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[eos/base.git] / util / src / TclTk / tcl8.6.12 / unix / tclUnixEvent.c

diff --git a/util/src/TclTk/tcl8.6.12/unix/tclUnixEvent.c b/util/src/TclTk/tcl8.6.12/unix/tclUnixEvent.c
new file mode 100644 (file)
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+++ b/util/src/TclTk/tcl8.6.12/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.
+ */
+
+#include "tclInt.h"
+#ifndef HAVE_COREFOUNDATION    /* Darwin/Mac OS X CoreFoundation notifier is
+                                * in tclMacOSXNotify.c */
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tcl_Sleep --
+ *
+ *     Delay execution for the specified number of milliseconds.
+ *
+ * Results:
+ *     None.
+ *
+ * Side effects:
+ *     Time passes.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tcl_Sleep(
+    int ms)                    /* Number of milliseconds to sleep. */
+{
+    struct timeval delay;
+    Tcl_Time before, after, vdelay;
+
+    /*
+     * 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.
+     */
+
+    Tcl_GetTime(&before);
+    after = before;
+    after.sec += ms/1000;
+    after.usec += (ms%1000)*1000;
+    if (after.usec > 1000000) {
+       after.usec -= 1000000;
+       after.sec += 1;
+    }
+    while (1) {
+       /*
+        * TIP #233: Scale from virtual time to real-time for select.
+        */
+
+       vdelay.sec  = after.sec  - before.sec;
+       vdelay.usec = after.usec - before.usec;
+
+       if (vdelay.usec < 0) {
+           vdelay.usec += 1000000;
+           vdelay.sec  -= 1;
+       }
+
+       if ((vdelay.sec != 0) || (vdelay.usec != 0)) {
+           tclScaleTimeProcPtr(&vdelay, tclTimeClientData);
+       }
+
+       delay.tv_sec  = vdelay.sec;
+       delay.tv_usec = vdelay.usec;
+
+       /*
+        * 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);
+       Tcl_GetTime(&before);
+    }
+}
+\f
+#endif /* HAVE_COREFOUNDATION */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */