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/*
* Mach Operating System
* Copyright (c) 1993-1987 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: eventcount.c
* Author: Alessandro Forin
* Date: 10/91
*
* Eventcounters, for user-level drivers synchronization
*
*/
#ifndef _KERN_EVENTCOUNT_H_
#define _KERN_EVENTCOUNT_H_ 1
/* kernel visible only */
typedef struct evc {
int count;
thread_t waiting_thread;
natural_t ev_id;
struct evc *sanity;
decl_simple_lock_data(, lock)
} *evc_t;
extern void evc_init(evc_t ev),
evc_destroy(evc_t ev),
evc_signal(evc_t ev),
evc_notify_abort(thread_t thread);
/* kernel and user visible */
extern kern_return_t evc_wait(natural_t ev_id);
extern kern_return_t evc_wait_clear(natural_t ev_id);
#if NCPUS <= 1
void simpler_thread_setrun(
thread_t th,
boolean_t may_preempt);
#endif
#endif /* _KERN_EVENTCOUNT_H_ */
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