-/* Copyright (c) 2012-2019. The SimGrid Team. All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-/***************** Centralized Mutual Exclusion Algorithm *******************/
-/* This example implements a centralized mutual exclusion algorithm. */
-/* Bug : CS requests of client 1 not satisfied */
-/* LTL property checked : G(r->F(cs)); (r=request of CS, cs=CS ok) */
-/****************************************************************************/
-
-#ifdef GARBAGE_STACK
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#endif
-
-#include <simgrid/modelchecker.h>
-#include <simgrid/msg.h>
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(bugged1_liveness, "my log messages");
-
-int r=0;
-int cs=0;
-
-#ifdef GARBAGE_STACK
-/** Do not use a clean stack */
-static void garbage_stack(void) {
- const size_t size = 256;
- int fd = open("/dev/urandom", O_RDONLY);
- char foo[size];
- read(fd, foo, size);
- close(fd);
-}
-#endif
-
-static int coordinator(int argc, char *argv[])
-{
- int CS_used = 0;
- msg_task_t task = NULL;
- msg_task_t answer = NULL;
- xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL);
- char *req;
-
- while(1){
- MSG_task_receive(&task, "coordinator");
- const char *kind = MSG_task_get_name(task);
- if (!strcmp(kind, "request")) {
- req = MSG_task_get_data(task);
- if (CS_used) {
- XBT_INFO("CS already used. Queue the request.");
- xbt_dynar_push(requests, &req);
- } else {
- if(strcmp(req, "1") != 0){
- XBT_INFO("CS idle. Grant immediatly");
- answer = MSG_task_create("grant", 0, 1000, NULL);
- MSG_task_send(answer, req);
- CS_used = 1;
- answer = NULL;
- }
- }
- } else {
- if (!xbt_dynar_is_empty(requests)) {
- XBT_INFO("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests));
- xbt_dynar_shift(requests, &req);
- if(strcmp(req, "1") != 0){
- MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req);
- }else{
- xbt_dynar_push(requests, &req);
- CS_used = 0;
- }
- }else{
- XBT_INFO("CS release. resource now idle");
- CS_used = 0;
- }
- }
- MSG_task_destroy(task);
- task = NULL;
- kind = NULL;
- req = NULL;
- }
- return 0;
-}
-
-static int client(int argc, char *argv[])
-{
- int my_pid = MSG_process_get_PID(MSG_process_self());
-
- char *my_mailbox = xbt_strdup(argv[1]);
- msg_task_t grant = NULL;
- msg_task_t release = NULL;
-
- while(1){
- XBT_INFO("Ask the request");
- MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator");
-
- if(strcmp(my_mailbox, "1") == 0){
- r = 1;
- cs = 0;
- XBT_INFO("Propositions changed : r=1, cs=0");
- }
-
- MSG_task_receive(&grant, my_mailbox);
- const char *kind = MSG_task_get_name(grant);
-
- if((strcmp(my_mailbox, "1") == 0) && (strcmp("grant", kind) == 0)){
- cs = 1;
- r = 0;
- XBT_INFO("Propositions changed : r=0, cs=1");
- }
-
- MSG_task_destroy(grant);
- grant = NULL;
- kind = NULL;
-
- XBT_INFO("%s got the answer. Sleep a bit and release it", argv[1]);
-
- MSG_process_sleep(1);
-
- release = MSG_task_create("release", 0, 1000, NULL);
- MSG_task_send(release, "coordinator");
-
- release = NULL;
-
- MSG_process_sleep(my_pid);
-
- if(strcmp(my_mailbox, "1") == 0){
- cs=0;
- r=0;
- XBT_INFO("Propositions changed : r=0, cs=0");
- }
-
- }
- return 0;
-}
-
-static int raw_client(int argc, char *argv[])
-{
-#ifdef GARBAGE_STACK
- // At this point the stack of the callee (client) is probably filled with
- // zeros and uninitialized variables will contain 0. This call will place
- // random byes in the stack of the callee:
- garbage_stack();
-#endif
- return client(argc, argv);
-}
-
-int main(int argc, char *argv[])
-{
- MSG_init(&argc, argv);
-
- MC_automaton_new_propositional_symbol_pointer("r", &r);
- MC_automaton_new_propositional_symbol_pointer("cs", &cs);
-
- MSG_create_environment(argv[1]);
-
- MSG_function_register("coordinator", coordinator);
- MSG_function_register("client", raw_client);
- MSG_launch_application(argv[2]);
-
- MSG_main();
-
- return 0;
-}
