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Re: [Qemu-devel] [patch 04/10] qemu: introduce main_loop_break
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From: |
Markus Armbruster |
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Subject: |
Re: [Qemu-devel] [patch 04/10] qemu: introduce main_loop_break |
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Date: |
Fri, 03 Apr 2009 16:08:32 +0200 |
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User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux) |
Anthony Liguori <address@hidden> writes:
> Marcelo Tosatti wrote:
>> I didnt know. Anthony wrote this code, so I'll let him comment.
>>
> Is this guaranteed by Posix and reliable across Unixes? In general, I
> think it's better to be conservative with this sort of thing.
For what it's worth, POSIX.1-2001 guarantees atomicity of up to PIPE_BUF
bytes, and PIPE_BUF must be at least 512. See pipe(7). More modern
chapter & verse is online:
http://www.opengroup.org/onlinepubs/009695399/functions/write.html
http://www.opengroup.org/onlinepubs/009695399/basedefs/limits.h.html
A note on select() bugs related to PIPE_BUF in some ancient crap:
http://cr.yp.to/docs/unixport.html