1  /* Test sem_timedwait cancellation for contended 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    int e;
      50  
      51    pthread_cleanup_push (cleanup, NULL);
      52  
      53    e = pthread_barrier_wait (&bar);
      54    if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
      55      {
      56        puts ("error: tf: 1st barrier_wait failed");
      57        exit (1);
      58      }
      59  
      60    struct timeval tv;
      61    (void) gettimeofday (&tv, NULL);
      62  
      63    struct timespec ts;
      64    TIMEVAL_TO_TIMESPEC (&tv, &ts);
      65  
      66    /* Timeout in 5 seconds.  */
      67    ts.tv_sec += 5;
      68  
      69    /* This call should block and be cancelable.  */
      70    errno = 0;
      71    e = sem_timedwait (&sem, &ts);
      72  
      73    pthread_cleanup_pop (0);
      74  
      75    return NULL;
      76  }
      77  
      78  
      79  static int
      80  do_test (void)
      81  {
      82    pthread_t th;
      83  
      84    if (pthread_barrier_init (&bar, NULL, 2) != 0)
      85      {
      86        puts ("error: barrier_init failed");
      87        exit (1);
      88      }
      89  
      90    if (sem_init (&sem, 0, 0) != 0)
      91      {
      92        puts ("error: sem_init failed");
      93        exit (1);
      94      }
      95  
      96    if (pthread_create (&th, NULL, tf, NULL) != 0)
      97      {
      98        puts ("error: create failed");
      99        exit (1);
     100      }
     101  
     102    int e = pthread_barrier_wait (&bar);
     103    if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
     104      {
     105        puts ("error: 1st barrier_wait failed");
     106        exit (1);
     107      }
     108  
     109    /* Give the child a chance to go to sleep in sem_wait.  */
     110    sleep (1);
     111  
     112    /* Check whether cancellation is honored when waiting in sem_timedwait.  */
     113    if (pthread_cancel (th) != 0)
     114      {
     115        puts ("error: 1st cancel failed");
     116        exit (1);
     117      }
     118  
     119    void *r;
     120    if (pthread_join (th, &r) != 0)
     121      {
     122        puts ("error: join failed");
     123        exit (1);
     124      }
     125  
     126    if (r != PTHREAD_CANCELED)
     127      {
     128        puts ("error: thread not canceled");
     129        exit (1);
     130      }
     131  
     132    return 0;
     133  }
     134  
     135  
     136  #define TEST_FUNCTION do_test ()
     137  #include "../test-skeleton.c"