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
11 static 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 */
39 int
__os_sleep(secs,usecs)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