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authorrjohnson <rjohnson>1998-03-26 14:56:55 (GMT)
committerrjohnson <rjohnson>1998-03-26 14:56:55 (GMT)
commit72d823b9193f9ee2b0318563b49363cd08c11f24 (patch)
treec168cc164a71f320db9dcdfe7518ba7bd0d2c8d9 /unix/tclUnixEvent.c
parent2b5738da524e944cda39e24c0a87b745a43bd8c3 (diff)
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diff --git a/unix/tclUnixEvent.c b/unix/tclUnixEvent.c
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+/*
+ * tclUnixEvent.c --
+ *
+ * This file implements Unix specific event related routines.
+ *
+ * Copyright (c) 1997 by Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tclUnixEvent.c 1.1 97/03/04 14:19:34
+ */
+
+#include "tclInt.h"
+#include "tclPort.h"
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tcl_Sleep --
+ *
+ * Delay execution for the specified number of milliseconds.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Time passes.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tcl_Sleep(ms)
+ int ms; /* Number of milliseconds to sleep. */
+{
+ static struct timeval delay;
+ Tcl_Time before, after;
+
+ /*
+ * The only trick here is that select appears to return early
+ * under some conditions, so we have to check to make sure that
+ * the right amount of time really has elapsed. If it's too
+ * early, go back to sleep again.
+ */
+
+ TclpGetTime(&before);
+ after = before;
+ after.sec += ms/1000;
+ after.usec += (ms%1000)*1000;
+ if (after.usec > 1000000) {
+ after.usec -= 1000000;
+ after.sec += 1;
+ }
+ while (1) {
+ delay.tv_sec = after.sec - before.sec;
+ delay.tv_usec = after.usec - before.usec;
+ if (delay.tv_usec < 0) {
+ delay.tv_usec += 1000000;
+ delay.tv_sec -= 1;
+ }
+
+ /*
+ * Special note: must convert delay.tv_sec to int before comparing
+ * to zero, since delay.tv_usec is unsigned on some platforms.
+ */
+
+ if ((((int) delay.tv_sec) < 0)
+ || ((delay.tv_usec == 0) && (delay.tv_sec == 0))) {
+ break;
+ }
+ (void) select(0, (SELECT_MASK *) 0, (SELECT_MASK *) 0,
+ (SELECT_MASK *) 0, &delay);
+ TclpGetTime(&before);
+ }
+}