/[jscoverage]/trunk/js/jstask.cpp
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Annotation of /trunk/js/jstask.cpp

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Revision 507 - (hide annotations)
Sun Jan 10 07:23:34 2010 UTC (9 years, 10 months ago) by siliconforks
File size: 3470 byte(s)
Update SpiderMonkey from Firefox 3.6rc1.

1 siliconforks 507 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2     * vim: set ts=4 sw=4 et tw=99 ft=cpp:
3     *
4     * ***** BEGIN LICENSE BLOCK *****
5     * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6     *
7     * The contents of this file are subject to the Mozilla Public License Version
8     * 1.1 (the "License"); you may not use this file except in compliance with
9     * the License. You may obtain a copy of the License at
10     * http://www.mozilla.org/MPL/
11     *
12     * Software distributed under the License is distributed on an "AS IS" basis,
13     * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14     * for the specific language governing rights and limitations under the
15     * License.
16     *
17     * The Original Code is Mozilla SpiderMonkey JavaScript 1.9.1 code, released
18     * June 30, 2009.
19     *
20     * The Initial Developer of the Original Code is
21     * Andreas Gal <gal@mozilla.com>
22     *
23     * Contributor(s):
24     *
25     * Alternatively, the contents of this file may be used under the terms of
26     * either of the GNU General Public License Version 2 or later (the "GPL"),
27     * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28     * in which case the provisions of the GPL or the LGPL are applicable instead
29     * of those above. If you wish to allow use of your version of this file only
30     * under the terms of either the GPL or the LGPL, and not to allow others to
31     * use your version of this file under the terms of the MPL, indicate your
32     * decision by deleting the provisions above and replace them with the notice
33     * and other provisions required by the GPL or the LGPL. If you do not delete
34     * the provisions above, a recipient may use your version of this file under
35     * the terms of any one of the MPL, the GPL or the LGPL.
36     *
37     * ***** END LICENSE BLOCK ***** */
38    
39     #include "jstask.h"
40    
41     #ifdef JS_THREADSAFE
42     static void start(void* arg) {
43     ((JSBackgroundThread*)arg)->work();
44     }
45    
46     JSBackgroundThread::JSBackgroundThread()
47     : thread(NULL), stack(NULL), lock(NULL), wakeup(NULL), shutdown(false)
48     {
49     }
50    
51     JSBackgroundThread::~JSBackgroundThread()
52     {
53     if (wakeup)
54     PR_DestroyCondVar(wakeup);
55     if (lock)
56     PR_DestroyLock(lock);
57     /* PR_DestroyThread is not necessary. */
58     }
59    
60     bool
61     JSBackgroundThread::init()
62     {
63     if (!(lock = PR_NewLock()))
64     return false;
65     if (!(wakeup = PR_NewCondVar(lock)))
66     return false;
67     thread = PR_CreateThread(PR_USER_THREAD, start, this, PR_PRIORITY_LOW,
68     PR_LOCAL_THREAD, PR_JOINABLE_THREAD, 0);
69     return !!thread;
70     }
71    
72     void
73     JSBackgroundThread::cancel()
74     {
75     PR_Lock(lock);
76     if (shutdown) {
77     PR_Unlock(lock);
78     return;
79     }
80     shutdown = true;
81     PR_NotifyCondVar(wakeup);
82     PR_Unlock(lock);
83     PR_JoinThread(thread);
84     }
85    
86     void
87     JSBackgroundThread::work()
88     {
89     PR_Lock(lock);
90     while (!shutdown) {
91     PR_WaitCondVar(wakeup, PR_INTERVAL_NO_TIMEOUT);
92     JSBackgroundTask* t;
93     while ((t = stack) != NULL) {
94     stack = t->next;
95     PR_Unlock(lock);
96     t->run();
97     delete t;
98     PR_Lock(lock);
99     }
100     }
101     PR_Unlock(lock);
102     }
103    
104     bool
105     JSBackgroundThread::busy()
106     {
107     return !!stack; // we tolerate some racing here
108     }
109    
110     void
111     JSBackgroundThread::schedule(JSBackgroundTask* task)
112     {
113     PR_Lock(lock);
114     if (shutdown) {
115     PR_Unlock(lock);
116     task->run();
117     delete task;
118     return;
119     }
120     task->next = stack;
121     stack = task;
122     PR_NotifyCondVar(wakeup);
123     PR_Unlock(lock);
124     }
125    
126     #endif

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