atomic-compat.h

/*
 
 atomic-compat.h
 
 This is the API for a compatibility package for whatever OS-supplied atomic operators are to be found on your
 platform.  It was originally implemented using MAC OS X  so the API is very similar to that.
 This file and atomic-compat.c can be conditionalized to support additional OS versions.
 
 Copyright 2009 Shel Kaphan
 
 This file is part of stmmap.
 
 stmmap is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 stmmap 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 Lesser General Public License for more details.
 
 You should have received a copy of the GNU Lesser General Public License
 along with stmmap.  If not, see <http://www.gnu.org/licenses/>.
 
 */

#define USE_ATOMIC_BUILTINS


#ifdef USE_ATOMIC_BUILTINS

#include <stdint.h>

typedef int32_t atomic_lock;

#else

#include <libkern/OSAtomic.h>
typedef OSSpinLock atomic_lock;

#endif




void atomic_spin_lock_lock(atomic_lock *lock);

void atomic_spin_lock_unlock(atomic_lock *lock);

int32_t atomic_increment_32(int32_t *addr);

int32_t atomic_decrement_32(int32_t *addr);

int32_t atomic_compare_and_swap_32(int32_t oldval, int32_t newval, int32_t *addr);