bionic/libc/private/bionic_atomic_x86.h
Elliott Hughes bfbf7a4300 Remove remaining bionic support for TARGET_CPU_SMP being false.
Change-Id: I02a0a1c0ae55ccb5c45d17fb99a09c374d71def4
2014-11-17 10:06:20 -08:00

59 lines
2.1 KiB
C

/*
* Copyright (C) 2011 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.
*/
#ifndef BIONIC_ATOMIC_X86_H
#define BIONIC_ATOMIC_X86_H
/* Define a full memory barrier, this is only needed if we build the
* platform for a multi-core device.
*/
__ATOMIC_INLINE__ void __bionic_memory_barrier() {
__asm__ __volatile__ ( "mfence" : : : "memory" );
}
/* Compare-and-swap, without any explicit barriers. Note that this function
* returns 0 on success, and 1 on failure. The opposite convention is typically
* used on other platforms.
*/
__ATOMIC_INLINE__ int __bionic_cmpxchg(int32_t old_value, int32_t new_value, volatile int32_t* ptr) {
int32_t prev;
__asm__ __volatile__ ("lock; cmpxchgl %1, %2"
: "=a" (prev)
: "q" (new_value), "m" (*ptr), "0" (old_value)
: "memory");
return prev != old_value;
}
/* Swap, without any explicit barriers. */
__ATOMIC_INLINE__ int32_t __bionic_swap(int32_t new_value, volatile int32_t *ptr) {
__asm__ __volatile__ ("xchgl %1, %0"
: "=r" (new_value)
: "m" (*ptr), "0" (new_value)
: "memory");
return new_value;
}
/* Atomic decrement, without explicit barriers. */
__ATOMIC_INLINE__ int32_t __bionic_atomic_dec(volatile int32_t* ptr) {
int increment = -1;
__asm__ __volatile__ ("lock; xaddl %0, %1"
: "+r" (increment), "+m" (*ptr)
: : "memory");
/* increment now holds the old value of *ptr */
return increment;
}
#endif /* BIONIC_ATOMIC_X86_H */