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Annotation of kernel/kern/time_out.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
                     28:  * All Rights Reserved.
                     29:  * 
                     30:  * Permission to use, copy, modify and distribute this software and its
                     31:  * documentation is hereby granted, provided that both the copyright
                     32:  * notice and this permission notice appear in all copies of the
                     33:  * software, derivative works or modified versions, and any portions
                     34:  * thereof, and that both notices appear in supporting documentation.
                     35:  * 
                     36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     39:  * 
                     40:  * Carnegie Mellon requests users of this software to return to
                     41:  * 
                     42:  *  Software Distribution Coordinator  or  [email protected]
                     43:  *  School of Computer Science
                     44:  *  Carnegie Mellon University
                     45:  *  Pittsburgh PA 15213-3890
                     46:  * 
                     47:  * any improvements or extensions that they make and grant Carnegie Mellon
                     48:  * the rights to redistribute these changes.
                     49:  */
                     50: 
                     51: #ifndef        _KERN_TIME_OUT_H_
                     52: #define        _KERN_TIME_OUT_H_
                     53: 
                     54: /*
                     55:  * Mach time-out and time-of-day facility.
                     56:  */
                     57: 
                     58: /*
                     59:  *     Timers in kernel:
                     60:  */
                     61: extern int     hz;             /* number of ticks per second */
                     62: extern int     tick;           /* number of usec per tick */
                     63: 
                     64: #import <kern/thread_call.h>
                     65: #import <kern/thread_call_private.h>
                     66: 
                     67: /*
                     68:  *     Time-out element.
                     69:  */
                     70: struct timer_elt {
                     71:        struct _thread_call
                     72:                        call;
                     73:        int             (*fcn)();       /* function to call */
                     74:        char *          param;          /* with this parameter */
                     75:        unsigned long   ticks;          /* expiration time, in ticks */
                     76:        int             set;            /* unset | set | allocated */
                     77: };
                     78: #define        TELT_UNSET      0               /* timer not set */
                     79: #define        TELT_SET        1               /* timer set */
                     80: #define        TELT_ALLOC      2               /* timer allocated from pool */
                     81: 
                     82: typedef        struct timer_elt        timer_elt_data_t;
                     83: typedef        struct timer_elt        *timer_elt_t;
                     84: 
                     85: /* for 'private' timer elements */
                     86: extern void            set_timeout();
                     87: extern boolean_t       reset_timeout();
                     88: 
                     89: #define        set_timeout_setup(telt,fcn,param,interval)      \
                     90:        ((telt)->fcn = (fcn),                           \
                     91:         (telt)->param = (param),                       \
                     92:         (telt)->private = TRUE,                        \
                     93:         set_timeout((telt), (interval)))
                     94: 
                     95: #define        reset_timeout_check(t) \
                     96:        MACRO_BEGIN \
                     97:        if ((t)->set) \
                     98:            reset_timeout((t)); \
                     99:        MACRO_END
                    100: 
                    101: #endif /* _KERN_TIME_OUT_H_ */

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