/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
#if !defined(LOCK_H_INCLUDED)
#define LOCK_H_INCLUDED
-
-// x86 assembly language locks or OS spin locks may perform faster than
-// mutex locks on some platforms. On my machine, mutexes seem to be the
-// best.
-
-//#define ASM_LOCK
-//#define OS_SPIN_LOCK
-
-
-#if defined(ASM_LOCK)
-
-
-typedef volatile int Lock;
-
-static inline void LockX86(Lock *lock) {
- int dummy;
- asm __volatile__("1: movl $1, %0" "\n\t"
- " xchgl (%1), %0" "\n\t" " testl %0, %0" "\n\t"
- " jz 3f" "\n\t" "2: pause" "\n\t"
- " movl (%1), %0" "\n\t" " testl %0, %0" "\n\t"
- " jnz 2b" "\n\t" " jmp 1b" "\n\t" "3:"
- "\n\t":"=&q"(dummy)
- :"q"(lock)
- :"cc");
-}
-
-static inline void UnlockX86(Lock *lock) {
- int dummy;
- asm __volatile__("movl $0, (%1)":"=&q"(dummy)
- :"q"(lock));
-}
-
-# define lock_init(x, y) (*(x) = 0)
-# define lock_grab(x) LockX86(x)
-# define lock_release(x) UnlockX86(x)
-# define lock_destroy(x)
-
-
-#elif defined(OS_SPIN_LOCK)
-
-
-# include <libkern/OSAtomic.h>
-
-typedef OSSpinLock Lock;
-
-# define lock_init(x, y) (*(x) = 0)
-# define lock_grab(x) OSSpinLockLock(x)
-# define lock_release(x) OSSpinLockUnlock(x)
-# define lock_destroy(x)
-
-
-#elif !defined(_MSC_VER)
+#if !defined(_MSC_VER)
# include <pthread.h>
typedef pthread_mutex_t Lock;
+typedef pthread_cond_t WaitCondition;
-# define lock_init(x, y) pthread_mutex_init(x, y)
+# define lock_init(x) pthread_mutex_init(x, NULL)
# define lock_grab(x) pthread_mutex_lock(x)
# define lock_release(x) pthread_mutex_unlock(x)
# define lock_destroy(x) pthread_mutex_destroy(x)
-
+# define cond_destroy(x) pthread_cond_destroy(x)
+# define cond_init(x) pthread_cond_init(x, NULL)
+# define cond_signal(x) pthread_cond_signal(x)
+# define cond_wait(x,y) pthread_cond_wait(x,y)
+# define cond_timedwait(x,y,z) pthread_cond_timedwait(x,y,z)
#else
+#define NOMINMAX // disable macros min() and max()
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
+#undef NOMINMAX
+// We use critical sections on Windows to support Windows XP and older versions,
+// unfortunatly cond_wait() is racy between lock_release() and WaitForSingleObject()
+// but apart from this they have the same speed performance of SRW locks.
typedef CRITICAL_SECTION Lock;
-# define lock_init(x, y) InitializeCriticalSection(x)
+typedef HANDLE WaitCondition;
+
+# define lock_init(x) InitializeCriticalSection(x)
# define lock_grab(x) EnterCriticalSection(x)
# define lock_release(x) LeaveCriticalSection(x)
# define lock_destroy(x) DeleteCriticalSection(x)
-
+# define cond_init(x) { *x = CreateEvent(0, FALSE, FALSE, 0); }
+# define cond_destroy(x) CloseHandle(*x)
+# define cond_signal(x) SetEvent(*x)
+# define cond_wait(x,y) { lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); }
+# define cond_timedwait(x,y,z) { lock_release(y); WaitForSingleObject(*x,z); lock_grab(y); }
#endif