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      1 /*
      2  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2006 Michael Emmel mike.emmel (at) gmail.com
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "config.h"
     29 #include "SharedTimer.h"
     30 
     31 #include <wtf/Assertions.h>
     32 #include <wtf/CurrentTime.h>
     33 #include <glib.h>
     34 
     35 namespace WebCore {
     36 
     37 static guint sharedTimer;
     38 static void (*sharedTimerFiredFunction)();
     39 
     40 void setSharedTimerFiredFunction(void (*f)())
     41 {
     42     sharedTimerFiredFunction = f;
     43 }
     44 
     45 static gboolean timeout_cb(gpointer)
     46 {
     47     if (sharedTimerFiredFunction)
     48         sharedTimerFiredFunction();
     49     return FALSE;
     50 }
     51 
     52 void setSharedTimerFireTime(double fireTime)
     53 {
     54     ASSERT(sharedTimerFiredFunction);
     55 
     56     double interval = fireTime - currentTime();
     57     guint intervalInMS;
     58     if (interval < 0)
     59         intervalInMS = 0;
     60     else {
     61         interval *= 1000;
     62         intervalInMS = (guint)interval;
     63     }
     64 
     65     stopSharedTimer();
     66     if (intervalInMS == 0)
     67         sharedTimer = g_idle_add(timeout_cb, NULL);
     68     else
     69         sharedTimer = g_timeout_add_full(G_PRIORITY_DEFAULT, intervalInMS, timeout_cb, NULL, NULL);
     70 }
     71 
     72 void stopSharedTimer()
     73 {
     74     gboolean s = FALSE;
     75     if (sharedTimer == 0)
     76         return;
     77 
     78     s = g_source_remove(sharedTimer);
     79     ASSERT(s);
     80     sharedTimer = 0;
     81 }
     82 
     83 }
     84