Date: Tue, 28 Jul 2015 14:19:49 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: freebsd-current@freebsd.org Subject: eventfd lookalike in FreeBSD ? Message-ID: <20150728121949.GA64588@onelab2.iet.unipi.it>
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Hi, for some work we are doing on bhyve, we need some lightweight mechanism that a kernel thread can use to wake up another user thread possibly waiting for some event. If the recipient of the event were a kernel thread it would simply do a tsleep(chan...) and the sender would do a wakeup() or wakeup_one(). Do we have an equally simple option for a recipient that is a userspace thread using something that is already in the kernel ? Do we have some blocking syscall that ends up doing a tsleep in a predictable way ? I suppose I could create a kqueue() descriptor and instruct the kernel thread side to post an event instead of doing the wakeup, but this seems a bit more expensive on both endpoints. cheers luigi
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