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#pragma once
#include "../system.h"
/*
atomic_inc - should return the value after increment
atomic_dec - should return the value after decrement
atomic_compswap - should return the value before the eventual swap
*/
#if defined(__GNUC__)
inline unsigned atomic_inc(volatile unsigned *pValue)
{
return __sync_fetch_and_add(pValue, 1);
}
inline unsigned atomic_dec(volatile unsigned *pValue)
{
return __sync_fetch_and_add(pValue, -1);
}
inline unsigned atomic_compswap(volatile unsigned *pValue, unsigned comperand, unsigned value)
{
return __sync_val_compare_and_swap(pValue, comperand, value);
}
inline void sync_barrier()
{
__sync_synchronize();
}
#elif defined(_MSC_VER)
#include <intrin.h>
inline unsigned atomic_inc(volatile unsigned *pValue)
{
return _InterlockedIncrement((volatile long *)pValue);
}
inline unsigned atomic_dec(volatile unsigned *pValue)
{
return _InterlockedDecrement((volatile long *)pValue);
}
inline unsigned atomic_compswap(volatile unsigned *pValue, unsigned comperand, unsigned value)
{
return _InterlockedCompareExchange((volatile long *)pValue, (long)value, (long)comperand);
}
inline void sync_barrier()
{
_ReadWriteBarrier();
}
#else
#error missing atomic implementation for this compiler
#endif
#if defined(CONF_PLATFORM_MACOSX)
/*
use semaphore provided by SDL on macosx
*/
#else
class semaphore
{
SEMAPHORE sem;
public:
semaphore() { semaphore_init(&sem); }
~semaphore() { semaphore_destroy(&sem); }
void wait() { semaphore_wait(&sem); }
void signal() { semaphore_signal(&sem); }
};
#endif
class lock
{
friend class scope_lock;
LOCK var;
void take() { lock_wait(var); }
void release() { lock_release(var); }
public:
lock()
{
var = lock_create();
}
~lock()
{
lock_destroy(var);
}
};
class scope_lock
{
lock *var;
public:
scope_lock(lock *l)
{
var = l;
var->take();
}
~scope_lock()
{
var->release();
}
};
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