"debut TD0"

2019-2020/S3T_TP_07_THREADS/Demonstrations/demo_mutex.c

@@ -0,0 +1,57 @@
+///********************************************************************/
+///* IUT NICE-COTE D'AZUR - Departement INFORMATIQUE - R. CHIGNOLI    */
+///* Module DUT M311                                Theme PTHREADS    */
+///********************************************************************/
+/// demo_mutex.c : Demonstration simple d'utilisation des
+///                pthreads-mutex rapides.
+///                Utiliser par exemple les s<>quences LU0 LL0 LULU0 LUUL0
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <assert.h>
+
+pthread_t filsA;
+pthread_mutex_t fastmutex = PTHREAD_MUTEX_INITIALIZER;
+char *sequence;
+
+void* action (void* name) {
+    int encore = 0;
+    while (sequence [encore] != '0') {
+       switch (sequence [encore]) {
+         case 'L': printf("L ... ");
+                 if (pthread_mutex_lock (&fastmutex) != 0)
+                 printf("... L PB.\n"); else printf("... L OK.\n"); break;
+         case 'U': printf("U ... ");
+                 if (pthread_mutex_unlock (&fastmutex) != 0)
+                 printf("... U PB.\n");  else printf("... U OK.\n"); break;
+         case 'X': printf("X ... ");
+                 if (pthread_mutex_destroy (&fastmutex) != 0)
+                 printf("... X PB.\n");  else printf("... X OK.\n"); break;
+         default: printf("... Commande incorrecte\n");
+       }
+     encore ++;
+  }
+  printf("... Bye\n");
+  return 0;
+}
+
+int main (int argc, char* argv[]) {
+    pthread_t filsA;
+    assert (argc ==2);
+    sequence = argv[1];
+    printf ("\nEssayer avec les sequences : LU0 LL0 LULU0 LUUL0\n\n");
+
+    if (pthread_create(&filsA, NULL, action, "filsA")) {x
+        perror("pthread_create");
+        exit(-1);
+        }
+
+    printf("\nPERE (Thread principal) : boucle infinie\n\n") ;
+    for(;;);
+    return (0);
+    }
+