/*
  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
  Copyright (C) 2008-2010 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
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  Stockfish is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#if !defined(LOCK_H_INCLUDED)
#define LOCK_H_INCLUDED

#if !defined(_MSC_VER)

#  include <pthread.h>

typedef pthread_mutex_t Lock;
typedef pthread_cond_t WaitCondition;

#  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)

#else

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#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 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); }
#endif

#endif

#endif // !defined(LOCK_H_INCLUDED)
