-/* Copyright (C) 2003-2013 Free Software Foundation, Inc.
+/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
++cond->__data.__wakeup_seq;
++cond->__data.__futex;
- /* Wake one. */
- if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex, 1,
- 1, &cond->__data.__lock,
- pshared), 0))
- return 0;
+#if (defined lll_futex_cmp_requeue_pi \
+ && defined __ASSUME_REQUEUE_PI)
+ pthread_mutex_t *mut = cond->__data.__mutex;
+ if (USE_REQUEUE_PI (mut)
+ /* This can only really fail with a ENOSYS, since nobody can modify
+ futex while we have the cond_lock. */
+ && lll_futex_cmp_requeue_pi (&cond->__data.__futex, 1, 0,
+ &mut->__data.__lock,
+ cond->__data.__futex, pshared) == 0)
+ {
+ lll_unlock (cond->__data.__lock, pshared);
+ return 0;
+ }
+ else
+#endif
+ /* Wake one. */
+ if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex,
+ 1, 1,
+ &cond->__data.__lock,
+ pshared), 0))
+ return 0;
+
+ /* Fallback if neither of them work. */
lll_futex_wake (&cond->__data.__futex, 1, pshared);
}