regress/lib/libpthread/once3/once3.c

   1 /*      $NetBSD: once3.c,v 1.1 2005/07/16 23:02:11 nathanw Exp $        */
   2
   3 #include <pthread.h>
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <sys/time.h>
   9
  10 pthread_once_t once = PTHREAD_ONCE_INIT;
  11 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
  12
  13 void ofunc(void);
  14 void* threadfunc(void *);
  15 void cleanup(void *);
  16 void handler(int, siginfo_t *, void *);
  17
  18 int
  19 main(int argc, char *argv[])
  20 {
  21         pthread_t thread;
  22         struct sigaction act;
  23         struct itimerval it;
  24         printf("Test 3 of pthread_once() (test versus cancellation)\n");
  25
  26         act.sa_sigaction = handler;
  27         sigemptyset(&act.sa_mask);
  28         act.sa_flags = SA_SIGINFO;
  29         sigaction(SIGALRM, &act, NULL);
  30
  31         timerclear(&it.it_value);
  32         it.it_value.tv_usec = 500000;
  33         timerclear(&it.it_interval);
  34         setitimer(ITIMER_REAL, &it, NULL);
  35
  36         pthread_mutex_lock(&mutex);
  37         pthread_create(&thread, NULL, threadfunc, NULL);
  38         pthread_cancel(thread);
  39         pthread_mutex_unlock(&mutex);
  40         pthread_join(thread, NULL);
  41
  42         pthread_once(&once, ofunc);
  43
  44         /* Cancel timer */
  45         timerclear(&it.it_value);
  46         setitimer(ITIMER_REAL, &it, NULL);
  47
  48         printf("Test succeeded\n");
  49
  50         return 0;
  51 }
  52
  53 void
  54 cleanup(void *m)
  55 {
  56         pthread_mutex_t *mu = m;
  57
  58         pthread_mutex_unlock(mu);
  59 }
  60
  61 void
  62 ofunc(void)
  63 {
  64
  65         pthread_testcancel();
  66 }
  67
  68 void *
  69 threadfunc(void *arg)
  70 {
  71
  72         pthread_mutex_lock(&mutex);
  73         pthread_cleanup_push(cleanup, &mutex);
  74         pthread_once(&once, ofunc);
  75         pthread_cleanup_pop(1);
  76         return NULL;
  77 }
  78
  79
  80 void
  81 handler(int sig, siginfo_t *info, void *ctx)
  82 {
  83         printf("Signal handler was called; main thread deadlocked in "
  84             "pthread_once().\n"
  85             "Test failed.\n");
  86         exit(1);
  87 }