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	WaitPort -- wait for a given port to be non-empty

	message = WaitPort(port)
	D0		   A0

	struct Message *WaitPort(struct MsgPort *);

	This function waits for the given port to become non-empty.  If
	necessary, the Wait() function will be called to wait for the port
	signal.  If a message is already present at the port, this function
	will return immediately.  The return value is always a pointer to
	the first message queued (but it is not removed from the queue).

	More than one message may be at the port when this returns.  It is
	proper to call the GetMsg() function in a loop until all messages
	have been handled, then wait for more to arrive.

	To wait for more than one port, combine the signal bits from each
	port into one call to the Wait() function, then use a GetMsg() loop
	to collect any and all messages.  It is possible to get a signal
	for a port WITHOUT a message showing up.  Plan for this.

	port - a pointer to the message port

	message - a pointer to the first available message


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