1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 5 * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Chris Provenzano. 19 * 4. The name of Chris Provenzano may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY 27 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 30 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD$ 36 * 37 * Description : Basic timers header. 38 */ 39 40 #ifndef _SYS_TIMERS_H_ 41 #define _SYS_TIMERS_H_ 42 43 #include <sys/time.h> 44 45 #ifdef _KERNEL 46 /* 47 * Structures used to manage POSIX timers in a process. 48 */ 49 struct itimer { 50 struct mtx it_mtx; 51 struct sigevent it_sigev; 52 struct itimerspec it_time; 53 struct proc *it_proc; 54 int it_flags; 55 int it_usecount; 56 int it_overrun; /* Overruns currently accumulating */ 57 int it_overrun_last; /* Overruns associated w/ a delivery */ 58 int it_clockid; 59 int it_timerid; 60 ksiginfo_t it_ksi; 61 union { 62 /* realtime */ 63 struct { 64 struct callout it_callout; 65 } _rt; 66 67 /* cpu timer */ 68 struct { 69 LIST_ENTRY(itimer) it_link; 70 TAILQ_ENTRY(itimer) it_worklink; 71 int it_active; 72 int it_cflags; 73 } _cpu; 74 } _data; 75 }; 76 77 #define it_callout _data._rt.it_callout 78 #define it_link _data._cpu.it_link 79 #define it_active _data._cpu.it_active 80 #define it_worklink _data._cpu.it_worklink 81 #define it_cflags _data._cpu.it_cflags 82 83 #define ITF_DELETING 0x01 84 #define ITF_WANTED 0x02 85 #define ITF_PSTOPPED 0x04 86 87 #define ITCF_ONWORKLIST 0x01 88 89 #define TIMER_MAX 32 90 91 #define ITIMER_LOCK(it) mtx_lock(&(it)->it_mtx) 92 #define ITIMER_UNLOCK(it) mtx_unlock(&(it)->it_mtx) 93 94 LIST_HEAD(itimerlist, itimer); 95 96 struct itimers { 97 struct itimerlist its_virtual; 98 struct itimerlist its_prof; 99 TAILQ_HEAD(, itimer) its_worklist; 100 struct itimer *its_timers[TIMER_MAX]; 101 }; 102 103 struct kclock { 104 int (*timer_create)(struct itimer *timer); 105 int (*timer_settime)(struct itimer * timer, int flags, 106 struct itimerspec * new_value, 107 struct itimerspec * old_value); 108 int (*timer_delete)(struct itimer * timer); 109 int (*timer_gettime)(struct itimer * timer, 110 struct itimerspec * cur_value); 111 }; 112 113 void itimers_exec(struct proc *p); 114 void itimers_exit(struct proc *p); 115 int itimer_accept(struct proc *p, int tid, ksiginfo_t *ksi); 116 #endif 117 #endif /* !_SYS_TIMERS_H_ */ 118