glibc/sysdeps/pthread/tst-cond25.c

/* Verify that condition variables synchronized by PI mutexes don't hang on
   on cancellation.
   Copyright (C) 2012-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>

#define NUM 5
#define ITERS 10000
#define COUNT 100

typedef void *(*thr_func) (void *);

pthread_mutex_t mutex;
pthread_cond_t cond;

void cleanup (void *u)
{
  /* pthread_cond_wait should always return with the mutex locked.  The
     pthread_mutex_unlock implementation does not actually check whether we
     own the mutex for several mutex kinds, so check this explicitly.  */
  int ret = pthread_mutex_trylock (&mutex);
  if (ret != EDEADLK && ret != EBUSY)
    {
      printf ("mutex not locked in cleanup %d\n", ret);
      abort ();
    }
  if (pthread_mutex_unlock (&mutex))
    abort ();
}

void *
signaller (void *u)
{
  int i, ret = 0;
  void *tret = NULL;

  for (i = 0; i < ITERS; i++)
    {
      if ((ret = pthread_mutex_lock (&mutex)) != 0)
        {
	  tret = (void *)1;
	  printf ("signaller:mutex_lock failed: %s\n", strerror (ret));
	  goto out;
	}
      if ((ret = pthread_cond_signal (&cond)) != 0)
        {
	  tret = (void *)1;
	  printf ("signaller:signal failed: %s\n", strerror (ret));
	  goto unlock_out;
	}
      if ((ret = pthread_mutex_unlock (&mutex)) != 0)
        {
	  tret = (void *)1;
	  printf ("signaller:mutex_unlock failed: %s\n", strerror (ret));
	  goto out;
	}
      pthread_testcancel ();
    }

out:
  return tret;

unlock_out:
  if ((ret = pthread_mutex_unlock (&mutex)) != 0)
    printf ("signaller:mutex_unlock[2] failed: %s\n", strerror (ret));
  goto out;
}

void *
waiter (void *u)
{
  int i, ret = 0;
  void *tret = NULL;
  int seq = (uintptr_t) u;

  for (i = 0; i < ITERS / NUM; i++)
    {
      if ((ret = pthread_mutex_lock (&mutex)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("waiter[%u]:mutex_lock failed: %s\n", seq, strerror (ret));
	  goto out;
	}
      pthread_cleanup_push (cleanup, NULL);

      if ((ret = pthread_cond_wait (&cond, &mutex)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("waiter[%u]:wait failed: %s\n", seq, strerror (ret));
	  goto unlock_out;
	}

      if ((ret = pthread_mutex_unlock (&mutex)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("waiter[%u]:mutex_unlock failed: %s\n", seq, strerror (ret));
	  goto out;
	}
      pthread_cleanup_pop (0);
    }

out:
  puts ("waiter tests done");
  return tret;

unlock_out:
  if ((ret = pthread_mutex_unlock (&mutex)) != 0)
    printf ("waiter:mutex_unlock[2] failed: %s\n", strerror (ret));
  goto out;
}

void *
timed_waiter (void *u)
{
  int i, ret;
  void *tret = NULL;
  int seq = (uintptr_t) u;

  for (i = 0; i < ITERS / NUM; i++)
    {
      struct timespec ts;

      if ((ret = clock_gettime(CLOCK_REALTIME, &ts)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("%u:clock_gettime failed: %s\n", seq, strerror (errno));
	  goto out;
	}
      ts.tv_sec += 20;

      if ((ret = pthread_mutex_lock (&mutex)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("waiter[%u]:mutex_lock failed: %s\n", seq, strerror (ret));
	  goto out;
	}
      pthread_cleanup_push (cleanup, NULL);

      /* We should not time out either.  */
      if ((ret = pthread_cond_timedwait (&cond, &mutex, &ts)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("waiter[%u]:timedwait failed: %s\n", seq, strerror (ret));
	  goto unlock_out;
	}
      if ((ret = pthread_mutex_unlock (&mutex)) != 0)
        {
	  tret = (void *) (uintptr_t) 1;
	  printf ("waiter[%u]:mutex_unlock failed: %s\n", seq, strerror (ret));
	  goto out;
	}
      pthread_cleanup_pop (0);
    }

out:
  puts ("timed_waiter tests done");
  return tret;

unlock_out:
  if ((ret = pthread_mutex_unlock (&mutex)) != 0)
    printf ("waiter[%u]:mutex_unlock[2] failed: %s\n", seq, strerror (ret));
  goto out;
}

int
do_test_wait (thr_func f)
{
  pthread_t w[NUM];
  pthread_t s;
  pthread_mutexattr_t attr;
  int i, j, ret = 0;
  void *thr_ret;

  for (i = 0; i < COUNT; i++)
    {
      if ((ret = pthread_mutexattr_init (&attr)) != 0)
        {
	  printf ("mutexattr_init failed: %s\n", strerror (ret));
	  goto out;
	}

      if ((ret = pthread_mutexattr_setprotocol (&attr,
                                                PTHREAD_PRIO_INHERIT)) != 0)
        {
	  printf ("mutexattr_setprotocol failed: %s\n", strerror (ret));
	  goto out;
	}

      if ((ret = pthread_cond_init (&cond, NULL)) != 0)
        {
	  printf ("cond_init failed: %s\n", strerror (ret));
	  goto out;
	}

      if ((ret = pthread_mutex_init (&mutex, &attr)) != 0)
        {
	  printf ("mutex_init failed: %s\n", strerror (ret));
	  goto out;
	}

      for (j = 0; j < NUM; j++)
        if ((ret = pthread_create (&w[j], NULL,
                                   f, (void *) (uintptr_t) j)) != 0)
	  {
	    printf ("waiter[%d]: create failed: %s\n", j, strerror (ret));
	    goto out;
	  }

      if ((ret = pthread_create (&s, NULL, signaller, NULL)) != 0)
        {
	  printf ("signaller: create failed: %s\n", strerror (ret));
	  goto out;
	}

      for (j = 0; j < NUM; j++)
        {
          pthread_cancel (w[j]);

          if ((ret = pthread_join (w[j], &thr_ret)) != 0)
	    {
	      printf ("waiter[%d]: join failed: %s\n", j, strerror (ret));
	      goto out;
	    }

          if (thr_ret != NULL && thr_ret != PTHREAD_CANCELED)
	    {
	      ret = 1;
	      goto out;
	    }
        }

      /* The signalling thread could have ended before it was cancelled.  */
      pthread_cancel (s);

      if ((ret = pthread_join (s, &thr_ret)) != 0)
        {
	  printf ("signaller: join failed: %s\n", strerror (ret));
	  goto out;
	}

      if (thr_ret != NULL && thr_ret != PTHREAD_CANCELED)
        {
          ret = 1;
          goto out;
        }
    }

out:
  return ret;
}

int
do_test (int argc, char **argv)
{
  int ret = do_test_wait (waiter);

  if (ret)
    return ret;

  return do_test_wait (timed_waiter);
}

#include "../test-skeleton.c"