FreeBSD/Linux Kernel Cross Reference
sys/kern/quantum.h
1 /*
2 * Mach Operating System
3 * Copyright (c) 1993 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26 /*
27 * HISTORY
28 * $Log: quantum.h,v $
29 * Revision 2.2 93/11/17 17:19:18 dbg
30 * Created.
31 * [93/05/11 dbg]
32 *
33 */
34
35 #ifndef _KERN_QUANTUM_H_
36 #define _KERN_QUANTUM_H_
37
38 #include <kern/kern_types.h>
39
40 /*
41 * Routines to perform quantum adjustment.
42 */
43 extern int min_quantum; /* maximum context switch rate,
44 in microseconds */
45
46 /*
47 * Precalculate the quanta for a processor set.
48 */
49 extern void quantum_set(
50 processor_set_t pset);
51
52 /*
53 * Recalculate quantum (and thread priority) at
54 * each clock tick.
55 */
56 void clock_quantum_update(
57 thread_t thread,
58 int mycpu,
59 unsigned int usecs);
60
61 #endif /* _KERN_QUANTUM_H_ */
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