diff options
Diffstat (limited to 'linuxthreads/spinlock.h')
| -rw-r--r-- | linuxthreads/spinlock.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h index d1da3c1..1145c72 100644 --- a/linuxthreads/spinlock.h +++ b/linuxthreads/spinlock.h @@ -106,7 +106,39 @@ static inline int __pthread_trylock (struct _pthread_fastlock * lock) return 0; } +/* Variation of internal lock used for pthread_mutex_t, supporting + timed-out waits. Warning: do not mix these operations with the above ones + over the same lock object! */ + +extern void __pthread_alt_lock(struct _pthread_fastlock * lock, + pthread_descr self); + +extern int __pthread_alt_timedlock(struct _pthread_fastlock * lock, + pthread_descr self, const struct timespec *abstime); + +extern void __pthread_alt_unlock(struct _pthread_fastlock *lock); + +static inline void __pthread_alt_init_lock(struct _pthread_fastlock * lock) +{ + lock->__status = 0; + lock->__spinlock = 0; +} + +static inline int __pthread_alt_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; +} + +/* Initializers for both lock variants */ + #define LOCK_INITIALIZER {0, 0} +#define ALT_LOCK_INITIALIZER {0, 0} /* Operations on pthread_atomic, which is defined in internals.h */ |