FreeBSD/Linux Kernel Cross Reference
sys/sys/timers.h
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: releng/8.3/sys/sys/timers.h 199583 2009-11-20 15:27:52Z jhb $
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_ */
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