1/*-
2 * See the file LICENSE for redistribution information.
3 *
4 * Copyright (c) 1997, 1998
5 *	Sleepycat Software.  All rights reserved.
6 */
7
8#include "config.h"
9
10#ifndef lint
11static const char sccsid[] = "@(#)os_sleep.c	10.12 (Sleepycat) 10/12/98";
12#endif /* not lint */
13
14#ifndef NO_SYSTEM_INCLUDES
15#include <sys/types.h>
16#ifdef HAVE_SYS_TIME_H
17#include <sys/time.h>
18#endif
19#ifdef HAVE_SYS_SELECT_H
20#include <sys/select.h>
21#endif
22
23#include <errno.h>
24#ifndef HAVE_SYS_TIME_H
25#include <time.h>
26#endif
27#include <unistd.h>
28#endif
29
30#include "db_int.h"
31#include "os_jump.h"
32
33/*
34 * __os_sleep --
35 *	Yield the processor for a period of time.
36 *
37 * PUBLIC: int __os_sleep __P((u_long, u_long));
38 */
39int
40__os_sleep(secs, usecs)
41	u_long secs, usecs;		/* Seconds and microseconds. */
42{
43	struct timeval t;
44
45	/* Don't require that the values be normalized. */
46	for (; usecs >= 1000000; ++secs, usecs -= 1000000)
47		;
48
49	if (__db_jump.j_sleep != NULL)
50		return (__db_jump.j_sleep(secs, usecs));
51
52	/*
53	 * It's important that we yield the processor here so that other
54	 * processes or threads are permitted to run.
55	 */
56	t.tv_sec = secs;
57	t.tv_usec = usecs;
58	return (select(0, NULL, NULL, NULL, &t) == -1 ? errno : 0);
59}
60