author | michaelm |
Tue, 24 Sep 2019 16:19:11 +0100 | |
changeset 58295 | 7973073dd048 |
permissions | -rw-r--r-- |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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/* |
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.ch; |
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import java.io.FileDescriptor; |
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import java.io.IOException; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.AsynchronousCloseException; |
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import java.nio.channels.ByteChannel; |
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import java.nio.channels.ClosedChannelException; |
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import java.nio.channels.NotYetConnectedException; |
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import java.nio.channels.spi.AbstractInterruptibleChannel; |
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import java.util.Objects; |
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import java.util.concurrent.locks.ReentrantLock; |
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import static java.util.concurrent.TimeUnit.NANOSECONDS; |
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class UnixDomainSocketChannelImpl |
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extends AbstractInterruptibleChannel |
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implements ByteChannel |
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{ |
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// Used to make native read and write calls |
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private static final NativeDispatcher nd = new SocketDispatcher(); |
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// Our file descriptor object |
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private final FileDescriptor fd; |
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// Lock held by current reading or connecting thread |
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private final ReentrantLock readLock = new ReentrantLock(); |
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|
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// Lock held by current writing or connecting thread |
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private final ReentrantLock writeLock = new ReentrantLock(); |
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// Lock for managing close state |
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private final Object stateLock = new Object(); |
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// Channel state |
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private static final int ST_INUSE = 0; |
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private static final int ST_CLOSING = 1; |
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private static final int ST_CLOSED = 2; |
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private int state; |
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// IDs of native threads doing reads and writes, for signalling |
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private long readerThread; |
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private long writerThread; |
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UnixDomainSocketChannelImpl(FileDescriptor fd) |
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throws IOException |
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{ |
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this.fd = fd; |
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} |
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/** |
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* Checks that the channel is open. |
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* |
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* @throws ClosedChannelException if channel is closed (or closing) |
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*/ |
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private void ensureOpen() throws ClosedChannelException { |
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if (!isOpen()) |
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throw new ClosedChannelException(); |
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} |
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/** |
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* Closes the socket if there are no I/O operations in progress |
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*/ |
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private boolean tryClose() throws IOException { |
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assert Thread.holdsLock(stateLock) && state == ST_CLOSING; |
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if (readerThread == 0 && writerThread == 0) { |
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state = ST_CLOSED; |
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nd.close(fd); |
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return true; |
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} else { |
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return false; |
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} |
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} |
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/** |
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* Complete closure of pre-closed socket (release the file descriptor) |
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*/ |
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private void tryFinishClose() { |
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try { |
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tryClose(); |
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} catch (IOException ignore) { } |
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} |
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/** |
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* Marks the beginning of a read operation |
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* |
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* @throws ClosedChannelException if the channel is closed |
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* @throws NotYetConnectedException if the channel is not yet connected |
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*/ |
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private void beginRead() throws ClosedChannelException { |
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// set hook for Thread.interrupt |
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begin(); |
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synchronized (stateLock) { |
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ensureOpen(); |
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readerThread = NativeThread.current(); |
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} |
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} |
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/** |
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* Marks the end of a read operation that may have blocked. |
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* |
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* @throws AsynchronousCloseException if the channel was closed due to this |
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* thread being interrupted on a blocking read operation. |
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*/ |
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private void endRead(boolean completed) |
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130 |
throws AsynchronousCloseException |
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|
131 |
{ |
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|
132 |
synchronized (stateLock) { |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
133 |
readerThread = 0; |
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|
134 |
if (state == ST_CLOSING) { |
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|
135 |
tryFinishClose(); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
136 |
} |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
137 |
} |
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|
138 |
end(completed); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
139 |
} |
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|
140 |
|
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|
141 |
@Override |
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142 |
public int read(ByteBuffer buf) throws IOException { |
