sstuff

Examples/concurrency/race.c

@@ -1,68 +1,70 @@
-/*
- * race.c - Shows the race condition that can happen
- *          then threads try to modify multiple global
- *          values at the same time
- */
+s /*
+   * race.c - Shows the race condition that can happen
+   *          then threads try to modify multiple global
+   *          values at the same time
+   */
 
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <unistd.h>
-#include <pthread.h>
 
-// start flag
-volatile int start = 0;
+    // start flag
+    volatile int start = 0;
 
 // shared global
 static int counter1 = 0;
 static int counter2 = 0;
 
-void* thread_routine(void* args)
+void *thread_routine(void *args)
 {
-	int me = *((int *)args);
-	int you = me ? 0 : 1;
+    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);
+    // wait for start from master thread
+    while (!start)
+        ;
 
-	for (int j = 0; j < 100000000; j++)
-	{
-		// this is the critical section
-		counter1++;
-		counter2++;
-		// leaving critical section
-	}
+    for (int j = 0; j < 100000000; j++)
+    {
+        // this is the critical section
+        counter1++;
+        counter2++;
+        // leaving critical section
+    }
 
-	printf("Worker thread: %d done\n",me);
+    printf("Worker thread: %d done\n", me);
 
-	return NULL;
+    return NULL;
 }
 
 int main()
 {
-	int val1 = 0;
-	int val2 = 1;
-	
-	pthread_t thr1;
-	pthread_t thr2;
-	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) {
-		printf("COULD NOT CREATE A THREAD\n");
-		exit(EXIT_FAILURE);
-	}
+    int val1 = 0;
+    int val2 = 1;
 
-	start = 1;
+    pthread_t thr1;
+    pthread_t thr2;
+    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)
+    {
+        printf("COULD NOT CREATE A THREAD\n");
+        exit(EXIT_FAILURE);
+    }
 
-	pthread_join(thr1,NULL);
-	pthread_join(thr2,NULL);
+    start = 1;
 
-	printf("counter1: %d\n",counter1);
-	printf("counter2: %d\n",counter2);
-	return EXIT_SUCCESS;
+    pthread_join(thr1, NULL);
+    pthread_join(thr2, NULL);
+
+    printf("counter1: %d\n", counter1);
+    printf("counter2: %d\n", counter2);
+    return EXIT_SUCCESS;
 }
-