wdlatomic.h

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#ifndef _WDL_ATOMIC_H_
#define _WDL_ATOMIC_H_
 
#include "wdltypes.h"
 
#ifdef _WIN32
 
static int wdl_atomic_incr(int *v) { return (int) InterlockedIncrement((LONG *)v); }
static int wdl_atomic_decr(int *v) { return (int) InterlockedDecrement((LONG *)v); }
static int wdl_atomic_incr(volatile int *v) { return (int) InterlockedIncrement((LONG *)v); }
static int wdl_atomic_decr(volatile int *v) { return (int) InterlockedDecrement((LONG *)v); }
 
#elif (!defined(__APPLE__) || !defined(__ppc__)) && (defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2))))
 
static WDL_STATICFUNC_UNUSED int wdl_atomic_incr(int *v) { return __sync_add_and_fetch(v,1); }
static WDL_STATICFUNC_UNUSED int wdl_atomic_decr(int *v) { return __sync_add_and_fetch(v,~0); }
static WDL_STATICFUNC_UNUSED int wdl_atomic_incr(volatile int *v) { return __sync_add_and_fetch(v,1); }
static WDL_STATICFUNC_UNUSED int wdl_atomic_decr(volatile int *v) { return __sync_add_and_fetch(v,~0); }
 
#elif defined(__APPLE__)
// used by GCC < 4.2 on OSX
#include <libkern/OSAtomic.h>
 
static WDL_STATICFUNC_UNUSED int wdl_atomic_incr(int *v) { return (int) OSAtomicIncrement32Barrier((int32_t*)v); }
static WDL_STATICFUNC_UNUSED int wdl_atomic_decr(int *v) { return (int) OSAtomicDecrement32Barrier((int32_t*)v); }
static WDL_STATICFUNC_UNUSED int wdl_atomic_incr(volatile int *v) { return (int) OSAtomicIncrement32Barrier((int32_t*)v); }
static WDL_STATICFUNC_UNUSED int wdl_atomic_decr(volatile int *v) { return (int) OSAtomicDecrement32Barrier((int32_t*)v); }
#else
 
// unsupported! 
#pragma message("Need win32 or apple or gcc 4.2+ for wdlatomic.h, doh")
 
#endif
 
#endif