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| author | Ulrich Drepper <drepper@redhat.com> | 2003-03-20 19:42:54 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2003-03-20 19:42:54 +0000 |
| commit | 972209dd7a4df65e335ca1f9200929e412c0871c (patch) | |
| tree | dac418868a771c28830ab0c7433c603eb8669065 | |
| parent | f1f8a9ec6f428ccf7ff1b73252b69d57576fe7bb (diff) | |
| download | glibc-972209dd7a4df65e335ca1f9200929e412c0871c.tar.gz glibc-972209dd7a4df65e335ca1f9200929e412c0871c.tar.xz glibc-972209dd7a4df65e335ca1f9200929e412c0871c.zip | |
(atomic_decrement_if_positive): Adjust for the correct atomic_compare_and_exchange_acq semantics.
| -rw-r--r-- | include/atomic.h | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/include/atomic.h b/include/atomic.h index 87b2df8d21..f0cc8cb643 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -113,22 +113,21 @@ /* Decrement *MEM if it is > 0, and return the old value. */ #ifndef atomic_decrement_if_positive -# define atomic_decrement_if_positive(mem) \ - ({ __typeof (*mem) __val; \ - __typeof (*mem) __oldval; \ +# define atomic_decrement_if_positive(mem) \ + ({ __typeof (*mem) __oldval; \ __typeof (mem) __memp; \ - \ + \ __val = *__memp; \ do \ { \ - if (__builtin_expect (__val <= 0, 0)) \ + __oldval = *__memp; \ + if (__builtin_expect (__oldval <= 0, 0)) \ break; \ - __oldval = __val; \ - __val = atomic_compare_and_exchange_acq (__memp, __oldval - 1, \ - __oldval); \ } \ - while (__builtin_expect (__val != __oldval, 0)); \ - __val; }) + while (__builtin_expect (atomic_compare_and_exchange_acq (__memp, \ + __oldval - 1, \ + __oldval), 0));\ + __oldval; }) #endif |