//rcxmsg.nqh
//A collection of macros implementing intertask messaging for NQC
//
//This file is part of the NQCIPC package and should not be 
//distributed separately. See
//	http://www.geocities.com/ResearchTriangle/Station/2266/nqcipc/nqcipcdoc.html
//
//for details.
//
//(c)1999 Brian Connors under terms of the MPL
//contact: connorbd@yahoo.com

//messages version

#define MSGVER 2

//notational convenience

#define msg int

//message operations

//msg_clear -- clears a specified message buffer b
#define msg_clear(b) 	b = 0;

//msg_send -- places a value m in a specified message buffer b
#define msg_send(b,m)	b = m;

//msg_await -- watches message buffer b, then blocks until 
//	an expected value m appears
#define msg_await(b,m) 	until (b == m);

//msg_read -- takes the contents of message buffer b and copies 
//	to specified variable v

#define msg_read(b,v)	v = b;

//msg_biff -- is there a message in the first place?

#define msg_biff(b)		b > 0