sstuff

Examples/concurrency/mutex2.c

@@ -4,33 +4,34 @@
  *            unlocked
  */
 
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <unistd.h>
-#include <pthread.h>
 
 // shared global
 static int counter1 = 0;
 static int counter2 = 0;
 
-// start flag 
+// start flag
 volatile int start;
 
 // flag mutex
 pthread_mutex_t flag = PTHREAD_MUTEX_INITIALIZER;
 
 // The thread process
-void* thread_routine(void* args)
+void *thread_routine(void *args)
 {
-    int me = *((int *) args);
+    int me = *((int *)args);
 
     int you = me ? 0 : 1;
 
-    printf("Worker thread: %d ready, you are %d\n",me,you);
+    printf("Worker thread: %d ready, you are %d\n", me, you);
 
     // wait for start from master thread
-    while(!start);
+    while (!start)
+        ;
 
     for (int j = 0; j < 1000000; j++)
     {
@@ -41,17 +42,17 @@ void* thread_routine(void* args)
         // leaving critical section
         pthread_mutex_unlock(&flag);
 
-        if(me == 0) {
+        if (me == 0)
+        {
             pthread_mutex_unlock(&flag);
         }
     }
 
-    printf("Worker thread: %d done\n",me);
+    printf("Worker thread: %d done\n", me);
 
     return NULL;
 }
 
-
 // Main process
 int main()
 {
@@ -60,22 +61,24 @@ int main()
 
     pthread_t thr1;
     pthread_t thr2;
-    if(pthread_create(&thr1, NULL, thread_routine, (void*)&val1) == -1) {
+    if (pthread_create(&thr1, NULL, thread_routine, (void *)&val1) == -1)
+    {
         printf("COULD NOT CREATE A THREAD\n");
         exit(EXIT_FAILURE);
     }
-    if(pthread_create(&thr2, NULL, thread_routine, (void*)&val2) == -1) {
+    if (pthread_create(&thr2, NULL, thread_routine, (void *)&val2) == -1)
+    {
         printf("COULD NOT CREATE A THREAD\n");
         exit(EXIT_FAILURE);
     }
 
     start = 1;
 
-    pthread_join(thr1,NULL);
-    pthread_join(thr2,NULL);
+    pthread_join(thr1, NULL);
+    pthread_join(thr2, NULL);
 
-    printf("counter1: %d\n",counter1);
-    printf("counter2: %d\n",counter2);
+    printf("counter1: %d\n", counter1);
+    printf("counter2: %d\n", counter2);
 
     pthread_mutex_destroy(&flag);
     return EXIT_SUCCESS;