diff options
Diffstat (limited to 'cas.h')
| -rw-r--r-- | cas.h | 40 |
1 files changed, 0 insertions, 40 deletions
@@ -1,40 +0,0 @@ -/* - * File : cas.c - * Author : Jérémy Zurcher <jeremy@asynk.ch> - * Date : 01/11/09 - * License : - * - * Permission is hereby granted, free of charge, to any person obtaining - * a copy of this software and associated documentation files (the - * "Software"), to deal in the Software without restriction, including - * without limitation the rights to use, copy, modify, merge, publish, - * distribute, sublicense, and/or sell copies of the Software, and to - * permit persons to whom the Software is furnished to do so, subject to - * the following conditions: - * - * The above copyright notice and this permission notice shall be - * included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE - * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION - * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION - * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - * - */ - -/* CMPXCHG8B m64 Compare EDX:EAX with m64. If equal, set ZF and load ECX:EBX into m64. Else, clear ZF and load m64 into EDX:EAX. */ -static inline unsigned int compare_and_swap(volatile unsigned long long *mem, - volatile unsigned long long old, - volatile unsigned long long new) { - char result; - __asm__ __volatile__("lock; cmpxchg8b %0; setz %1;" - : "=m"(*mem), "=q"(result) - : "m"(*mem), "d" ((unsigned long)(old>>32)), "a" ((unsigned long)old), - "c" ((unsigned long)(new>>32)), "b" ((unsigned long)new) - : "memory"); - return (int)result; -} - |