helgrind/tests/hg01_all_ok.c

   1 /* All OK */
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <pthread.h>
   5
   6 static pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
   7
   8 static int shared = 0;
   9 static char *ptr;
  10
  11 static void breakme(void)
  12 {
  13    if (shared == 1)
  14       memset (ptr, 0x55, 1000);
  15 }
  16
  17 static void *th(void *v)
  18 {
  19         pthread_mutex_lock(&mx);
  20         shared++;
  21         if (shared == 1) {
  22            ptr = malloc (1008);
  23            breakme();
  24         }
  25         if (shared == 2) {
  26            free (ptr);
  27            breakme();
  28         }
  29         pthread_mutex_unlock(&mx);
  30
  31         return 0;
  32 }
  33
  34 int main()
  35 {
  36         pthread_t a, b;
  37
  38         pthread_mutex_lock(&mx);
  39         pthread_mutex_unlock(&mx);
  40
  41         pthread_create(&a, NULL, th, NULL);
  42         pthread_create(&b, NULL, th, NULL);
  43
  44         pthread_join(a, NULL);
  45         pthread_join(b, NULL);
  46
  47         return 0;
  48 }