/* Plain recursive mutexes (native Windows implementation).

   Copyright (C) 2005-2020 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2005.

   Based on GCC's gthr-win32.h.  */

#ifndef _WINDOWS_RECMUTEX_H

#define _WINDOWS_RECMUTEX_H

#define WIN32_LEAN_AND_MEAN  /* avoid including junk */

#include <windows.h>

#include "windows-initguard.h"

/* The native Windows documentation says that CRITICAL_SECTION already

   implements a recursive lock.  But we need not rely on it: It's easy to

   implement a recursive lock without this assumption.  */

typedef struct

        {

          glwthread_initguard_t guard; /* protects the initialization */

          DWORD owner;

          unsigned long depth;

          CRITICAL_SECTION lock;

        }

        glwthread_recmutex_t;

#define GLWTHREAD_RECMUTEX_INIT { GLWTHREAD_INITGUARD_INIT, 0, 0 }

#ifdef __cplusplus

extern "C" {

#endif

extern void glwthread_recmutex_init (glwthread_recmutex_t *mutex);

extern int glwthread_recmutex_lock (glwthread_recmutex_t *mutex);

extern int glwthread_recmutex_trylock (glwthread_recmutex_t *mutex);

extern int glwthread_recmutex_unlock (glwthread_recmutex_t *mutex);

extern int glwthread_recmutex_destroy (glwthread_recmutex_t *mutex);

#ifdef __cplusplus

}

#endif

#endif /* _WINDOWS_RECMUTEX_H */