123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
// Copyright (C) 2003 Dolphin Project.
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, version 2.0.
|
|
|
|
// This program 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 General Public License 2.0 for more details.
|
|
|
|
// A copy of the GPL 2.0 should have been included with the program.
|
|
// If not, see http://www.gnu.org/licenses/
|
|
|
|
// Official SVN repository and contact information can be found at
|
|
// http://code.google.com/p/dolphin-emu/
|
|
|
|
#ifndef _ATOMIC_GCC_H_
|
|
#define _ATOMIC_GCC_H_
|
|
|
|
#include "Common.h"
|
|
|
|
// Atomic operations are performed in a single step by the CPU. It is
|
|
// impossible for other threads to see the operation "half-done."
|
|
//
|
|
// Some atomic operations can be combined with different types of memory
|
|
// barriers called "Acquire semantics" and "Release semantics", defined below.
|
|
//
|
|
// Acquire semantics: Future memory accesses cannot be relocated to before the
|
|
// operation.
|
|
//
|
|
// Release semantics: Past memory accesses cannot be relocated to after the
|
|
// operation.
|
|
//
|
|
// These barriers affect not only the compiler, but also the CPU.
|
|
|
|
namespace Common
|
|
{
|
|
|
|
inline void AtomicAdd(volatile u32& target, u32 value) {
|
|
__sync_add_and_fetch(&target, value);
|
|
}
|
|
|
|
inline void AtomicAnd(volatile u32& target, u32 value) {
|
|
__sync_and_and_fetch(&target, value);
|
|
}
|
|
|
|
inline void AtomicDecrement(volatile u32& target) {
|
|
__sync_add_and_fetch(&target, -1);
|
|
}
|
|
|
|
inline void AtomicIncrement(volatile u32& target) {
|
|
__sync_add_and_fetch(&target, 1);
|
|
}
|
|
|
|
inline u32 AtomicLoad(volatile u32& src) {
|
|
return src; // 32-bit reads are always atomic.
|
|
}
|
|
inline u32 AtomicLoadAcquire(volatile u32& src) {
|
|
__sync_synchronize(); // TODO: May not be necessary.
|
|
return src;
|
|
}
|
|
|
|
inline void AtomicOr(volatile u32& target, u32 value) {
|
|
__sync_or_and_fetch(&target, value);
|
|
}
|
|
|
|
inline void AtomicStore(volatile u32& dest, u32 value) {
|
|
dest = value; // 32-bit writes are always atomic.
|
|
}
|
|
inline void AtomicStoreRelease(volatile u32& dest, u32 value) {
|
|
__sync_lock_test_and_set(&dest, value); // TODO: Wrong! This function is has acquire semantics.
|
|
}
|
|
|
|
}
|
|
|
|
// Old code kept here for reference in case we need the parts with __asm__ __volatile__.
|
|
#if 0
|
|
LONG SyncInterlockedIncrement(LONG *Dest)
|
|
{
|
|
#if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__))
|
|
return __sync_add_and_fetch(Dest, 1);
|
|
#else
|
|
register int result;
|
|
__asm__ __volatile__("lock; xadd %0,%1"
|
|
: "=r" (result), "=m" (*Dest)
|
|
: "0" (1), "m" (*Dest)
|
|
: "memory");
|
|
return result;
|
|
#endif
|
|
}
|
|
|
|
LONG SyncInterlockedExchangeAdd(LONG *Dest, LONG Val)
|
|
{
|
|
#if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__))
|
|
return __sync_add_and_fetch(Dest, Val);
|
|
#else
|
|
register int result;
|
|
__asm__ __volatile__("lock; xadd %0,%1"
|
|
: "=r" (result), "=m" (*Dest)
|
|
: "0" (Val), "m" (*Dest)
|
|
: "memory");
|
|
return result;
|
|
#endif
|
|
}
|
|
|
|
LONG SyncInterlockedExchange(LONG *Dest, LONG Val)
|
|
{
|
|
#if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__))
|
|
return __sync_lock_test_and_set(Dest, Val);
|
|
#else
|
|
register int result;
|
|
__asm__ __volatile__("lock; xchg %0,%1"
|
|
: "=r" (result), "=m" (*Dest)
|
|
: "0" (Val), "m" (*Dest)
|
|
: "memory");
|
|
return result;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
#endif
|