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Re: [Qemu-devel] [PATCH] osdep: initialize glib threads in all QEMU tool
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] osdep: initialize glib threads in all QEMU tools |
Date: |
Sun, 23 Mar 2014 16:56:58 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Oct 08, 2013 at 11:58:31AM +0200, Stefan Hajnoczi wrote:
> glib versions prior to 2.31.0 require an explicit g_thread_init() call
> to enable multi-threading.
>
> Failure to initialize threading causes glib to take single-threaded code
> paths without synchronization. For example, the g_slice allocator will
> crash due to race conditions.
>
> Fix this for all QEMU tool programs (qemu-nbd, qemu-io, qemu-img) by
> moving the g_thread_init() call from vl.c:main() into a new
> osdep.c:thread_init() constructor function.
>
> thread_init() has __attribute__((constructor)) and is automatically
> invoked by the runtime during startup.
>
> We can now drop the "simple" trace backend's g_thread_init() call since
> thread_init() already called it.
>
> Note that we must keep coroutine-gthread.c's g_thread_init() call which
> is located in a constructor function. There is no guarantee for
> constructor function ordering so thread_init() may only be called later.
>
> Reported-by: Mario de Chenno <address@hidden>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
> trace/simple.c | 9 ---------
> util/osdep.c | 18 ++++++++++++++++++
> vl.c | 8 --------
> 3 files changed, 18 insertions(+), 17 deletions(-)
Applied to my block tree, we need this for QEMU 2.0:
https://github.com/stefanha/qemu/commits/block
Stefan
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