Messages in this thread | | | Date | Thu, 16 Feb 2012 14:27:33 +0000 | From | Matthew Garrett <> | Subject | Re: [PATCH] hrtimers: Special-case zero length sleeps |
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On Wed, Feb 15, 2012 at 08:47:57PM +0000, Matthew Garrett wrote:
> Ok. I'll work on finding how prevelant it is and see if we can kill it > off in userspace.
Checking through an exploded Fedora kernel tree suggests around 125 packages out of 11000 or so, so around 1% of userspace seems to use sleep(0) under certain circumstances. We can probably fix everything in the distribution, but that suggests that there's also going to be a significant amount of code in the outside world that's also broken.
Userspace clearly has an expectation that sleep(0) is magic in some ill-defined way. We'd be well within our rights to break that expectation, but I think it's common enough to warrant special casing.
-- Matthew Garrett | mjg59@srcf.ucam.org
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