/* * pthread_mutex_init.c * * Description: * This translation unit implements mutual exclusion (mutex) primitives. * * -------------------------------------------------------------------------- * *      Pthreads-win32 - POSIX Threads Library for Win32 *      Copyright(C) 1998 John E. Bossom *      Copyright(C) 1999,2005 Pthreads-win32 contributors *  *      Contact Email: rpj@callisto.canberra.edu.au *  *      The current list of contributors is contained *      in the file CONTRIBUTORS included with the source *      code distribution. The list can also be seen at the *      following World Wide Web location: *      http://sources.redhat.com/pthreads-win32/contributors.html *  *      This 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 of the License, or (at your option) any later version. *  *      This 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 this library in the file COPYING.LIB; *      if not, write to the Free Software Foundation, Inc., *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */#include "pthread.h"#include "implement.h"intpthread_mutex_init (pthread_mutex_t * mutex, const pthread_mutexattr_t * attr){  int result = 0;  pthread_mutex_t mx;  if (mutex == NULL)    {      return EINVAL;    }  if (attr != NULL      && *attr != NULL && (*attr)->pshared == PTHREAD_PROCESS_SHARED)    {      /*       * Creating mutex that can be shared between       * processes.       */#if _POSIX_THREAD_PROCESS_SHARED >= 0      /*       * Not implemented yet.       */#error ERROR [__FILE__, line __LINE__]: Process shared mutexes are not supported yet.#else      return ENOSYS;#endif /* _POSIX_THREAD_PROCESS_SHARED */    }  mx = (pthread_mutex_t) calloc (1, sizeof (*mx));  if (mx == NULL)    {      result = ENOMEM;    }  else    {      mx->lock_idx = 0;      mx->recursive_count = 0;      mx->kind = (attr == NULL || *attr == NULL		  ? PTHREAD_MUTEX_DEFAULT : (*attr)->kind);      mx->ownerThread.p = NULL;      mx->event = CreateEvent (NULL, PTW32_FALSE,    /* manual reset = No */                              PTW32_FALSE,           /* initial state = not signaled */                              NULL);                 /* event name */      if (0 == mx->event)        {          result = ENOSPC;          free (mx);          mx = NULL;        }    }  *mutex = mx;  return (result);}