1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
* Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
*/
package com.jogamp.opengl.impl;
import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import com.jogamp.common.JogampRuntimeException;
import com.jogamp.common.util.*;
import javax.media.nativewindow.NativeWindowFactory;
import javax.media.opengl.GLException;
import javax.media.opengl.GLProfile;
/** Implementation of the {@link javax.media.opengl.Threading} class. */
public class ThreadingImpl {
public static final int AWT = 1;
public static final int WORKER = 2;
protected static final boolean DEBUG = Debug.debug("Threading");
private static boolean singleThreaded = true;
private static int mode;
private static boolean hasAWT;
// We need to know whether we're running on X11 platforms to change
// our behavior when the Java2D/JOGL bridge is active
private static boolean _isX11;
private static final ThreadingPlugin threadingPlugin;
static {
Object threadingPluginTmp =
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
String workaround = Debug.getProperty("jogl.1thread", true);
ClassLoader cl = ThreadingImpl.class.getClassLoader();
// Default to using the AWT thread on all platforms except
// Windows. On OS X there is instability apparently due to
// using the JAWT on non-AWT threads. On X11 platforms there
// are potential deadlocks which can be caused if the AWT
// EventQueue thread hands work off to the GLWorkerThread
// while holding the AWT lock. The optimization of
// makeCurrent / release calls isn't worth these stability
// problems.
hasAWT = GLProfile.isAWTAvailable();
String osType = NativeWindowFactory.getNativeWindowType(false);
_isX11 = NativeWindowFactory.TYPE_X11.equals(osType);
int defaultMode = ( hasAWT ? AWT : WORKER );
mode = defaultMode;
if (workaround != null) {
workaround = workaround.toLowerCase();
if (workaround.equals("true") ||
workaround.equals("auto")) {
// Nothing to do; singleThreaded and mode already set up
} else if (workaround.equals("worker")) {
singleThreaded = true;
mode = WORKER;
} else if (hasAWT && workaround.equals("awt")) {
singleThreaded = true;
mode = AWT;
} else {
singleThreaded = false;
}
}
printWorkaroundNotice();
Object threadingPluginObj=null;
if(hasAWT) {
// try to fetch the AWTThreadingPlugin
Exception error=null;
try {
threadingPluginObj = ReflectionUtil.createInstance("com.jogamp.opengl.impl.awt.AWTThreadingPlugin", cl);
} catch (JogampRuntimeException jre) { error = jre; }
if(AWT == mode && null==threadingPluginObj) {
throw new GLException("Mode is AWT, but class 'com.jogamp.opengl.impl.awt.AWTThreadingPlugin' is not available", error);
}
}
return threadingPluginObj;
}
});
threadingPlugin = (ThreadingPlugin) threadingPluginTmp;
if(DEBUG) {
System.err.println("Threading: hasAWT "+hasAWT+", mode "+((mode==AWT)?"AWT":"WORKER")+", plugin "+threadingPlugin);
}
}
/** No reason to ever instantiate this class */
private ThreadingImpl() {}
public static boolean isX11() { return _isX11; }
public static int getMode() { return mode; }
/** If an implementation of the javax.media.opengl APIs offers a
multithreading option but the default behavior is single-threading,
this API provides a mechanism for end users to disable single-threading
in this implementation. Users are strongly discouraged from
calling this method unless they are aware of all of the
consequences and are prepared to enforce some amount of
threading restrictions in their applications. Disabling
single-threading, for example, may have unintended consequences
on GLAutoDrawable implementations such as GLCanvas, GLJPanel and
GLPbuffer. Currently there is no supported way to re-enable it
once disabled, partly to discourage careless use of this
method. This method should be called as early as possible in an
application. */
public static void disableSingleThreading() {
singleThreaded = false;
if (Debug.verbose()) {
System.err.println("Application forced disabling of single-threading of javax.media.opengl implementation");
}
}
/** Indicates whether OpenGL work is being automatically forced to a
single thread in this implementation. */
public static boolean isSingleThreaded() {
return singleThreaded;
}
/** Indicates whether the current thread is the single thread on
which this implementation of the javax.media.opengl APIs
performs all of its OpenGL-related work. This method should only
be called if the single-thread model is in effect. */
public static boolean isOpenGLThread() throws GLException {
if (!isSingleThreaded()) {
throw new GLException("Should only call this in single-threaded mode");
}
if(null!=threadingPlugin) {
return threadingPlugin.isOpenGLThread();
}
switch (mode) {
case AWT:
throw new InternalError();
case WORKER:
return GLWorkerThread.isWorkerThread();
default:
throw new InternalError("Illegal single-threading mode " + mode);
}
}
/** Executes the passed Runnable on the single thread used for all
OpenGL work in this javax.media.opengl API implementation. It is
not specified exactly which thread is used for this
purpose. This method should only be called if the single-thread
model is in use and if the current thread is not the OpenGL
thread (i.e., if <code>isOpenGLThread()</code> returns
false). It is up to the end user to check to see whether the
current thread is the OpenGL thread and either execute the
Runnable directly or perform the work inside it. */
public static void invokeOnOpenGLThread(Runnable r) throws GLException {
if (!isSingleThreaded()) {
throw new GLException ("Should only call this in single-threaded mode");
}
if (isOpenGLThread()) {
throw new GLException ("Should only call this from other threads than the OpenGL thread");
}
if(null!=threadingPlugin) {
threadingPlugin.invokeOnOpenGLThread(r);
return;
}
switch (mode) {
case AWT:
throw new InternalError();
case WORKER:
if (!GLWorkerThread.isStarted()) {
synchronized (GLWorkerThread.class) {
if (!GLWorkerThread.isStarted()) {
GLWorkerThread.start();
}
}
}
try {
GLWorkerThread.invokeAndWait(r);
} catch (InvocationTargetException e) {
throw new GLException(e.getTargetException());
} catch (InterruptedException e) {
throw new GLException(e);
}
break;
default:
throw new InternalError("Illegal single-threading mode " + mode);
}
}
/** This is a workaround for AWT-related deadlocks which only seem
to show up in the context of applets */
public static boolean isAWTMode() {
return (mode == AWT);
}
private static void printWorkaroundNotice() {
if (singleThreaded && Debug.verbose()) {
System.err.println("Using " +
(mode == AWT ? "AWT" : "OpenGL worker") +
" thread for performing OpenGL work in javax.media.opengl implementation");
}
}
}
|
