From f07a4c844da9f0ecae5bbee1ab94be56505f26f7 Mon Sep 17 00:00:00 2001 From: Thomas Bushnell Date: Tue, 25 Feb 1997 21:28:37 +0000 Subject: Initial source --- kern/eventcount.h | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 kern/eventcount.h (limited to 'kern/eventcount.h') diff --git a/kern/eventcount.h b/kern/eventcount.h new file mode 100644 index 0000000..e2001de --- /dev/null +++ b/kern/eventcount.h @@ -0,0 +1,57 @@ +/* + * 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); + +#endif /* _KERN_EVENTCOUNT_H_ */ -- cgit v1.2.3