Re: Threads not waking on pthread_cond_signal()

[Ulrich Drepper <drepper redhat com>]

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Ian Wienand wrote:

> Possibly the difference is that with requeue there are two futex calls
> (one to move the queue, one to wake up a thread), where as the old
> codepath only has one?

Certainly, this is known to cause some slowdown.  The elimination of the
worst case  behavior has a price.

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