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2072 |
malin |
/*
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* tclUnixEvent.c --
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*
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* This file implements Unix specific event related routines.
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*
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* Copyright (c) 1997 by Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tclUnixEvent.c,v 1.4 2001/11/21 02:36:21 hobbs Exp $
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*/
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#include "tclInt.h"
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#include "tclPort.h"
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_Sleep --
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*
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* Delay execution for the specified number of milliseconds.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Time passes.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_Sleep(ms)
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int ms; /* Number of milliseconds to sleep. */
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{
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struct timeval delay;
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Tcl_Time before, after;
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/*
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* The only trick here is that select appears to return early
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* under some conditions, so we have to check to make sure that
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* the right amount of time really has elapsed. If it's too
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* early, go back to sleep again.
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*/
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Tcl_GetTime(&before);
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after = before;
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after.sec += ms/1000;
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after.usec += (ms%1000)*1000;
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if (after.usec > 1000000) {
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after.usec -= 1000000;
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after.sec += 1;
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}
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while (1) {
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delay.tv_sec = after.sec - before.sec;
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delay.tv_usec = after.usec - before.usec;
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if (delay.tv_usec < 0) {
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delay.tv_usec += 1000000;
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delay.tv_sec -= 1;
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}
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/*
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* Special note: must convert delay.tv_sec to int before comparing
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* to zero, since delay.tv_usec is unsigned on some platforms.
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*/
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if ((((int) delay.tv_sec) < 0)
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|| ((delay.tv_usec == 0) && (delay.tv_sec == 0))) {
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break;
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}
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(void) select(0, (SELECT_MASK *) 0, (SELECT_MASK *) 0,
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(SELECT_MASK *) 0, &delay);
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Tcl_GetTime(&before);
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}
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}
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