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Annotation of OSKit-Mach/kern/eventcount.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1993-1987 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  * 
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  * 
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  * 
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  * 
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  * 
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     File:   eventcount.c
                     28:  *     Author: Alessandro Forin
                     29:  *     Date:   10/91
                     30:  *
                     31:  *     Eventcounters, for user-level drivers synchronization
                     32:  *
                     33:  */
                     34: 
                     35: #ifndef        _KERN_EVENTCOUNT_H_
                     36: #define        _KERN_EVENTCOUNT_H_     1
                     37: 
                     38: /* kernel visible only */
                     39: 
                     40: typedef struct evc {
                     41:        int             count;
                     42:        thread_t        waiting_thread;
                     43:        natural_t       ev_id;
                     44:        struct evc      *sanity;
                     45:        decl_simple_lock_data(, lock)
                     46: } *evc_t;
                     47: 
                     48: extern void    evc_init(evc_t ev),
                     49:                evc_destroy(evc_t ev),
                     50:                evc_signal(evc_t ev),
                     51:                evc_notify_abort(thread_t thread);
                     52: 
                     53: /* kernel and user visible */
                     54: 
                     55: extern kern_return_t   evc_wait(natural_t ev_id);
                     56: 
                     57: #endif /* _KERN_EVENTCOUNT_H_ */

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