96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/*
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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 of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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#include "tclInt.h"
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#ifndef HAVE_COREFOUNDATION /* Darwin/Mac OS X CoreFoundation notifier is
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* in tclMacOSXNotify.c */
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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(
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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, vdelay;
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/*
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* The only trick here is that select appears to return early under some
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* conditions, so we have to check to make sure that the right amount of
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* time really has elapsed. If it's too 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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/*
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* TIP #233: Scale from virtual time to real-time for select.
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*/
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vdelay.sec = after.sec - before.sec;
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vdelay.usec = after.usec - before.usec;
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if (vdelay.usec < 0) {
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vdelay.usec += 1000000;
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vdelay.sec -= 1;
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}
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if ((vdelay.sec != 0) || (vdelay.usec != 0)) {
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tclScaleTimeProcPtr(&vdelay, tclTimeClientData);
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}
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delay.tv_sec = vdelay.sec;
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delay.tv_usec = vdelay.usec;
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/*
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* Special note: must convert delay.tv_sec to int before comparing to
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* 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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#endif /* HAVE_COREFOUNDATION */
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 4
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* fill-column: 78
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* End:
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*/
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