FreeBSD/Linux Kernel Cross Reference
sys/sys/sched.h
1 /*-
2 * Copyright (c) 1996, 1997
3 * HD Associates, Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by HD Associates, Inc
16 * and Jukka Antero Ukkonen.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``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 HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER 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
34 /*-
35 * Copyright (c) 2002-2008, Jeffrey Roberson <jeff@freebsd.org>
36 * All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice unmodified, this list of conditions, and the following
43 * disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
49 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
50 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
51 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
52 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
53 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
54 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
55 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
56 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
57 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
58 *
59 * $FreeBSD: releng/9.1/sys/sys/sched.h 233814 2012-04-02 20:34:15Z jhb $
60 */
61
62 #ifndef _SCHED_H_
63 #define _SCHED_H_
64
65 #ifdef _KERNEL
66 /*
67 * General scheduling info.
68 *
69 * sched_load:
70 * Total runnable non-ithread threads in the system.
71 *
72 * sched_runnable:
73 * Runnable threads for this processor.
74 */
75 int sched_load(void);
76 int sched_rr_interval(void);
77 int sched_runnable(void);
78
79 /*
80 * Proc related scheduling hooks.
81 */
82 void sched_exit(struct proc *p, struct thread *childtd);
83 void sched_fork(struct thread *td, struct thread *childtd);
84 void sched_fork_exit(struct thread *td);
85 void sched_class(struct thread *td, int class);
86 void sched_nice(struct proc *p, int nice);
87
88 /*
89 * Threads are switched in and out, block on resources, have temporary
90 * priorities inherited from their procs, and use up cpu time.
91 */
92 void sched_exit_thread(struct thread *td, struct thread *child);
93 void sched_fork_thread(struct thread *td, struct thread *child);
94 void sched_lend_prio(struct thread *td, u_char prio);
95 void sched_lend_user_prio(struct thread *td, u_char pri);
96 fixpt_t sched_pctcpu(struct thread *td);
97 void sched_prio(struct thread *td, u_char prio);
98 void sched_sleep(struct thread *td, int prio);
99 void sched_switch(struct thread *td, struct thread *newtd, int flags);
100 void sched_throw(struct thread *td);
101 void sched_unlend_prio(struct thread *td, u_char prio);
102 void sched_user_prio(struct thread *td, u_char prio);
103 void sched_userret(struct thread *td);
104 void sched_wakeup(struct thread *td);
105 void sched_preempt(struct thread *td);
106
107 /*
108 * Threads are moved on and off of run queues
109 */
110 void sched_add(struct thread *td, int flags);
111 void sched_clock(struct thread *td);
112 void sched_rem(struct thread *td);
113 void sched_tick(int cnt);
114 void sched_relinquish(struct thread *td);
115 struct thread *sched_choose(void);
116 void sched_idletd(void *);
117
118 /*
119 * Binding makes cpu affinity permanent while pinning is used to temporarily
120 * hold a thread on a particular CPU.
121 */
122 void sched_bind(struct thread *td, int cpu);
123 static __inline void sched_pin(void);
124 void sched_unbind(struct thread *td);
125 static __inline void sched_unpin(void);
126 int sched_is_bound(struct thread *td);
127 void sched_affinity(struct thread *td);
128
129 /*
130 * These procedures tell the process data structure allocation code how
131 * many bytes to actually allocate.
132 */
133 int sched_sizeof_proc(void);
134 int sched_sizeof_thread(void);
135
136 /*
137 * This routine provides a consistent thread name for use with KTR graphing
138 * functions.
139 */
140 char *sched_tdname(struct thread *td);
141 #ifdef KTR
142 void sched_clear_tdname(struct thread *td);
143 #endif
144
145 static __inline void
146 sched_pin(void)
147 {
148 curthread->td_pinned++;
149 }
150
151 static __inline void
152 sched_unpin(void)
153 {
154 curthread->td_pinned--;
155 }
156
157 /* sched_add arguments (formerly setrunqueue) */
158 #define SRQ_BORING 0x0000 /* No special circumstances. */
159 #define SRQ_YIELDING 0x0001 /* We are yielding (from mi_switch). */
160 #define SRQ_OURSELF 0x0002 /* It is ourself (from mi_switch). */
161 #define SRQ_INTR 0x0004 /* It is probably urgent. */
162 #define SRQ_PREEMPTED 0x0008 /* has been preempted.. be kind */
163 #define SRQ_BORROWING 0x0010 /* Priority updated due to prio_lend */
164
165 /* Scheduler stats. */
166 #ifdef SCHED_STATS
167 DPCPU_DECLARE(long, sched_switch_stats[SWT_COUNT]);
168
169 #define SCHED_STAT_DEFINE_VAR(name, ptr, descr) \
170 static void name ## _add_proc(void *dummy __unused) \
171 { \
172 \
173 SYSCTL_ADD_PROC(NULL, \
174 SYSCTL_STATIC_CHILDREN(_kern_sched_stats), OID_AUTO, \
175 #name, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE, \
176 ptr, 0, sysctl_dpcpu_long, "LU", descr); \
177 } \
178 SYSINIT(name, SI_SUB_RUN_SCHEDULER, SI_ORDER_MIDDLE, name ## _add_proc, NULL);
179
180 #define SCHED_STAT_DEFINE(name, descr) \
181 DPCPU_DEFINE(unsigned long, name); \
182 SCHED_STAT_DEFINE_VAR(name, &DPCPU_NAME(name), descr)
183 /*
184 * Sched stats are always incremented in critical sections so no atomic
185 * is necesssary to increment them.
186 */
187 #define SCHED_STAT_INC(var) DPCPU_GET(var)++;
188 #else
189 #define SCHED_STAT_DEFINE_VAR(name, descr, ptr)
190 #define SCHED_STAT_DEFINE(name, descr)
191 #define SCHED_STAT_INC(var) (void)0
192 #endif
193
194 /*
195 * Fixup scheduler state for proc0 and thread0
196 */
197 void schedinit(void);
198 #endif /* _KERNEL */
199
200 /* POSIX 1003.1b Process Scheduling */
201
202 /*
203 * POSIX scheduling policies
204 */
205 #define SCHED_FIFO 1
206 #define SCHED_OTHER 2
207 #define SCHED_RR 3
208
209 struct sched_param {
210 int sched_priority;
211 };
212
213 /*
214 * POSIX scheduling declarations for userland.
215 */
216 #ifndef _KERNEL
217 #include <sys/cdefs.h>
218 #include <sys/_types.h>
219
220 #ifndef _PID_T_DECLARED
221 typedef __pid_t pid_t;
222 #define _PID_T_DECLARED
223 #endif
224
225 struct timespec;
226
227 __BEGIN_DECLS
228 int sched_get_priority_max(int);
229 int sched_get_priority_min(int);
230 int sched_getparam(pid_t, struct sched_param *);
231 int sched_getscheduler(pid_t);
232 int sched_rr_get_interval(pid_t, struct timespec *);
233 int sched_setparam(pid_t, const struct sched_param *);
234 int sched_setscheduler(pid_t, int, const struct sched_param *);
235 int sched_yield(void);
236 __END_DECLS
237
238 #endif
239 #endif /* !_SCHED_H_ */
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