1 : /* ***** BEGIN LICENSE BLOCK *****
2 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
3 : *
4 : * The contents of this file are subject to the Mozilla Public License Version
5 : * 1.1 (the "License"); you may not use this file except in compliance with
6 : * the License. You may obtain a copy of the License at
7 : * http://www.mozilla.org/MPL/
8 : *
9 : * Software distributed under the License is distributed on an "AS IS" basis,
10 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11 : * for the specific language governing rights and limitations under the
12 : * License.
13 : *
14 : * The Original Code is mozilla.org code.
15 : *
16 : * The Initial Developer of the Original Code is
17 : * The Mozilla Foundation.
18 : * Portions created by the Initial Developer are Copyright (C) 2011
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : * Ted Mielczarek <ted.mielczarek@gmail.com>
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either the GNU General Public License Version 2 or later (the "GPL"), or
26 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
28 : * of those above. If you wish to allow use of your version of this file only
29 : * under the terms of either the GPL or the LGPL, and not to allow others to
30 : * use your version of this file under the terms of the MPL, indicate your
31 : * decision by deleting the provisions above and replace them with the notice
32 : * and other provisions required by the GPL or the LGPL. If you do not delete
33 : * the provisions above, a recipient may use your version of this file under
34 : * the terms of any one of the MPL, the GPL or the LGPL.
35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #include "mozilla/WidgetTraceEvent.h"
39 :
40 : #include <glib.h>
41 : #include <mozilla/CondVar.h>
42 : #include <mozilla/Mutex.h>
43 : #include <stdio.h>
44 :
45 : using mozilla::CondVar;
46 : using mozilla::Mutex;
47 : using mozilla::MutexAutoLock;
48 :
49 : namespace {
50 :
51 : Mutex* sMutex = NULL;
52 : CondVar* sCondVar = NULL;
53 : bool sTracerProcessed = false;
54 :
55 : // This function is called from the main (UI) thread.
56 0 : gboolean TracerCallback(gpointer data)
57 : {
58 0 : mozilla::SignalTracerThread();
59 0 : return FALSE;
60 : }
61 :
62 : } // namespace
63 :
64 : namespace mozilla {
65 :
66 0 : bool InitWidgetTracing()
67 : {
68 0 : sMutex = new Mutex("Event tracer thread mutex");
69 0 : sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
70 0 : return sMutex && sCondVar;
71 : }
72 :
73 0 : void CleanUpWidgetTracing()
74 : {
75 0 : delete sMutex;
76 0 : delete sCondVar;
77 0 : sMutex = NULL;
78 0 : sCondVar = NULL;
79 0 : }
80 :
81 : // This function is called from the background tracer thread.
82 0 : bool FireAndWaitForTracerEvent()
83 : {
84 0 : NS_ABORT_IF_FALSE(sMutex && sCondVar, "Tracing not initialized!");
85 :
86 : // Send a default-priority idle event through the
87 : // event loop, and wait for it to finish.
88 0 : MutexAutoLock lock(*sMutex);
89 0 : NS_ABORT_IF_FALSE(!sTracerProcessed, "Tracer synchronization state is wrong");
90 : g_idle_add_full(G_PRIORITY_DEFAULT,
91 : TracerCallback,
92 : NULL,
93 0 : NULL);
94 0 : while (!sTracerProcessed)
95 0 : sCondVar->Wait();
96 0 : sTracerProcessed = false;
97 0 : return true;
98 : }
99 :
100 0 : void SignalTracerThread()
101 : {
102 0 : if (!sMutex || !sCondVar)
103 0 : return;
104 0 : MutexAutoLock lock(*sMutex);
105 0 : NS_ABORT_IF_FALSE(!sTracerProcessed, "Tracer synchronization state is wrong");
106 0 : sTracerProcessed = true;
107 0 : sCondVar->Notify();
108 : }
109 :
110 : } // namespace mozilla
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