1 /* Plain recursive mutexes (native Windows implementation). 2 Copyright (C) 2005-2020 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3, or (at your option) 7 any later version. 8 9 This program 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 General Public License for more details. 13 14 You should have received a copy of the GNU 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 */ 58