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| author | Greg Ames <gregames@apache.org> | 2003-12-08 19:49:16 +0000 |
|---|---|---|
| committer | Greg Ames <gregames@apache.org> | 2003-12-08 19:49:16 +0000 |
| commit | 410c6b42740adb3a7c7f725d22f148fcfdfd56c8 (patch) | |
| tree | 57bf78576ff622ffd0c954b81afc10f88ff7d56e /atomic | |
| parent | 5abe85045383933d8d9c02e28683849f0301f7b7 (diff) | |
| download | apr-410c6b42740adb3a7c7f725d22f148fcfdfd56c8.tar.gz | |
add apr_atomic_cas32 for ppc with gcc.
Could someone try this with testatomic on Mac OS X? It should just
work, but I couldn't test it. moof no longer likes me.
git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@64816 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'atomic')
| -rw-r--r-- | atomic/unix/apr_atomic.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/atomic/unix/apr_atomic.c b/atomic/unix/apr_atomic.c index 19dc3e9e7..65d30bda5 100644 --- a/atomic/unix/apr_atomic.c +++ b/atomic/unix/apr_atomic.c @@ -175,6 +175,31 @@ APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint #endif /* (__linux__ || __EMX__ || __FreeBSD__) && __i386__ */ +#if defined(__PPC__) && defined(__GNUC__) && !APR_FORCE_ATOMIC_GENERIC +APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, + apr_uint32_t swap, + apr_uint32_t cmp) +{ + apr_uint32_t prev; + + asm volatile ("retry:\n\t" + "lwarx %0,0,%1\n\t" /* load prev and reserve */ + "cmpw %0,%3\n\t" /* does it match cmp? */ + "bne- exit\n\t" /* ...no, bail out */ + "stwcx. %2,0,%1\n\t" /* ...yes, conditionally + store swap */ + "bne- retry\n\t" /* start over if we lost + the reservation */ + "exit:" + : "=&r"(prev) /* output */ + : "r" (mem), "r" (swap), "r"(cmp) /* inputs */ + : "memory"); /* clobbered */ + return prev; +} +#define APR_OVERRIDE_ATOMIC_CAS32 + +#endif /* __PPC__ && __GNUC__ */ + #if !defined(apr_atomic_init) && !defined(APR_OVERRIDE_ATOMIC_INIT) #if APR_HAS_THREADS |