mingw-w64-libraries/winpthreads/tests/pthread_mutex/robust-errorcheck-trylock-recursive.c

/*
   Copyright (c) 2026 mingw-w64 project

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*/

#include "test.h"

/**
 * Test Summary:
 *
 * Main thread M creates robust error checking mutex L.
 *
 * Thread A locks L.
 *
 * Thread A attempts to lock L again; the call to `pthread_mutex_trylock` must
 * fail with EBUSY.
 *
 * Thread A unlocks L.
 *
 * Thread A attempts to unlock L again; the call to `pthread_mutex_unlock` must
 * fail with EPERM.
 *
 * Thread M destroys L.
 */

static void *ThreadA (void *arg)
{
  pthread_mutex_t *mutex = arg;

  assert (pthread_mutex_trylock (mutex) == 0);
  assert (pthread_mutex_trylock (mutex) == EBUSY);
  assert (pthread_mutex_unlock (mutex) == 0);
  assert (pthread_mutex_unlock (mutex) == EPERM);

  return arg;
}

int main (void)
{
  pthread_mutexattr_t mutexAttr;
  pthread_mutex_t mutex;
  pthread_t thread;
  void *result;

  assert (pthread_mutexattr_init (&mutexAttr) == 0);
  assert (pthread_mutexattr_settype (&mutexAttr, PTHREAD_MUTEX_ERRORCHECK) == 0);
  assert (pthread_mutexattr_setrobust (&mutexAttr, PTHREAD_MUTEX_ROBUST) == 0);
  assert (pthread_mutex_init (&mutex, &mutexAttr) == 0);
  assert (pthread_create (&thread, NULL, ThreadA, &mutex) == 0);
  assert (pthread_join (thread, &result) == 0);
  assert (result == &mutex);
  assert (pthread_mutex_destroy (&mutex) == 0);
  assert (pthread_mutexattr_destroy (&mutexAttr) == 0);

  return 0;
}