| OLD | NEW |
|---|
| (Empty) |
| 1 /* | |
| 2 * Copyright 2008, Google Inc. | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are | |
| 7 * met: | |
| 8 * | |
| 9 * * Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * * Redistributions in binary form must reproduce the above | |
| 12 * copyright notice, this list of conditions and the following disclaimer | |
| 13 * in the documentation and/or other materials provided with the | |
| 14 * distribution. | |
| 15 * * Neither the name of Google Inc. nor the names of its | |
| 16 * contributors may be used to endorse or promote products derived from | |
| 17 * this software without specific prior written permission. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 30 */ | |
| 31 | |
| 32 | |
| 33 #ifndef NATIVE_CLIENT_SRC_INCLUDE_LINUX_ATOMIC_OPS_LINUX_H_ | |
| 34 #define NATIVE_CLIENT_SRC_INCLUDE_LINUX_ATOMIC_OPS_LINUX_H_ 1 | |
| 35 | |
| 36 #include "native_client/src/include/portability.h" | |
| 37 #include <stdint.h> | |
| 38 | |
| 39 typedef int32_t Atomic32; | |
| 40 | |
| 41 static INLINE Atomic32 CompareAndSwap(volatile Atomic32* ptr, | |
| 42 Atomic32 old_value, | |
| 43 Atomic32 new_value) { | |
| 44 Atomic32 prev; | |
| 45 __asm__ __volatile__("lock; cmpxchgl %1,%2" | |
| 46 : "=a" (prev) | |
| 47 : "q" (new_value), "m" (*ptr), "0" (old_value) | |
| 48 : "memory"); | |
| 49 return prev; | |
| 50 } | |
| 51 | |
| 52 | |
| 53 static INLINE Atomic32 AtomicExchange(volatile Atomic32* ptr, | |
| 54 Atomic32 new_value) { | |
| 55 /* NOTE: The lock prefix is implicit for xchg. */ | |
| 56 __asm__ __volatile__("xchgl %1,%0" | |
| 57 : "=r" (new_value) | |
| 58 : "m" (*ptr), "0" (new_value) | |
| 59 : "memory"); | |
| 60 return new_value; /* Now it's the previous value. */ | |
| 61 } | |
| 62 | |
| 63 static INLINE Atomic32 AtomicIncrement(volatile Atomic32* ptr, | |
| 64 Atomic32 increment) { | |
| 65 Atomic32 temp = increment; | |
| 66 __asm__ __volatile__("lock; xaddl %0,%1" | |
| 67 : "+r" (temp), "+m" (*ptr) | |
| 68 : : "memory"); | |
| 69 /* temp now contains the previous value of *ptr */ | |
| 70 return temp + increment; | |
| 71 } | |
| 72 | |
| 73 #endif /* NATIVE_CLIENT_SRC_INCLUDE_LINUX_ATOMIC_OPS_LINUX_H_ */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 10913285:
Switch NaCl code to use GCC intrinsics for atomic ops. (Closed)
Base URL: http://src.chromium.org/native_client/trunk/src/native_client/