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Re: [Qemu-devel] [PATCH 07/12] qemu-thread: add QemuSemaphore

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 07/12] qemu-thread: add QemuSemaphore
Date: Tue, 24 Jul 2012 18:55:32 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

Il 16/07/2012 16:20, Paolo Bonzini ha scritto:
>> > ...and that's why you check what needs to be done to handle this race
>> > after grabbing the mutex. IOW, replicate the state information that the
>> > Windows semaphore contains into the emulated condition variable object.
> It is already there (cv->waiters), but it is accessed atomically.  To do
> what you suggest I would need to add a mutex.

FWIW, I found a good condvar implementation in Chromium, but I really
don't have the time to port it over to QEMU right now.  I still would
like to get the semaphore version in 1.2.

Also, the attached pseudo-patch is an example of using semaphores to
limit the size of the critical sections, and also decrease the number of
threads created.  I'm not proposing to include it now, it's just an
example of things that are harder with condition variables than with


Attachment: thread-pool-sem.patch
Description: Text Data

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