mirror of
https://github.com/UberGames/RPG-X2.git
synced 2024-11-26 14:21:08 +00:00
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/* Copyright (C) 2006 MySQL AB
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
/*
|
|
XXX 64-bit atomic operations can be implemented using
|
|
cmpxchg8b, if necessary. Though I've heard that not all 64-bit
|
|
architectures support double-word (128-bit) cas.
|
|
*/
|
|
|
|
#ifdef __x86_64__
|
|
# ifdef MY_ATOMIC_NO_XADD
|
|
# define MY_ATOMIC_MODE "gcc-amd64" LOCK_prefix "-no-xadd"
|
|
# else
|
|
# define MY_ATOMIC_MODE "gcc-amd64" LOCK_prefix
|
|
# endif
|
|
#else
|
|
# ifdef MY_ATOMIC_NO_XADD
|
|
# define MY_ATOMIC_MODE "gcc-x86" LOCK_prefix "-no-xadd"
|
|
# else
|
|
# define MY_ATOMIC_MODE "gcc-x86" LOCK_prefix
|
|
# endif
|
|
#endif
|
|
|
|
/* fix -ansi errors while maintaining readability */
|
|
#ifndef asm
|
|
#define asm __asm__
|
|
#endif
|
|
|
|
#ifndef MY_ATOMIC_NO_XADD
|
|
#define make_atomic_add_body(S) \
|
|
asm volatile (LOCK_prefix "; xadd %0, %1;" : "+r" (v) , "+m" (*a))
|
|
#endif
|
|
#define make_atomic_fas_body(S) \
|
|
asm volatile ("xchg %0, %1;" : "+r" (v) , "+m" (*a))
|
|
#define make_atomic_cas_body(S) \
|
|
asm volatile (LOCK_prefix "; cmpxchg %3, %0; setz %2;" \
|
|
: "+m" (*a), "+a" (*cmp), "=q" (ret): "r" (set))
|
|
|
|
#ifdef MY_ATOMIC_MODE_DUMMY
|
|
#define make_atomic_load_body(S) ret=*a
|
|
#define make_atomic_store_body(S) *a=v
|
|
#else
|
|
/*
|
|
Actually 32-bit reads/writes are always atomic on x86
|
|
But we add LOCK_prefix here anyway to force memory barriers
|
|
*/
|
|
#define make_atomic_load_body(S) \
|
|
ret=0; \
|
|
asm volatile (LOCK_prefix "; cmpxchg %2, %0" \
|
|
: "+m" (*a), "+a" (ret): "r" (ret))
|
|
#define make_atomic_store_body(S) \
|
|
asm volatile ("; xchg %0, %1;" : "+m" (*a), "+r" (v))
|
|
#endif
|
|
|
|
/* TODO test on intel whether the below helps. on AMD it makes no difference */
|
|
//#define LF_BACKOFF ({asm volatile ("rep; nop"); 1; })
|
|
|