sysdeps/pthread/tst-cancel15.c

   1 /* Test sem_timedwait cancellation for contended case.
   2    Copyright (C) 2003-2024 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"