linux-kernel - futex: wake explicit / wait on multiple memory locations

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Date:	Wed, 23 Jul 2014 12:25:24 -0400
From:	Milosz Tanski <milosz@...in.com>
To:	Ingo Molnar <mingo@...hat.com>
CC:	Thomas Gleixner <tglx@...esys.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Darren Hart <dvhltc@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: futex: wake explicit / wait on multiple memory locations

I'm using futexes to control scheduling for a userspace application with multiple queues. There's a global work queue and a specific pre-thread queue. And I would like to have a choice between waking up any thread or a specific thread.

Is there are mechanism in the futex API by which I can control which thread to wake up. Or alternatively a mechanism by which have a thread wait on multiple futex memory locations?

Thanks in advance,
- Milosz
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