_task_destroy(task);
- }
-
- return 0;
-}
-
-int client(int argc, char *argv[])
-{
- int my_pid = MSG_process_get_PID(MSG_process_self());
- char *my_mailbox = bprintf("%s", argv[1]);
-
- while(1){
-
- XBT_INFO("Client (%s) asks the request", my_mailbox);
- MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox),
- "coordinator");
- // wait the answer
- msg_task_t grant = NULL;
- MSG_task_receive(&grant, my_mailbox);
-
- MSG_task_destroy(grant);
- XBT_INFO("Client (%s) got the answer. 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;*/
-
- MSG_process_sleep(my_pid);
-
- }
-
- return 0;
-}
-
-int main(int argc, char *argv[])
-{
-
- MSG_init(&argc, argv);
-
- MSG_config("model-check/property","promela_centralized_liveness");
- MC_automaton_new_propositional_symbol("cs", &predCS);
-
- MSG_create_environment("../msg_platform.xml");
- MSG_function_register("coordinator", coordinator);
- MSG_function_register("client", client);
- MSG_launch_application("deploy_centralized_liveness.xml");
- MSG_main();
-
- return 0;
-
-}
