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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cutils/atomic.h>
#include <cutils/atomic-inline.h>
#ifdef HAVE_WIN32_THREADS
#include <windows.h>
#else
#include <sched.h>
#endif
/*****************************************************************************/
#if defined(HAVE_MACOSX_IPC)
#include <libkern/OSAtomic.h>
int32_t android_atomic_acquire_load(volatile int32_t* addr) {
int32_t value = *addr;
OSMemoryBarrier();
return value;
}
int32_t android_atomic_release_load(volatile int32_t* addr) {
OSMemoryBarrier();
return *addr;
}
void android_atomic_acquire_store(int32_t value, volatile int32_t* addr) {
*addr = value;
OSMemoryBarrier();
}
void android_atomic_release_store(int32_t value, volatile int32_t* addr) {
OSMemoryBarrier();
*addr = value;
}
int32_t android_atomic_inc(volatile int32_t* addr) {
return OSAtomicIncrement32Barrier((int32_t*)addr)-1;
}
int32_t android_atomic_dec(volatile int32_t* addr) {
return OSAtomicDecrement32Barrier((int32_t*)addr)+1;
}
int32_t android_atomic_add(int32_t value, volatile int32_t* addr) {
return OSAtomicAdd32Barrier(value, (int32_t*)addr)-value;
}
int32_t android_atomic_and(int32_t value, volatile int32_t* addr) {
return OSAtomicAnd32OrigBarrier(value, (int32_t*)addr);
}
int32_t android_atomic_or(int32_t value, volatile int32_t* addr) {
return OSAtomicOr32OrigBarrier(value, (int32_t*)addr);
}
int32_t android_atomic_acquire_swap(int32_t value, volatile int32_t* addr) {
int32_t oldValue;
do {
oldValue = *addr;
} while (android_atomic_acquire_cas(oldValue, value, addr));
return oldValue;
}
int32_t android_atomic_release_swap(int32_t value, volatile int32_t* addr) {
int32_t oldValue;
do {
oldValue = *addr;
} while (android_atomic_release_cas(oldValue, value, addr));
return oldValue;
}
int android_atomic_release_cas(int32_t oldvalue, int32_t newvalue, volatile int32_t* addr) {
/* OS X CAS returns zero on failure; invert to return zero on success */
return OSAtomicCompareAndSwap32Barrier(oldvalue, newvalue, (int32_t*)addr) == 0;
}
int android_atomic_acquire_cas(int32_t oldvalue, int32_t newvalue,
volatile int32_t* addr) {
int result = (OSAtomicCompareAndSwap32(oldvalue, newvalue, (int32_t*)addr) == 0);
if (result == 0) {
/* success, perform barrier */
OSMemoryBarrier();
}
return result;
}
/*****************************************************************************/
#elif defined(__i386__) || defined(__x86_64__)
int32_t android_atomic_acquire_load(volatile int32_t* addr) {
int32_t value = *addr;
ANDROID_MEMBAR_FULL();
return value;
}
int32_t android_atomic_release_load(volatile int32_t* addr) {
ANDROID_MEMBAR_FULL();
return *addr;
}
void android_atomic_acquire_store(int32_t value, volatile int32_t* addr) {
*addr = value;
ANDROID_MEMBAR_FULL();
}
void android_atomic_release_store(int32_t value, volatile int32_t* addr) {
ANDROID_MEMBAR_FULL();
*addr = value;
}
int32_t android_atomic_inc(volatile int32_t* addr) {
return android_atomic_add(1, addr);
}
int32_t android_atomic_dec(volatile int32_t* addr) {
return android_atomic_add(-1, addr);
}
int32_t android_atomic_add(int32_t value, volatile int32_t* addr) {
int32_t oldValue;
do {
oldValue = *addr;
} while (android_atomic_release_cas(oldValue, oldValue+value, addr));
return oldValue;
}
int32_t android_atomic_and(int32_t value, volatile int32_t* addr) {
int32_t oldValue;
do {
oldValue = *addr;
} while (android_atomic_release_cas(oldValue, oldValue&value, addr));
return oldValue;
}
int32_t android_atomic_or(int32_t value, volatile int32_t* addr) {
int32_t oldValue;
do {
oldValue = *addr;
} while (android_atomic_release_cas(oldValue, oldValue|value, addr));
return oldValue;
}
/* returns 0 on successful swap */
static inline int cas(int32_t oldvalue, int32_t newvalue,
volatile int32_t* addr) {
int xchg;
asm volatile
(
" lock; cmpxchg %%ecx, (%%edx);"
" setne %%al;"
" andl $1, %%eax"
: "=a" (xchg)
: "a" (oldvalue), "c" (newvalue), "d" (addr)
);
return xchg;
}
int32_t android_atomic_acquire_swap(int32_t value, volatile int32_t* addr) {
int32_t oldValue;
do {
oldValue = *addr;
} while (cas(oldValue, value, addr));
ANDROID_MEMBAR_FULL();
return oldValue;
}
int32_t android_atomic_release_swap(int32_t value, volatile int32_t* addr) {
ANDROID_MEMBAR_FULL();
int32_t oldValue;
do {
oldValue = *addr;
} while (cas(oldValue, value, addr));
return oldValue;
}
int android_atomic_acquire_cas(int32_t oldvalue, int32_t newvalue,
volatile int32_t* addr) {
int xchg = cas(oldvalue, newvalue, addr);
if (xchg == 0)
ANDROID_MEMBAR_FULL();
return xchg;
}
int android_atomic_release_cas(int32_t oldvalue, int32_t newvalue,
volatile int32_t* addr) {
ANDROID_MEMBAR_FULL();
int xchg = cas(oldvalue, newvalue, addr);
return xchg;
}
/*****************************************************************************/
#elif __arm__
// implementation for ARM is in atomic-android-arm.s.
/*****************************************************************************/
#elif __sh__
// implementation for SuperH is in atomic-android-sh.c.
#else
#error "Unsupported atomic operations for this platform"
#endif
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