1 files changed, 76 insertions, 0 deletions
diff --git a/tcl/unix/tclUnixEvent.c b/tcl/unix/tclUnixEvent.c
new file mode 100644
index 00000000000..2a2a67bab2d
--- /dev/null
+++ b/tcl/unix/tclUnixEvent.c
@@ -0,0 +1,76 @@
+/* 
+ * 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.
+ *
+ * RCS: @(#) $Id$
+ */
+
+#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);
+    }
+}