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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997,2007 Oracle. All rights reserved.
*
* $Id: os_sleep.c,v 12.14 2007/05/17 15:15:46 bostic Exp $
*/
#include "db_config.h"
#define __INCLUDE_SELECT_H 1
#include "db_int.h"
/*
* __os_sleep --
* Yield the processor for a period of time.
*
* PUBLIC: void __os_sleep __P((DB_ENV *, u_long, u_long));
*/
void
__os_sleep(dbenv, secs, usecs)
DB_ENV *dbenv;
u_long secs, usecs; /* Seconds and microseconds. */
{
struct timeval t;
int ret;
/* Don't require that the values be normalized. */
for (; usecs >= US_PER_SEC; usecs -= US_PER_SEC)
++secs;
if (DB_GLOBAL(j_sleep) != NULL) {
(void)DB_GLOBAL(j_sleep)(secs, usecs);
return;
}
/*
* It's important we yield the processor here so other processes or
* threads can run.
*
* XXX
* VxWorks doesn't yield the processor on select. This isn't really
* an infinite loop, even though __os_yield can call __os_sleep, and
* we'll fix this when the tree isn't frozen. [#15037]
*/
#ifdef HAVE_VXWORKS
__os_yield(dbenv);
#endif
/*
* Sheer raving paranoia -- don't select for 0 time, in case some
* implementation doesn't yield the processor in that case.
*/
t.tv_sec = (long)secs;
if (secs == 0 && usecs == 0)
t.tv_usec = 1;
else
t.tv_usec = (long)usecs;
/*
* We don't catch interrupts and restart the system call here, unlike
* other Berkeley DB system calls. This may be a user attempting to
* interrupt a sleeping DB utility (for example, db_checkpoint), and
* we want the utility to see the signal and quit. This assumes it's
* always OK for DB to sleep for less time than originally scheduled.
*/
if (select(0, NULL, NULL, NULL, &t) == -1) {
ret = __os_get_syserr();
if (__os_posix_err(ret) != EINTR)
__db_syserr(dbenv, ret, "select");
}
}
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