<commit_before>#ifndef __CAAtomicStack_h__
#define __CAAtomicStack_h__

#ifdef MACOSX
#include <libkern/OSAtomic.h>
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
#include <CoreServices/CoreServices.h>
#endif
#elif defined(LINUX)
template <class T>
static bool	compare_and_swap(T *oldvalue, T *newvalue, T **pvalue);
#endif

#ifndef NULL
#define NULL ((void*)0)
#endif<commit_msg>Proper define of NULL<commit_after>#ifndef __CAAtomicStack_h__
#define __CAAtomicStack_h__

#ifdef MACOSX
#include <libkern/OSAtomic.h>
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
#include <CoreServices/CoreServices.h>
#endif
#elif defined(LINUX)
template <class T>
static bool	compare_and_swap(T *oldvalue, T *newvalue, T **pvalue);
#endif

#ifndef NULL
#define NULL 0
#endif
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