Rebind debug prints.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>
xio: added missing calls to DispatchStrategy

Signed-off-by: Casey Bodley <casey@linuxbox.com>
Signed-off-by: Matt Benjamin <matt@linuxbox.com>
msg: implement QueueStrategy::wait()

Signed-off-by: Casey Bodley <casey@linuxbox.com>
Signed-off-by: Matt Benjamin <matt@linuxbox.com>
msg: bug fix for QueueStrategy shutdown

QueueStrategy::entry() was never terminating, because the message
pointer 'm' wasn't being NULLed on an empty queue.

Signed-off-by: Casey Bodley <casey@linuxbox.com>
Signed-off-by: Matt Benjamin <matt@linuxbox.com>