//rcxsem.nqh
//A collection of macros implementing semaphores 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

//semaphores version
#define SEMVER 2

//notational convenience
#define sem int

//set/clear values

#define SSET 1			//semaphore is set
#define SCLEAR 0		//semaphore is clear

//semaphore operations

//sem_clear -- sets a semaphore to 0
#define sem_clear(s) 	s = 0;

//sem_acquire -- waits for a semaphore to clear, then takes control
#define sem_acquire(s) 	until (s == 0); s = 1;

//sem_release -- clears a semaphore and relinquishes control
#define sem_release(s)  s = 0;

//Yes, technically it's identical to sem_clear, but you don't need 
//to know that.