diff options
Diffstat (limited to 'linuxthreads/spinlock.h')
| -rw-r--r-- | linuxthreads/spinlock.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h index 1145c72636..96f39551dd 100644 --- a/linuxthreads/spinlock.h +++ b/linuxthreads/spinlock.h @@ -81,6 +81,7 @@ static inline int compare_and_swap(long * ptr, long oldval, long newval, #ifndef HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS #define compare_and_swap_with_release_semantics compare_and_swap +#define __compare_and_swap_with_release_semantics __compare_and_swap #endif /* Internal locks */ @@ -97,13 +98,26 @@ static inline void __pthread_init_lock(struct _pthread_fastlock * lock) static inline int __pthread_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 + { + 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 } /* Variation of internal lock used for pthread_mutex_t, supporting |