/***************** 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) */
/******************************************************************************/
{
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);
- while (1) {
+ while(1){
MSG_task_receive(&task, "coordinator");
- XBT_INFO("task coordinator : %p", task);
const char *kind = MSG_task_get_name(task);
- XBT_INFO("kind coordinator : %p", kind);
if (!strcmp(kind, "request")) {
char *req = MSG_task_get_data(task);
- XBT_INFO("req coordinator : %p", req);
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");
- MC_compare();
answer = MSG_task_create("grant", 0, 1000, NULL);
- XBT_INFO("answer coordinator : %p", answer);
MSG_task_send(answer, req);
CS_used = 1;
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));
+ char *req;
+ xbt_dynar_pop(requests, &req);
+ if(strcmp(req, "1") != 0){
+ MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req);
+ }else{
+ xbt_dynar_push(requests, &req);
+ }
+ }else{
+ XBT_INFO("CS release. resource now idle");
+ CS_used = 0;
+ }
}
MSG_task_destroy(task);
task = NULL;
{
int my_pid = MSG_process_get_PID(MSG_process_self());
- char *my_mailbox = bprintf("%s", argv[1]);
- XBT_INFO("my mailbox client : %p", my_mailbox);
+ 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");
}
MSG_task_receive(&grant, my_mailbox);
- XBT_INFO("grant client : %p", grant);
const char *kind = MSG_task_get_name(grant);
- XBT_INFO("kind client : %p", kind);
if((strcmp(my_mailbox, "1") == 0) && (strcmp("grant", kind) == 0)){
cs = 1;
MSG_process_sleep(1);
release = MSG_task_create("release", 0, 1000, NULL);
- XBT_INFO("release coordinator : %p", release);
MSG_task_send(release, "coordinator");
release = NULL;