Re: [Qemu-devel] Problem under OSX Lion: GThread-ERROR **: GThread system may only be initialized once

["Daniel P. Berrange" <berrange@redhat.com>]

On Mon, Oct 31, 2011 at 09:25:26AM -0700, Juan Pineda wrote:
> The current Qemu master branch crashes under OSX with a GThread error.
> Commenting out vlc.c line 2188 (call to g_thread_init) allows it to run
> successfully.

As a general rule all calls to 'g_thread_init(NULL)' should be protected
by a conditional thus:

        if (!g_thread_supported())
            g_thread_init(NULL);

Even though QEMU calls g_thread_init() very early in main(), there is
always the possibility that some library QEMU links to, has got an ELF
initializer, triggering before main(), which calls g_thread_init().

NB on GLib versions >= 2.24, g_thread_init() is a no-op if called more
than once[1], but for sake of compatibility QEMU ought to use the conditonal
check.

Regards,
Daniel

[1] The reason for this change is that GObject itself actually calls
    g_thread_init() secretly too.
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