mirror of
https://github.com/opelly27/Stockfish.git
synced 2026-05-20 13:17:44 +00:00
Marco Costalba
22e40c8c10
In Windows when OLD_LOCKS is defined we use SetEvent() to mimic the semantic of the POSIX pthread_cond_signal(). Unfortunatly there is not a direct mapping because with SetEvent() the state of an event object remains signaled until it is set explicitly to the nonsignaled state or until a single waiting thread has been released. Instead in case of pthread_cond_signal(), if there are no waiting threads it has no effect. What we may want is something like PulseEvent() instead of SetEvent(). Unfortunatly it is documented by Mcrosoft as 'unreliable' due to spurious wakes up that could filter out the signal resetting. So we opt to reset manually any pending signaled state before to go to sleep. This fixes the strange misbehaves during 'stockfish bench' when using OLD_LOCKS under Windows. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(LOCK_H_INCLUDED)
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#define LOCK_H_INCLUDED
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#if !defined(_MSC_VER)
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# include <pthread.h>
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typedef pthread_mutex_t Lock;
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typedef pthread_cond_t WaitCondition;
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# define lock_init(x) pthread_mutex_init(x, NULL)
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# define lock_grab(x) pthread_mutex_lock(x)
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# define lock_release(x) pthread_mutex_unlock(x)
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# define lock_destroy(x) pthread_mutex_destroy(x)
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# define cond_destroy(x) pthread_cond_destroy(x)
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# define cond_init(x) pthread_cond_init(x, NULL)
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# define cond_signal(x) pthread_cond_signal(x)
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# define cond_wait(x,y) pthread_cond_wait(x,y)
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# define cond_timedwait(x,y,z) pthread_cond_timedwait(x,y,z)
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#else
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#define NOMINMAX // disable macros min() and max()
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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#undef NOMINMAX
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// Default fast and race free locks and condition variables
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#if !defined(OLD_LOCKS)
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typedef SRWLOCK Lock;
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typedef CONDITION_VARIABLE WaitCondition;
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# define lock_init(x) InitializeSRWLock(x)
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# define lock_grab(x) AcquireSRWLockExclusive(x)
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# define lock_release(x) ReleaseSRWLockExclusive(x)
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# define lock_destroy(x) (x)
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# define cond_destroy(x) (x)
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# define cond_init(x) InitializeConditionVariable(x)
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# define cond_signal(x) WakeConditionVariable(x)
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# define cond_wait(x,y) SleepConditionVariableSRW(x,y,INFINITE,0)
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# define cond_timedwait(x,y,z) SleepConditionVariableSRW(x,y,z,0)
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// Fallback solution to build for Windows XP and older versions, note that
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// cond_wait() is racy between lock_release() and WaitForSingleObject().
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#else
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typedef CRITICAL_SECTION Lock;
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typedef HANDLE WaitCondition;
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# define lock_init(x) InitializeCriticalSection(x)
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# define lock_grab(x) EnterCriticalSection(x)
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# define lock_release(x) LeaveCriticalSection(x)
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# define lock_destroy(x) DeleteCriticalSection(x)
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# define cond_init(x) { *x = CreateEvent(0, FALSE, FALSE, 0); }
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# define cond_destroy(x) CloseHandle(*x)
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# define cond_signal(x) SetEvent(*x)
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# define cond_wait(x,y) { ResetEvent(*x); lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); }
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# define cond_timedwait(x,y,z) { ResetEvent(*x); lock_release(y); WaitForSingleObject(*x,z); lock_grab(y); }
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#endif
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#endif
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#endif // !defined(LOCK_H_INCLUDED)
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