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      1 /* Plain recursive mutexes (native Windows implementation).
      2    Copyright (C) 2005-2022 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 (at) 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 */
     58