X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Flock.h;h=85d32a5cbb0432753b500dd33e2f989f63ec8a35;hp=13c54f1fbde88bd0152493f16d9e0674691d543d;hb=06f33ff1ee0c0e8345cb6d5b84ce5db9f043203d;hpb=936cd5b83d6b5925f80294e8887148c21a03a11d

diff --git a/src/lock.h b/src/lock.h
index 13c54f1f..85d32a5c 100644
--- a/src/lock.h
+++ b/src/lock.h
@@ -1,7 +1,7 @@
 /*
   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
@@ -17,85 +17,59 @@
   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(_WIN32) && !defined(_WIN64)
 
 #  include <pthread.h>
 
 typedef pthread_mutex_t Lock;
-
-#  define lock_init(x, y) pthread_mutex_init(x, y)
-#  define lock_grab(x) pthread_mutex_lock(x)
-#  define lock_release(x) pthread_mutex_unlock(x)
-#  define lock_destroy(x) pthread_mutex_destroy(x)
-
+typedef pthread_cond_t WaitCondition;
+typedef pthread_t ThreadHandle;
+typedef void*(*start_fn)(void*);
+
+#  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)
+#  define thread_create(x,f,id) !pthread_create(&(x),NULL,(start_fn)f,&(id))
+#  define thread_join(x) pthread_join(x, NULL)
 
 #else
 
+#if !defined(NOMINMAX)
+#  define NOMINMAX // disable macros min() and max()
+#endif
+
 #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)
-#  define lock_grab(x) EnterCriticalSection(x)
-#  define lock_release(x) LeaveCriticalSection(x)
-#  define lock_destroy(x) DeleteCriticalSection(x)
-
+typedef HANDLE WaitCondition;
+typedef HANDLE ThreadHandle;
+
+#  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); }
+#  define thread_create(x,f,id) (x = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)f,&(id),0,NULL), x != NULL)
+#  define thread_join(x) { WaitForSingleObject(x, INFINITE); CloseHandle(x); }
 
 #endif