X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/dc3c3416c4cca30fef7c29422d45094687f59893..539916de848562683cf2e5425d5160c2a43f135a:/examples/msg/mc/bugged1_liveness.c

diff --git a/examples/msg/mc/bugged1_liveness.c b/examples/msg/mc/bugged1_liveness.c
index 7fc5066c19..5143623f2e 100644
--- a/examples/msg/mc/bugged1_liveness.c
+++ b/examples/msg/mc/bugged1_liveness.c
@@ -1,9 +1,21 @@
+/* Copyright (c) 2012-2014. 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.          */
-/* CS requests of client 1 not satisfied                                      */
+/* 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 "msg/msg.h"
 #include "mc/mc.h"
 #include "xbt/automaton.h"
@@ -22,22 +34,35 @@ int predCS(){
   return cs;
 }
 
+#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
 
 int coordinator(int argc, char *argv[])
 {
 
   int CS_used = 0;   
-  msg_task_t task = NULL, answer = NULL;        
+  msg_task_t task = NULL, answer = NULL; 
+  xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL);
+  char *req;
 
-  while (1) {
+  while(1){  
     MSG_task_receive(&task, "coordinator");
     const char *kind = MSG_task_get_name(task); 
     if (!strcmp(kind, "request")) {    
-      char *req = MSG_task_get_data(task);
+      req = MSG_task_get_data(task);
       if (CS_used) {           
-        XBT_INFO("CS already used.");
+        XBT_INFO("CS already used. Queue the request.");
+        xbt_dynar_push(requests, &req);
       } else {               
-        if(strcmp(req, "2") == 0){
+        if(strcmp(req, "1") != 0){
           XBT_INFO("CS idle. Grant immediatly");
           answer = MSG_task_create("grant", 0, 1000, NULL);
           MSG_task_send(answer, req);
@@ -45,13 +70,25 @@ int coordinator(int argc, char *argv[])
           answer = NULL;
         }
       }
-    } else {         
-      XBT_INFO("CS release. resource now idle");
-      CS_used = 0;
+    } 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;
@@ -64,9 +101,7 @@ int client(int argc, char *argv[])
   char *my_mailbox = xbt_strdup(argv[1]);
   msg_task_t grant = NULL, release = NULL;
 
-
-  while(1) {
-      
+  while(1){
     XBT_INFO("Ask the request");
     MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator");
 
@@ -111,19 +146,35 @@ int client(int argc, char *argv[])
   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 unitialized 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);
 
+  char **options = &argv[1];
+
   MSG_config("model-check/property","promela_bugged1_liveness");
   MC_automaton_new_propositional_symbol("r", &predR);
   MC_automaton_new_propositional_symbol("cs", &predCS);
+
+  const char* platform_file = options[0];
+  const char* application_file = options[1];
   
-  MSG_create_environment("../msg_platform.xml");
+  MSG_create_environment(platform_file);
   MSG_function_register("coordinator", coordinator);
-  MSG_function_register("client", client);
-  MSG_launch_application("deploy_bugged1_liveness.xml");
+  MSG_function_register("client", raw_client);
+  MSG_launch_application(application_file);
   MSG_main();
 
   return 0;