diff options
Diffstat (limited to 'linuxthreads/spinlock.h')
| -rw-r--r-- | linuxthreads/spinlock.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h index 6609ef71c9..435271d812 100644 --- a/linuxthreads/spinlock.h +++ b/linuxthreads/spinlock.h @@ -105,7 +105,7 @@ static inline int __pthread_trylock (struct _pthread_fastlock * lock) #if defined TEST_FOR_COMPARE_AND_SWAP if (!__pthread_has_cas) #endif -#if !defined HAS_COMPARE_AND_SWAP +#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP { return (testandset(&lock->__spinlock) ? EBUSY : 0); } @@ -140,13 +140,26 @@ static inline void __pthread_alt_init_lock(struct _pthread_fastlock * lock) static inline int __pthread_alt_trylock (struct _pthread_fastlock * lock) { +#if defined HAS_COMPARE_AND_SWAP long oldstatus; +#endif + +#if defined TEST_FOR_COMPARE_AND_SWAP + if (!__pthread_has_cas) +#endif +#if !defined HAS_COMPARE_AND_SWAP || defined TEST_FOR_COMPARE_AND_SWAP + { + return (testandset(&lock->__spinlock) ? EBUSY : 0); + } +#endif +#if defined HAS_COMPARE_AND_SWAP do { oldstatus = lock->__status; if (oldstatus != 0) return EBUSY; } while(! compare_and_swap(&lock->__status, 0, 1, &lock->__spinlock)); return 0; +#endif } /* Initializers for both lock variants */ |