/* file:    mycthreads.h */
/* author:  MLehr */

/*
 *                     Copyright (C) 1994
 *           by the Rector and Board of Visitors of
 *                 the University of Virginia
 *
 *                   for more information:
 *                        Sanghyuk Son
 *               Department of Computer Science
 *         School of Engineering and Applied Science
 *                   University of Virginia
 *                 Charlottesville, VA  22903
 */


#ifndef	MYCTHREADS_H_
#define	MYCTHREADS_H_	1

/* We need to be able to use lightweight locks, but the C-thread
   headers in mach3/src/mk/user/threads/ produce many compile-time
   errors, so we put together our own.  */

typedef volatile int spin_lock_t;

#define spin_lock_init(s)	(*(s) = 0)
#define spin_lock(p)		if (!spin_try_lock (p)) spin_lock_solid (p);

/* If you use these functions, link with the C-threads library,
   libthreads.a. */

void spin_lock_solid (spin_lock_t *);
void spin_unlock (spin_lock_t *);
int spin_try_lock (spin_lock_t *);

#endif	/* MYCTHREADS_H_ */