diff options
| -rw-r--r-- | linuxthreads/spinlock.h | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h index a6f682c..29f0304 100644 --- a/linuxthreads/spinlock.h +++ b/linuxthreads/spinlock.h @@ -12,20 +12,6 @@ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* GNU Library General Public License for more details. */ -/* Internal locks */ - -extern void __pthread_lock(struct _pthread_fastlock * lock); -extern int __pthread_trylock(struct _pthread_fastlock * lock); -extern void __pthread_unlock(struct _pthread_fastlock * lock); - -static inline void __pthread_init_lock(struct _pthread_fastlock * lock) -{ - lock->__status = 0; - lock->__spinlock = 0; -} - -#define LOCK_INITIALIZER {0, 0} - #if defined(TEST_FOR_COMPARE_AND_SWAP) extern int __pthread_has_cas; @@ -35,7 +21,7 @@ extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval, static inline int compare_and_swap(long * ptr, long oldval, long newval, int * spinlock) { - if (__pthread_has_cas) + if (__builtin_expect (__pthread_has_cas, 1)) return __compare_and_swap(ptr, oldval, newval); else return __pthread_compare_and_swap(ptr, oldval, newval, spinlock); @@ -61,3 +47,28 @@ static inline int compare_and_swap(long * ptr, long oldval, long newval, } #endif + +/* Internal locks */ + +extern void internal_function __pthread_lock(struct _pthread_fastlock * lock, + pthread_descr self); +extern void internal_function __pthread_unlock(struct _pthread_fastlock *lock); + +static inline void __pthread_init_lock(struct _pthread_fastlock * lock) +{ + lock->__status = 0; + lock->__spinlock = 0; +} + +static inline int __pthread_trylock (struct _pthread_fastlock * lock) +{ + long oldstatus; + + do { + oldstatus = lock->__status; + if (oldstatus != 0) return EBUSY; + } while(! compare_and_swap(&lock->__status, 0, 1, &lock->__spinlock)); + return 0; +} + +#define LOCK_INITIALIZER {0, 0} |