2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #if !defined(LOCK_H_INCLUDED)
22 #define LOCK_H_INCLUDED
25 #if !defined(_MSC_VER)
29 typedef pthread_mutex_t Lock;
30 typedef pthread_cond_t WaitCondition;
32 # define lock_init(x) pthread_mutex_init(x, NULL)
33 # define lock_grab(x) pthread_mutex_lock(x)
34 # define lock_release(x) pthread_mutex_unlock(x)
35 # define lock_destroy(x) pthread_mutex_destroy(x)
36 # define cond_destroy(x) pthread_cond_destroy(x)
37 # define cond_init(x) pthread_cond_init(x, NULL)
38 # define cond_signal(x) pthread_cond_signal(x)
39 # define cond_wait(x,y) pthread_cond_wait(x,y)
43 #define WIN32_LEAN_AND_MEAN
45 #undef WIN32_LEAN_AND_MEAN
47 // Default fast and race free locks and condition variables
48 #if !defined(OLD_LOCKS)
51 typedef CONDITION_VARIABLE WaitCondition;
53 # define lock_init(x) InitializeSRWLock(x)
54 # define lock_grab(x) AcquireSRWLockExclusive(x)
55 # define lock_release(x) ReleaseSRWLockExclusive(x)
56 # define lock_destroy(x) (x)
57 # define cond_destroy(x) (x)
58 # define cond_init(x) InitializeConditionVariable(x)
59 # define cond_signal(x) WakeConditionVariable(x)
60 # define cond_wait(x,y) SleepConditionVariableSRW(x, y, INFINITE,0)
62 // Fallback solution to build for Windows XP and older versions, note that
63 // cond_wait() is racy between lock_release() and WaitForSingleObject().
66 typedef CRITICAL_SECTION Lock;
67 typedef HANDLE WaitCondition;
69 # define lock_init(x) InitializeCriticalSection(x)
70 # define lock_grab(x) EnterCriticalSection(x)
71 # define lock_release(x) LeaveCriticalSection(x)
72 # define lock_destroy(x) DeleteCriticalSection(x)
73 # define cond_init(x) { *x = CreateEvent(0, FALSE, FALSE, 0); }
74 # define cond_destroy(x) CloseHandle(*x)
75 # define cond_signal(x) SetEvent(*x)
76 # define cond_wait(x,y) { lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); }
81 #endif // !defined(LOCK_H_INCLUDED)