1  /* Plain recursive mutexes (native Windows implementation).
       2     Copyright (C) 2005-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2005.
      18     Based on GCC's gthr-win32.h.  */
      19  
      20  #ifndef _WINDOWS_RECMUTEX_H
      21  #define _WINDOWS_RECMUTEX_H
      22  
      23  #define WIN32_LEAN_AND_MEAN  /* avoid including junk */
      24  #include <windows.h>
      25  
      26  #include "windows-initguard.h"
      27  
      28  /* The native Windows documentation says that CRITICAL_SECTION already
      29     implements a recursive lock.  But we need not rely on it: It's easy to
      30     implement a recursive lock without this assumption.  */
      31  
      32  typedef struct
      33          {
      34            glwthread_initguard_t guard; /* protects the initialization */
      35            DWORD owner;
      36            unsigned long depth;
      37            CRITICAL_SECTION lock;
      38          }
      39          glwthread_recmutex_t;
      40  
      41  #define GLWTHREAD_RECMUTEX_INIT { GLWTHREAD_INITGUARD_INIT, 0, 0 }
      42  
      43  #ifdef __cplusplus
      44  extern "C" {
      45  #endif
      46  
      47  extern void glwthread_recmutex_init (glwthread_recmutex_t *mutex);
      48  extern int glwthread_recmutex_lock (glwthread_recmutex_t *mutex);
      49  extern int glwthread_recmutex_trylock (glwthread_recmutex_t *mutex);
      50  extern int glwthread_recmutex_unlock (glwthread_recmutex_t *mutex);
      51  extern int glwthread_recmutex_destroy (glwthread_recmutex_t *mutex);
      52  
      53  #ifdef __cplusplus
      54  }
      55  #endif
      56  
      57  #endif /* _WINDOWS_RECMUTEX_H */