1 /* Spin locks (native Windows implementation). 2 Copyright (C) 2019-2021 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>, 2019. */ 18 19 #ifndef _WINDOWS_SPIN_H 20 #define _WINDOWS_SPIN_H 21 22 #define WIN32_LEAN_AND_MEAN /* avoid including junk */ 23 #include <windows.h> 24 25 typedef struct 26 { 27 LONG volatile word; 28 } 29 glwthread_spinlock_t; 30 31 #define GLWTHREAD_SPIN_INIT { 0 } 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 extern void glwthread_spin_init (glwthread_spinlock_t *lock); 38 extern int glwthread_spin_lock (glwthread_spinlock_t *lock); 39 extern int glwthread_spin_trylock (glwthread_spinlock_t *lock); 40 extern int glwthread_spin_unlock (glwthread_spinlock_t *lock); 41 extern int glwthread_spin_destroy (glwthread_spinlock_t *lock); 42 43 #ifdef __cplusplus 44 } 45 #endif 46 47 #endif /* _WINDOWS_SPIN_H */