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

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Revision 507 - (show annotations)
Sun Jan 10 07:23:34 2010 UTC (9 years, 8 months ago) by siliconforks
File size: 3470 byte(s)
Update SpiderMonkey from Firefox 3.6rc1.

1 /* -*- 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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