os_sleep.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997, 1998, 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: os__sleep_8c-source.html,v 1.1 2008/06/08 10:21:31 sebdiaz Exp $";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#ifdef HAVE_VXWORKS
#include <sys/times.h>
#include <time.h>
#else
#if TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif /* HAVE_SYS_TIME_H */
#endif /* TIME_WITH SYS_TIME */
#endif /* HAVE_VXWORKS */

#include <string.h>
#include <unistd.h>
#endif

#include "db_int.h"
#include "os_jump.h"

/*
 * CDB___os_sleep --
 *      Yield the processor for a period of time.
 *
 * PUBLIC: int CDB___os_sleep __P((DB_ENV *, u_long, u_long));
 */
int
CDB___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 >= 1000000; usecs -= 1000000)
                ++secs;

        if (CDB___db_jump.j_sleep != NULL)
                return (CDB___db_jump.j_sleep(secs, usecs));

        /*
         * It's important that we yield the processor here so that other
         * processes or threads are permitted to run.
         */
        t.tv_sec = secs;
        t.tv_usec = usecs;
        ret =  select(0, NULL, NULL, NULL, &t) == -1 ? CDB___os_get_errno() : 0;

        if (ret != 0)
                CDB___db_err(dbenv, "select: %s", strerror(ret));

        return (ret);
}

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