372f3178f8
I'm not sure if they're even used, but they were rather ugly and are set to get even uglier since they don't follow normal conventions (missing exchange, and cas not returning the original value).
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
#ifndef AL_ATOMIC_H
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#define AL_ATOMIC_H
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typedef void *volatile XchgPtr;
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#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && !defined(__QNXNTO__)
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typedef unsigned int RefCount;
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inline RefCount IncrementRef(volatile RefCount *ptr)
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{ return __sync_add_and_fetch(ptr, 1); }
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inline RefCount DecrementRef(volatile RefCount *ptr)
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{ return __sync_sub_and_fetch(ptr, 1); }
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inline int ExchangeInt(volatile int *ptr, int newval)
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{
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return __sync_lock_test_and_set(ptr, newval);
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}
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inline void *ExchangePtr(XchgPtr *ptr, void *newval)
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{
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return __sync_lock_test_and_set(ptr, newval);
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}
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inline ALboolean CompExchangeInt(volatile int *ptr, int oldval, int newval)
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{
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return __sync_bool_compare_and_swap(ptr, oldval, newval);
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}
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inline ALboolean CompExchangePtr(XchgPtr *ptr, void *oldval, void *newval)
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{
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return __sync_bool_compare_and_swap(ptr, oldval, newval);
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}
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#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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inline unsigned int xaddl(volatile unsigned int *dest, int incr)
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{
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unsigned int ret;
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__asm__ __volatile__("lock; xaddl %0,(%1)"
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: "=r" (ret)
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: "r" (dest), "0" (incr)
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: "memory");
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return ret;
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}
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typedef unsigned int RefCount;
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inline RefCount IncrementRef(volatile RefCount *ptr)
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{ return xaddl(ptr, 1)+1; }
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inline RefCount DecrementRef(volatile RefCount *ptr)
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{ return xaddl(ptr, -1)-1; }
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inline int ExchangeInt(volatile int *dest, int newval)
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{
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int ret;
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__asm__ __volatile__("lock; xchgl %0,(%1)"
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: "=r" (ret)
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: "r" (dest), "0" (newval)
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: "memory");
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return ret;
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}
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inline ALboolean CompExchangeInt(volatile int *dest, int oldval, int newval)
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{
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int ret;
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__asm__ __volatile__("lock; cmpxchgl %2,(%1)"
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: "=a" (ret)
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: "r" (dest), "r" (newval), "0" (oldval)
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: "memory");
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return ret == oldval;
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}
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inline void *ExchangePtr(XchgPtr *dest, void *newval)
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{
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void *ret;
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__asm__ __volatile__(
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#ifdef __i386__
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"lock; xchgl %0,(%1)"
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#else
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"lock; xchgq %0,(%1)"
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#endif
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: "=r" (ret)
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: "r" (dest), "0" (newval)
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: "memory"
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);
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return ret;
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}
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inline ALboolean CompExchangePtr(XchgPtr *dest, void *oldval, void *newval)
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{
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void *ret;
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__asm__ __volatile__(
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#ifdef __i386__
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"lock; cmpxchgl %2,(%1)"
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#else
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"lock; cmpxchgq %2,(%1)"
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#endif
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: "=a" (ret)
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: "r" (dest), "r" (newval), "0" (oldval)
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: "memory"
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);
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return ret == oldval;
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}
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#elif defined(_WIN32)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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typedef LONG RefCount;
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inline RefCount IncrementRef(volatile RefCount *ptr)
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{ return InterlockedIncrement(ptr); }
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inline RefCount DecrementRef(volatile RefCount *ptr)
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{ return InterlockedDecrement(ptr); }
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extern ALbyte LONG_size_does_not_match_int[(sizeof(LONG)==sizeof(int))?1:-1];
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inline int ExchangeInt(volatile int *ptr, int newval)
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{
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union {
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volatile int *i;
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volatile LONG *l;
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} u = { ptr };
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return InterlockedExchange(u.l, newval);
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}
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inline void *ExchangePtr(XchgPtr *ptr, void *newval)
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{
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return InterlockedExchangePointer(ptr, newval);
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}
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inline ALboolean CompExchangeInt(volatile int *ptr, int oldval, int newval)
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{
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union {
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volatile int *i;
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volatile LONG *l;
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} u = { ptr };
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return InterlockedCompareExchange(u.l, newval, oldval) == oldval;
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}
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inline ALboolean CompExchangePtr(XchgPtr *ptr, void *oldval, void *newval)
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{
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return InterlockedCompareExchangePointer(ptr, newval, oldval) == oldval;
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}
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#else
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#error "No atomic functions available on this platform!"
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typedef ALuint RefCount;
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#endif
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#endif /* AL_ATOMIC_H */
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