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rwlock: Fix explicit hand-over (bug 21298)

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Without this fix, the rwlock can fail to execute the explicit hand-over
in certain cases (e.g., empty critical sections that switch quickly between
read and write phases).  This can then lead to errors in how __wrphase_futex
is accessed, which in turn can lead to deadlocks.
This commit is contained in:
Carlos O'Donell
2017-07-28 00:22:44 -04:00
parent 2557ae38f3
commit faf8c066df
12 changed files with 557 additions and 241 deletions
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8
support/xthread.h
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@ -74,6 +74,14 @@ void xpthread_attr_setguardsize (pthread_attr_t *attr,
PTHREAD_BARRIER_SERIAL_THREAD. */
int xpthread_barrier_wait (pthread_barrier_t *barrier);
void xpthread_rwlock_init (pthread_rwlock_t *rwlock,
const pthread_rwlockattr_t *attr);
void xpthread_rwlockattr_init (pthread_rwlockattr_t *attr);
void xpthread_rwlockattr_setkind_np (pthread_rwlockattr_t *attr, int pref);
void xpthread_rwlock_wrlock (pthread_rwlock_t *rwlock);
void xpthread_rwlock_rdlock (pthread_rwlock_t *rwlock);
void xpthread_rwlock_unlock (pthread_rwlock_t *rwlock);
__END_DECLS
#endif /* SUPPORT_THREAD_H */