regress/lib/libpthread/cond5/cond5.c

   1 /*      $NetBSD: cond5.c,v 1.1 2003/01/30 18:57:07 thorpej Exp $        */
   2
   3 #include <assert.h>
   4 #include <err.h>
   5 #include <pthread.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8
   9 void *threadfunc(void *arg);
  10
  11 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
  12 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  13 int count, total, toggle;
  14 #define COUNT 50000
  15
  16 int main(void)
  17 {
  18         int ret;
  19         pthread_t new;
  20         void *joinval;
  21         int sharedval;
  22
  23         printf("1: condition variable test 5\n");
  24
  25         ret = pthread_mutex_lock(&mutex);
  26         if (ret)
  27                 err(1, "pthread_mutex_lock(1)");
  28
  29         count = COUNT;
  30         toggle = 0;
  31
  32         ret = pthread_create(&new, NULL, threadfunc, &sharedval);
  33         if (ret != 0)
  34                 err(1, "pthread_create");
  35
  36         printf("1: Before waiting.\n");
  37         while (count>0) {
  38                 count--;
  39                 total++;
  40                 toggle = 1;
  41                 pthread_cond_broadcast(&cond);
  42                 do {
  43                         pthread_cond_wait(&cond, &mutex);
  44                 } while (toggle != 0);
  45         }
  46         printf("1: After the loop.\n");
  47
  48         toggle = 1;
  49         pthread_mutex_unlock(&mutex);
  50         pthread_cond_signal(&cond);
  51
  52         printf("1: After releasing the mutex.\n");
  53         ret = pthread_join(new, &joinval);
  54         if (ret != 0)
  55                 err(1, "pthread_join");
  56
  57         printf("1: Thread joined. Final count = %d, total = %d\n",
  58             count, total);
  59         assert(count == 0);
  60         assert(total == COUNT);
  61
  62         return 0;
  63 }
  64
  65 void *
  66 threadfunc(void *arg)
  67 {
  68 #if 0
  69         int *share = (int *) arg;
  70 #endif
  71
  72         printf("2: Second thread.\n");
  73         pthread_mutex_lock(&mutex);
  74         while (count>0) {
  75                 count--;
  76                 total++;
  77                 toggle = 0;
  78                 pthread_cond_signal(&cond);
  79                 do {
  80                         pthread_cond_wait(&cond, &mutex);
  81                 } while (toggle != 1);
  82         }
  83         printf("2: After the loop.\n");
  84         pthread_mutex_unlock(&mutex);
  85
  86         return NULL;
  87 }