-/***************** Producer/Consumer Algorithm *************************/
-/* This example implements a producer/consumer algorithm. */
-/* If consumer work before producer, message is empty */
-/***********************************************************************/
-
+/***************************** Bugged2 ****************************************/
+/* This example implements a centralized mutual exclusion algorithm. */
+/* One client stay always in critical section */
+/* LTL property checked : !(GFcs) */
+/******************************************************************************/
#include "msg/msg.h"
#include "mc/mc.h"
#include "xbt/automaton.h"
#include "bugged2_liveness.h"
-XBT_LOG_NEW_DEFAULT_CATEGORY(bugged2_liveness, "my log messages");
-
-char* buffer;
-
-int consume = 0;
-int produce = 0;
-int cready = 0;
-int pready = 0;
+XBT_LOG_NEW_DEFAULT_CATEGORY(bugged3, "my log messages");
+
+int cs = 0;
-int predPready(){
- return pready;
+int predCS(){
+ return cs;
}
-int predCready(){
- return cready;
-}
-int predConsume(){
- return consume;
-}
-
-int predProduce(){
- return produce;
-}
+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);
- int CS_used = 0;
-
- while(1) {
- m_task_t task = NULL;
+ 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);
- if (!strcmp(kind, "request")) {
+ 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) {
- XBT_INFO("CS already used. Queue the request");
- xbt_dynar_push(requests, &req);
- } else {
- m_task_t answer = MSG_task_create("grant", 0, 1000, NULL);
- MSG_task_send(answer, req);
- CS_used = 1;
- XBT_INFO("CS idle. Grant immediatly");
- }
- } else {
- if (xbt_dynar_length(requests) > 0) {
- XBT_INFO("CS release. Grant to queued requests");
- char *req;
- xbt_dynar_pop(requests, &req);
- MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req);
- } else {
- XBT_INFO("CS_realase, ressource now idle");
- CS_used = 0;
+ if (CS_used) {
+ XBT_INFO("CS already used.");
+ msg_task_t answer = MSG_task_create("not grant", 0, 1000, NULL);
+ MSG_task_send(answer, req);
+ MC_compare();
+ } 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
+ XBT_INFO("CS release. resource now idle");
+ CS_used = 0;
}
-
MSG_task_destroy(task);
-
+ kind = NULL;
}
-
- return 0;
-
-}
-
-int producer(int argc, char *argv[])
-{
-
- char * my_mailbox = bprintf("%s", argv[1]);
- while(1) {
-
- /* Create message */
- const char *mess = "message";
-
- pready = 1;
- XBT_INFO("pready = 1");
-
- /* CS request */
- XBT_INFO("Producer ask the request");
- 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);
-
- /* Push message (size of buffer = 1) */
- buffer = strdup(mess);
-
- produce = 1;
- XBT_INFO("produce = 1");
-
- /* CS release */
- MSG_task_send(MSG_task_create("release", 0, 1000, my_mailbox), "coordinator");
-
- produce = 0;
- pready = 0;
-
- XBT_INFO("pready et produce = 0");
-
- }
-
return 0;
-
}
-int consumer(int argc, char *argv[])
+int client(int argc, char *argv[])
{
+ int my_pid = MSG_process_get_PID(MSG_process_self());
+ char *my_mailbox = bprintf("%s", argv[1]);
+ const char* kind;
+
+ while(1){
- char * my_mailbox = bprintf("%s", argv[1]);
- char *mess;
+ XBT_INFO("Client (%s) asks the request", my_mailbox);
+ MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox),
+ "coordinator");
+ msg_task_t answer = NULL;
+ MSG_task_receive(&answer, my_mailbox);
- while(1) {
+ kind = MSG_task_get_name(answer);
- /* CS request */
- XBT_INFO("Consumer ask the request");
- MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator");
-
- cready = 1;
- XBT_INFO("cready = 1");
-
- /* Wait the answer */
- m_task_t grant = NULL;
- MSG_task_receive(&grant, my_mailbox);
- MSG_task_destroy(grant);
-
- /* Pop message */
- mess = malloc(8*sizeof(char));
- mess = strdup(buffer);
- buffer[0] = '\0';
-
- /* Display message */
- XBT_INFO("Message : %s", mess);
- if(strcmp(mess, "") != 0){
- consume = 1;
- XBT_INFO("consume = 1");
- }
-
- /* CS release */
- MSG_task_send(MSG_task_create("release", 0, 1000, my_mailbox), "coordinator");
+ if (!strcmp(kind, "grant")) {
- free(mess);
+ XBT_INFO("Client (%s) got the answer (grant). Sleep a bit and release it", my_mailbox);
- consume = 0;
- cready = 0;
-
- XBT_INFO("cready et consume = 0");
+ if(!strcmp(my_mailbox, "1"))
+ cs = 1;
+
+ }else{
+
+ XBT_INFO("Client (%s) got the answer (not grant). Try again", my_mailbox);
+
+ }
+ MSG_task_destroy(answer);
+ kind = NULL;
+
+ MSG_process_sleep(my_pid);
}
return 0;
-
}
-
int main(int argc, char *argv[])
{
+
+ MSG_init(&argc, argv);
- buffer = malloc(8*sizeof(char));
- buffer[0]='\0';
-
- xbt_automaton_t a = MC_create_automaton("promela2_bugged2_liveness");
- xbt_new_propositional_symbol(a,"pready", &predPready);
- xbt_new_propositional_symbol(a,"cready", &predCready);
- xbt_new_propositional_symbol(a,"consume", &predConsume);
- xbt_new_propositional_symbol(a,"produce", &predProduce);
+ MSG_config("model-check/property","promela_bugged2_liveness");
+ MC_automaton_new_propositional_symbol("cs", &predCS);
- MSG_global_init(&argc, argv);
MSG_create_environment("../msg_platform.xml");
MSG_function_register("coordinator", coordinator);
- MSG_function_register("consumer", consumer);
- MSG_function_register("producer", producer);
+ MSG_function_register("client", client);
MSG_launch_application("deploy_bugged2_liveness.xml");
- MSG_main_liveness(a);
+ MSG_main();
return 0;
