RepoMirrors/haproxy
1
0
Fork 0
mirror of http://git.haproxy.org/git/haproxy.git/ synced 2025-02-18 11:47:03 +00:00
Code Issues Packages Projects Releases Wiki Activity

MINOR: threads/atomic: implement pl_mb() in asm on x86

Browse Source 
[ plock commit 44081ea493dd78dab48076980e881748e9b33db5 ]

Older compilers (eg: gcc 3.4) don't provide __sync_synchronize() so let's
do it by hand on this platform.
This commit is contained in:
Willy Tarreau 2017-07-18 15:01:39 +02:00
parent f7ba77eb80
commit 01b8398b9e
1 changed files with 18 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
include/import/atomic-ops.h
View File

@ -8,14 +8,22 @@ static inline void pl_barrier()
asm volatile("" ::: "memory"); asm volatile("" ::: "memory");
} }
/* full memory barrier */ #if defined(__i386__) || defined (__i486__) || defined (__i586__) || defined (__i686__) || defined (__x86_64__)
/* full memory barrier using mfence when SSE2 is supported, falling back to
* "lock add %esp" (gcc uses "lock add" or "lock or").
*/
static inline void pl_mb() static inline void pl_mb()
{ {
__sync_synchronize(); #if defined(__SSE2__)
asm volatile("mfence" ::: "memory");
#elif defined(__x86_64__)
asm volatile("lock addl $0,0 (%%rsp)" ::: "memory", "cc");
#else
asm volatile("lock addl $0,0 (%%esp)" ::: "memory", "cc");
#endif
} }
#if defined(__i386__) || defined (__i486__) || defined (__i586__) || defined (__i686__) || defined (__x86_64__)
/* /*
* Generic functions common to the x86 family * Generic functions common to the x86 family
*/ */
@ -488,6 +496,12 @@ static inline void pl_cpu_relax()
asm volatile(""); asm volatile("");
} }
/* full memory barrier */
static inline void pl_mb()
{
__sync_synchronize();
}
#define pl_inc_noret(ptr) ({ __sync_add_and_fetch((ptr), 1); }) #define pl_inc_noret(ptr) ({ __sync_add_and_fetch((ptr), 1); })
#define pl_dec_noret(ptr) ({ __sync_sub_and_fetch((ptr), 1); }) #define pl_dec_noret(ptr) ({ __sync_sub_and_fetch((ptr), 1); })
#define pl_inc(ptr) ({ __sync_add_and_fetch((ptr), 1); }) #define pl_inc(ptr) ({ __sync_add_and_fetch((ptr), 1); })