mingw-w64-libraries/winpthreads/tests/pthread_mutex/robust-normal-basic.c

/*
   Copyright (c) 2026 mingw-w64 project

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   The above copyright notice and this permission notice shall be included in
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   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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*/

#include "test.h"

/**
 * Test Summary:
 *
 * Create robust normal mutex and test basic assumptions about mutex
 * ownership and lifetime.
 */

int main (void)
{
  pthread_mutexattr_t mutexAttr;
  pthread_mutex_t mutex;

  assert (pthread_mutexattr_init (&mutexAttr) == 0);
  assert (pthread_mutexattr_settype (&mutexAttr, PTHREAD_MUTEX_NORMAL) == 0);
  assert (pthread_mutexattr_setrobust (&mutexAttr, PTHREAD_MUTEX_ROBUST) == 0);
  assert (pthread_mutex_init (&mutex, &mutexAttr) == 0);
  assert (mutex != (pthread_mutex_t) 0);
  assert (pthread_mutex_lock (&mutex) == 0);
  /**
   * According to POSIX, an attempt to recursively lock normal robust mutex
   * results in a deadlock.
   *
   * Since winpthreads implements robust mutexes using Windows mutexes, which
   * support recursive locking, robust mutexes cannot deadlock in this case.
   *
   * POSIX allows `pthread_mutex_lock` to fail with `EDEADLK` when a deadlock
   * condition has been detected; this is what we do.
   */
  assert (pthread_mutex_lock (&mutex) == EDEADLK);
  assert (pthread_mutex_trylock (&mutex) == EBUSY);
  assert (pthread_mutex_destroy (&mutex) == EBUSY);
  assert (pthread_mutex_consistent (&mutex) == EINVAL);
  assert (pthread_mutex_unlock (&mutex) == 0);
  assert (pthread_mutex_unlock (&mutex) == EPERM);
  assert (pthread_mutex_destroy (&mutex) == 0);
  assert (mutex == (pthread_mutex_t) 0);
  assert (pthread_mutex_lock (&mutex) == EINVAL);
  assert (pthread_mutexattr_destroy (&mutexAttr) == 0);

  return 0;
}