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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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