regress/lib/libpthread/mutex4/mutex4.c

   1 /*      $NetBSD$        */
   2
   3 #include <assert.h>
   4 #include <err.h>
   5 #include <pthread.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 void *threadfunc(void *arg);
  11
  12 pthread_mutex_t mutex;
  13
  14 int
  15 main(int argc, char *argv[])
  16 {
  17         int x,ret;
  18         pthread_t new;
  19         pthread_mutexattr_t mattr;
  20         void *joinval;
  21
  22         printf("1: Mutex-test 4\n");
  23
  24         pthread_mutexattr_init(&mattr);
  25         pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_RECURSIVE);
  26
  27         pthread_mutex_init(&mutex, &mattr);
  28
  29         pthread_mutexattr_destroy(&mattr);
  30
  31         x = 1;
  32         pthread_mutex_lock(&mutex);
  33         ret = pthread_create(&new, NULL, threadfunc, &x);
  34         if (ret != 0)
  35                 err(1, "pthread_create");
  36
  37         printf("1: Before recursively acquiring the mutex.\n");
  38         ret = pthread_mutex_lock(&mutex);
  39         if (ret != 0)
  40                 err(1, "pthread_mutex_lock recursive");
  41
  42         printf("1: Before releasing the mutex once.\n");
  43         sleep(2);
  44         pthread_mutex_unlock(&mutex);
  45         printf("1: After releasing the mutex once.\n");
  46
  47         x = 20;
  48
  49         printf("1: Before releasing the mutex twice.\n");
  50         sleep(2);
  51         pthread_mutex_unlock(&mutex);
  52         printf("1: After releasing the mutex twice.\n");
  53
  54         ret = pthread_join(new, &joinval);
  55         if (ret != 0)
  56                 err(1, "pthread_join");
  57
  58         pthread_mutex_lock(&mutex);
  59         printf("1: Thread joined. X was %d. Return value (int) was %d\n",
  60             x, *(int *)joinval);
  61         assert(x == 21);
  62         assert(*(int *)joinval == 21);
  63         pthread_mutex_unlock(&mutex);
  64         return 0;
  65 }
  66
  67 void *
  68 threadfunc(void *arg)
  69 {
  70         int *param;
  71
  72         printf("2: Second thread.\n");
  73
  74         param = arg;
  75         printf("2: Locking mutex\n");
  76         pthread_mutex_lock(&mutex);
  77         printf("2: Got mutex. *param = %d\n", *param);
  78         (*param)++;
  79
  80         pthread_mutex_unlock(&mutex);
  81
  82         return param;
  83 }