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Readd SRWLOCK and Condition Variables under Windows

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And set them as default.

Introduce compile switch OLD_LOCKS to allow to fallback on
compatible locks supported by Windows XP and older versions.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-01-03 10:49:33 +01:00
parent 22ede4442c
commit 5973e09854
2 changed files with 25 additions and 0 deletions
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21
src/lock.h
View file

@ -44,6 +44,25 @@ typedef pthread_cond_t WaitCondition;
#include <windows.h> #include <windows.h>
#undef WIN32_LEAN_AND_MEAN #undef WIN32_LEAN_AND_MEAN
// Default fast and race free locks and condition variables
#if !defined(OLD_LOCKS)
typedef SRWLOCK Lock;
typedef CONDITION_VARIABLE WaitCondition;
# define lock_init(x) InitializeSRWLock(x)
# define lock_grab(x) AcquireSRWLockExclusive(x)
# define lock_release(x) ReleaseSRWLockExclusive(x)
# define lock_destroy(x) (x)
# define cond_destroy(x) (x)
# define cond_init(x) InitializeConditionVariable(x)
# define cond_signal(x) WakeConditionVariable(x)
# define cond_wait(x,y) SleepConditionVariableSRW(x, y, INFINITE,0)
// Fallback solution to build for Windows XP and older versions, note that
// cond_wait() is racy between lock_release() and WaitForSingleObject().
#else
typedef CRITICAL_SECTION Lock; typedef CRITICAL_SECTION Lock;
typedef HANDLE WaitCondition; typedef HANDLE WaitCondition;
@ -57,4 +76,6 @@ typedef HANDLE WaitCondition;
# define cond_wait(x,y) { lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); } # define cond_wait(x,y) { lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); }
#endif #endif
#endif
#endif // !defined(LOCK_H_INCLUDED) #endif // !defined(LOCK_H_INCLUDED)

4
src/types.h
View file

@ -70,6 +70,10 @@ typedef uint64_t Bitboard;
//// -DUSE_POPCNT | Add runtime support for use of popcnt asm-instruction. //// -DUSE_POPCNT | Add runtime support for use of popcnt asm-instruction.
//// | Works only in 64-bit mode. For compiling requires hardware //// | Works only in 64-bit mode. For compiling requires hardware
//// | with popcnt support. Around 4% speed-up. //// | with popcnt support. Around 4% speed-up.
////
//// -DOLD_LOCKS | By default under Windows are used the fast Slim Reader/Writer (SRW)
//// | Locks and Condition Variables: these are not supported by Windows XP
//// | and older, to compile for those platforms you should enable OLD_LOCKS.
// Automatic detection for 64-bit under Windows // Automatic detection for 64-bit under Windows
#if defined(_WIN64) #if defined(_WIN64)