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

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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