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| author | Ulrich Drepper <drepper@redhat.com> | 2000-07-19 06:24:30 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2000-07-19 06:24:30 +0000 |
| commit | 056f707c8618062023a79fdbc6ec19ac482c63dd (patch) | |
| tree | fe3f8fffc0c85a938dd077474827d1f8c3bf6ec6 /linuxthreads/spinlock.h | |
| parent | a48297fdf310f0bf0fb29df1e185dd5f1561c1c1 (diff) | |
| download | glibc-056f707c8618062023a79fdbc6ec19ac482c63dd.zip glibc-056f707c8618062023a79fdbc6ec19ac482c63dd.tar.gz glibc-056f707c8618062023a79fdbc6ec19ac482c63dd.tar.bz2 | |
Update.
* spinlock.h (__pthread_alt_trylock): Fix code used if no
compare&swap is available.
Diffstat (limited to 'linuxthreads/spinlock.h')
| -rw-r--r-- | linuxthreads/spinlock.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h index 17efd18..703b72d 100644 --- a/linuxthreads/spinlock.h +++ b/linuxthreads/spinlock.h @@ -149,7 +149,19 @@ static inline int __pthread_alt_trylock (struct _pthread_fastlock * lock) #endif #if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP { - return (testandset(&lock->__spinlock) ? EBUSY : 0); + int res = EBUSY; + + if (testandset(&lock->__spinlock) == 0) + { + if (lock->__status == 0) + { + lock->__status = 1; + WRITE_MEMORY_BARRIER(); + res = 0; + } + lock->__spinlock = 0; + } + return res; } #endif |