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Annotation of Gnu-Mach/kern/mach_clock.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (C) 2006, 2007 Free Software Foundation, Inc.
                      3:  *
                      4:  * This program is free software; you can redistribute it and/or modify
                      5:  * it under the terms of the GNU General Public License as published by
                      6:  * the Free Software Foundation; either version 2, or (at your option)
                      7:  * any later version.
                      8:  *
                      9:  * This program is distributed in the hope that it will be useful,
                     10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     12:  * GNU General Public License for more details.
                     13:  *
                     14:  * You should have received a copy of the GNU General Public License
                     15:  * along with this program; if not, write to the Free Software
                     16:  * Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
                     17:  *
                     18:  * Author: Barry deFreese and others.
                     19:  */
                     20: 
                     21: #ifndef _KERN_MACH_CLOCK_H_
                     22: #define _KERN_MACH_CLOCK_H_
                     23: 
                     24: /*
                     25:  * Mach time-out and time-of-day facility.
                     26:  */
                     27: 
                     28: #include <mach/machine/kern_return.h>
                     29: #include <mach/time_value.h>
                     30: #include <kern/host.h>
                     31: #include <kern/queue.h>
                     32: 
                     33: 
                     34: /* Timers in kernel.  */
                     35: extern unsigned long   elapsed_ticks;  /* number of ticks elapsed since bootup */
                     36: extern int             hz;             /* number of ticks per second */
                     37: extern int             tick;           /* number of usec per tick */
                     38: 
                     39: 
                     40: typedef void timer_func_t(void *);
                     41: 
                     42: /* Time-out element.  */
                     43: struct timer_elt {
                     44:        queue_chain_t   chain;          /* chain in order of expiration */
                     45:        timer_func_t    *fcn;           /* function to call */
                     46:        void *          param;          /* with this parameter */
                     47:        unsigned long   ticks;          /* expiration time, in ticks */
                     48:        int             set;            /* unset | set | allocated */
                     49: };
                     50: #define        TELT_UNSET      0               /* timer not set */
                     51: #define        TELT_SET        1               /* timer set */
                     52: #define        TELT_ALLOC      2               /* timer allocated from pool */
                     53: 
                     54: typedef        struct timer_elt        timer_elt_data_t;
                     55: typedef        struct timer_elt        *timer_elt_t;
                     56: 
                     57: 
                     58: extern void clock_interrupt(
                     59:    int usec,
                     60:    boolean_t usermode,
                     61:    boolean_t basepri);
                     62: 
                     63: extern void softclock (void);
                     64: 
                     65: /* For `private' timer elements.  */
                     66: extern void set_timeout(
                     67:    timer_elt_t telt,
                     68:    unsigned int interval);
                     69: extern boolean_t reset_timeout(timer_elt_t telt);
                     70: 
                     71: #define        set_timeout_setup(telt,fcn,param,interval)      \
                     72:        ((telt)->fcn = (fcn),                           \
                     73:         (telt)->param = (param),                       \
                     74:         (telt)->private = TRUE,                        \
                     75:        set_timeout((telt), (interval)))
                     76: 
                     77: #define        reset_timeout_check(t)                          \
                     78:        MACRO_BEGIN                                     \
                     79:        if ((t)->set)                                   \
                     80:            reset_timeout((t));                         \
                     81:        MACRO_END
                     82: 
                     83: extern void init_timeout (void);
                     84: 
                     85: /* Read the current time into STAMP.  */
                     86: extern void record_time_stamp (time_value_t *stamp);
                     87: 
                     88: extern kern_return_t host_get_time(
                     89:    host_t host,
                     90:    time_value_t *current_time);
                     91: 
                     92: extern kern_return_t host_set_time(
                     93:    host_t host,
                     94:    time_value_t new_time);
                     95: 
                     96: extern kern_return_t host_adjust_time(
                     97:    host_t host,
                     98:    time_value_t new_adjustment,
                     99:    time_value_t *old_adjustment);
                    100: 
                    101: extern void mapable_time_init (void);
                    102: 
                    103: /* For public timer elements.  */
                    104: extern void timeout(timer_func_t *fcn, void *param, int interval);
                    105: extern boolean_t untimeout(timer_func_t *fcn, void *param);
                    106: 
                    107: #endif /* _KERN_MACH_CLOCK_H_ */

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