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Annotation of OSKit-Mach/kern/time_out.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989,1988,1987 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: #ifndef        _KERN_TIME_OUT_H_
        !            28: #define        _KERN_TIME_OUT_H_
        !            29: 
        !            30: /*
        !            31:  * Mach time-out and time-of-day facility.
        !            32:  */
        !            33: 
        !            34: #include <mach/boolean.h>
        !            35: #include <mach/time_value.h>
        !            36: #include <kern/lock.h>
        !            37: #include <kern/queue.h>
        !            38: #include <kern/zalloc.h>
        !            39: 
        !            40: /*
        !            41:  *     Timers in kernel:
        !            42:  */
        !            43: extern unsigned long elapsed_ticks; /* number of ticks elapsed since bootup */
        !            44: extern int     hz;             /* number of ticks per second */
        !            45: extern int     tick;           /* number of usec per tick */
        !            46: 
        !            47: /* Read the current time into STAMP */
        !            48: void record_time_stamp (time_value_t *stamp);
        !            49: 
        !            50: /*
        !            51:  *     Time-out element.
        !            52:  */
        !            53: struct timer_elt {
        !            54:        queue_chain_t   chain;          /* chain in order of expiration */
        !            55:        int             (*fcn)();       /* function to call */
        !            56:        char *          param;          /* with this parameter */
        !            57:        unsigned long   ticks;          /* expiration time, in ticks */
        !            58:        int             set;            /* unset | set | allocated */
        !            59: };
        !            60: #define        TELT_UNSET      0               /* timer not set */
        !            61: #define        TELT_SET        1               /* timer set */
        !            62: #define        TELT_ALLOC      2               /* timer allocated from pool */
        !            63: 
        !            64: typedef        struct timer_elt        timer_elt_data_t;
        !            65: typedef        struct timer_elt        *timer_elt_t;
        !            66: 
        !            67: /* for 'private' timer elements */
        !            68: extern void            set_timeout();
        !            69: extern boolean_t       reset_timeout();
        !            70: 
        !            71: /* for public timer elements */
        !            72: extern void            timeout();
        !            73: extern boolean_t       untimeout();
        !            74: 
        !            75: #define        set_timeout_setup(telt,fcn,param,interval)      \
        !            76:        ((telt)->fcn = (fcn),                           \
        !            77:         (telt)->param = (param),                       \
        !            78:         (telt)->private = TRUE,                        \
        !            79:         set_timeout((telt), (interval)))
        !            80: 
        !            81: #define        reset_timeout_check(t) \
        !            82:        MACRO_BEGIN \
        !            83:        if ((t)->set) \
        !            84:            reset_timeout((t)); \
        !            85:        MACRO_END
        !            86: 
        !            87: #endif /* _KERN_TIME_OUT_H_ */

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