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[Qemu-devel] Re: [PATCH 2/2] vnc: don't mess up with iohandlers in the v

From: Paolo Bonzini
Subject: [Qemu-devel] Re: [PATCH 2/2] vnc: don't mess up with iohandlers in the vnc thread
Date: Thu, 10 Mar 2011 14:58:21 +0100
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On 03/10/2011 02:54 PM, Corentin Chary wrote:
> >  You can use a bottom half for this instead of a special socket. Signaling
> >  a bottom half is async-signal- and thread-safe.
>  Bottom halves are thread safe?
>  I don't think so.

The bottom halves API is not thread safe, but calling

Not _idle please.

in another thread *seems* to be safe (here, it
would be protected from qemu_bh_delete() by vnc_lock_output()).

If it weren't protected against qemu_bh_delete, you would have already the same race between writing to the socket and closing it in another thread.


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