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|
/*
+----------------------------------------------------------------------+
| Yet Another Cache |
+----------------------------------------------------------------------+
| Copyright (c) 2013-2013 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Xinchen Hui <laruence@php.net> |
| John Neo <nhf0424@gmail.com> |
+----------------------------------------------------------------------+
*/
#ifndef YAC_ATOMIC_H
#define YAC_ATOMIC_H
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_BUILTIN_ATOMIC
#define YAC_CAS(lock, old, set) __sync_bool_compare_and_swap(lock, old, set)
#elif ( __amd64__ || __amd64 || __x86_64__ || __i386__ || __i386 )
static inline int __yac_cas(unsigned int *lock, unsigned int old, unsigned int set) {
unsigned char res;
__asm__ volatile ( "lock;" "cmpxchgl %3, %1;" "sete %0;" :
"=a" (res) : "m" (*lock), "a" (old), "r" (set) : "memory");
return res;
}
#define YAC_CAS(lock, old, set) __yac_cas(lock, old, set)
#elif ZEND_WIN32
#define YAC_CAS(lock, old, set) (InterlockedCompareExchange(lock, set, old) == old)
#else
#undef YAC_CAS
#warning No atomic CAS supports
#endif
#ifdef YAC_CAS
#define MUT_READ 0x0
#define MUT_WRITE 0x1
#define CAS_MAX_SPIN 100
static inline int yac_mutex_write(unsigned int *me) {
int retry = 0;
while (!YAC_CAS(me, MUT_READ, MUT_WRITE)) {
if (++retry == CAS_MAX_SPIN) {
return 0;
}
}
return 1;
}
static inline void yac_mutex_read(unsigned int *me) {
*me = MUT_READ;
}
#define WRITEP(P) yac_mutex_write(&(P->mutex))
#define READP(P) yac_mutex_read(&(P->mutex))
#else
#undef YAC_CAS
#define WRITEP(P) (1)
#define READP(P)
#endif
#endif
|
