qemu-thread: introduce QemuRecMutex
GRecMutex is new in glib 2.32, so we cannot use it. Introduce a recursive mutex in qemu-thread instead, which will be used instead of RFifoLock. Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <1477565348-5458-20-git-send-email-pbonzini@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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