1  /* Test sem_timedwait cancellation for uncontended case.
       2     Copyright (C) 2003-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <pthread.h>
      21  #include <semaphore.h>
      22  #include <stdio.h>
      23  #include <stdlib.h>
      24  #include <string.h>
      25  #include <unistd.h>
      26  #include <sys/time.h>
      27  
      28  
      29  static pthread_barrier_t bar;
      30  static sem_t sem;
      31  
      32  
      33  static void
      34  cleanup (void *arg)
      35  {
      36    static int ncall;
      37  
      38    if (++ncall != 1)
      39      {
      40        puts ("second call to cleanup");
      41        exit (1);
      42      }
      43  }
      44  
      45  
      46  static void *
      47  tf (void *arg)
      48  {
      49    pthread_cleanup_push (cleanup, NULL);
      50  
      51    int e = pthread_barrier_wait (&bar);
      52    if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
      53      {
      54        puts ("error: tf: 1st barrier_wait failed");
      55        exit (1);
      56      }
      57  
      58    struct timeval tv;
      59    (void) gettimeofday (&tv, NULL);
      60  
      61    struct timespec ts;
      62    TIMEVAL_TO_TIMESPEC (&tv, &ts);
      63  
      64    /* Timeout in 5 seconds.  */
      65    ts.tv_sec += 5;
      66  
      67    /* This call should block and be cancelable.  */
      68    sem_timedwait (&sem, &ts);
      69  
      70    pthread_cleanup_pop (0);
      71  
      72    return NULL;
      73  }
      74  
      75  
      76  static int
      77  do_test (void)
      78  {
      79    pthread_t th;
      80  
      81    if (pthread_barrier_init (&bar, NULL, 2) != 0)
      82      {
      83        puts ("error: barrier_init failed");
      84        exit (1);
      85      }
      86  
      87    if (sem_init (&sem, 0, 1) != 0)
      88      {
      89        puts ("error: sem_init failed");
      90        exit (1);
      91      }
      92  
      93    if (pthread_create (&th, NULL, tf, NULL) != 0)
      94      {
      95        puts ("error: create failed");
      96        exit (1);
      97      }
      98  
      99    /* Check whether cancellation is honored even before sem_timedwait does
     100       anything.  */
     101    if (pthread_cancel (th) != 0)
     102      {
     103        puts ("error: 1st cancel failed");
     104        exit (1);
     105      }
     106  
     107    int e = pthread_barrier_wait (&bar);
     108    if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
     109      {
     110        puts ("1st barrier_wait failed");
     111        exit (1);
     112      }
     113  
     114    void *r;
     115    if (pthread_join (th, &r) != 0)
     116      {
     117        puts ("join failed");
     118        exit (1);
     119      }
     120  
     121    if (r != PTHREAD_CANCELED)
     122      {
     123        puts ("thread not canceled");
     124        exit (1);
     125      }
     126  
     127    return 0;
     128  }
     129  
     130  
     131  #define TEST_FUNCTION do_test ()
     132  #include "../test-skeleton.c"