1 /*- 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3 * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Chris Provenzano. 17 * 4. The name of Chris Provenzano may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 * 35 * Description : Basic timers header. 36 */ 37 38 #ifndef _SYS_TIMERS_H_ 39 #define _SYS_TIMERS_H_ 40 41 #include <sys/time.h> 42 43 #ifdef _KERNEL 44 /* 45 * Structures used to manage POSIX timers in a process. 46 */ 47 struct itimer { 48 struct mtx it_mtx; 49 struct sigevent it_sigev; 50 struct itimerspec it_time; 51 struct proc *it_proc; 52 int it_flags; 53 int it_usecount; 54 int it_overrun; /* Overruns currently accumulating */ 55 int it_overrun_last; /* Overruns associated w/ a delivery */ 56 int it_clockid; 57 int it_timerid; 58 ksiginfo_t it_ksi; 59 union { 60 /* realtime */ 61 struct { 62 struct callout it_callout; 63 } _rt; 64 65 /* cpu timer */ 66 struct { 67 LIST_ENTRY(itimer) it_link; 68 TAILQ_ENTRY(itimer) it_worklink; 69 int it_active; 70 int it_cflags; 71 } _cpu; 72 } _data; 73 }; 74 75 #define it_callout _data._rt.it_callout 76 #define it_link _data._cpu.it_link 77 #define it_active _data._cpu.it_active 78 #define it_worklink _data._cpu.it_worklink 79 #define it_cflags _data._cpu.it_cflags 80 81 #define ITF_DELETING 0x01 82 #define ITF_WANTED 0x02 83 84 #define ITCF_ONWORKLIST 0x01 85 86 #define TIMER_MAX 32 87 88 #define ITIMER_LOCK(it) mtx_lock(&(it)->it_mtx) 89 #define ITIMER_UNLOCK(it) mtx_unlock(&(it)->it_mtx) 90 91 LIST_HEAD(itimerlist, itimer); 92 93 struct itimers { 94 struct itimerlist its_virtual; 95 struct itimerlist its_prof; 96 TAILQ_HEAD(, itimer) its_worklist; 97 struct itimer *its_timers[TIMER_MAX]; 98 }; 99 100 struct kclock { 101 int (*timer_create)(struct itimer *timer); 102 int (*timer_settime)(struct itimer * timer, int flags, 103 struct itimerspec * new_value, 104 struct itimerspec * old_value); 105 int (*timer_delete)(struct itimer * timer); 106 int (*timer_gettime)(struct itimer * timer, 107 struct itimerspec * cur_value); 108 void (*event_hook)(struct proc *p, clockid_t clock_id, int event); 109 }; 110 111 /* Event values for event_hook() */ 112 #define ITIMER_EV_EXEC 0 113 #define ITIMER_EV_EXIT 1 114 115 int itimer_accept(struct proc *p, int tid, ksiginfo_t *ksi); 116 #endif 117 #endif /* !_SYS_TIMERS_H_ */ 118