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143 |
Objects.requireNonNull(buf); |
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|
144 |
|
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|
145 |
readLock.lock(); |
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|
146 |
try { |
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|
147 |
int n = 0; |
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|
148 |
try { |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
149 |
beginRead(); |
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150 |
n = IOUtil.read(fd, buf, -1, nd); |
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151 |
while (IOStatus.okayToRetry(n) && isOpen()) { |
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152 |
park(Net.POLLIN, 0L); |
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153 |
n = IOUtil.read(fd, buf, -1, nd); |
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154 |
} |
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|
155 |
} finally { |
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|
156 |
endRead(n > 0); |
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|
157 |
} |
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|
158 |
return n; |
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|
159 |
} finally { |
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|
160 |
readLock.unlock(); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
161 |
} |
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|
162 |
} |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
163 |
|
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|
164 |
/** |
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|
165 |
* Marks the beginning of a write operation that might block. |
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|
166 |
* |
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|
167 |
* @throws ClosedChannelException if the channel is closed |
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|
168 |
* @throws NotYetConnectedException if the channel is not yet connected |
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|
169 |
*/ |
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170 |
private void beginWrite() throws ClosedChannelException { |
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|
171 |
begin(); |
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|
172 |
synchronized (stateLock) { |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
173 |
// set hook for Thread.interrupt |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
174 |
ensureOpen(); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
175 |
writerThread = NativeThread.current(); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
176 |
} |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
177 |
} |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
178 |
|
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|
179 |
/** |
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|
180 |
* Marks the end of a write operation that may have blocked. |
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|
181 |
* |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
182 |
* @throws AsynchronousCloseException if the channel was closed due to this |
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|
183 |
* thread being interrupted on a blocking write operation. |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
184 |
*/ |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
185 |
private void endWrite(boolean completed) |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
186 |
throws AsynchronousCloseException |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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|
187 |
{ |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
188 |
synchronized (stateLock) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
189 |
writerThread = 0; |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
190 |
if (state == ST_CLOSING) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
191 |
tryFinishClose(); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
192 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
193 |
} |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
194 |
end(completed); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
195 |
} |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
196 |
|
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
197 |
void park(int event, long nanos) throws IOException { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
198 |
long millis; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
199 |
if (nanos <= 0) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
200 |
millis = -1; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
201 |
} else { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
202 |
millis = NANOSECONDS.toMillis(nanos); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
203 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
204 |
Net.poll(fd, event, millis); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
205 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
206 |
|
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
207 |
@Override |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
208 |
public int write(ByteBuffer buf) throws IOException { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
209 |
Objects.requireNonNull(buf); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
210 |
|
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
211 |
writeLock.lock(); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
212 |
try { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
213 |
int n = 0; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
214 |
try { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
215 |
beginWrite(); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
216 |
n = IOUtil.write(fd, buf, -1, nd); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
217 |
while (IOStatus.okayToRetry(n) && isOpen()) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
218 |
park(Net.POLLOUT, 0L); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
219 |
n = IOUtil.write(fd, buf, -1, nd); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
220 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
221 |
} finally { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
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diff
changeset
|
222 |
endWrite(n > 0); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
223 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
224 |
return n; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
225 |
} finally { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
226 |
writeLock.unlock(); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
227 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
228 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
229 |
|
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
230 |
/** |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
231 |
* Closes this channel |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
232 |
* |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
233 |
* If there is an I/O operation in progress then the socket is pre-closed |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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changeset
|
234 |
* and the I/O threads signalled, in which case the final close is deferred |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
235 |
* until all I/O operations complete. |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
236 |
*/ |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
237 |
@Override |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
238 |
protected void implCloseChannel() throws IOException { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
239 |
synchronized (stateLock) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
240 |
assert state == ST_INUSE; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
241 |
state = ST_CLOSING; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
242 |
if (!tryClose()) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
243 |
long reader = readerThread; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
244 |
long writer = writerThread; |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
245 |
if (reader != 0 || writer != 0) { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
246 |
nd.preClose(fd); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
247 |
if (reader != 0) |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
248 |
NativeThread.signal(reader); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
249 |
if (writer != 0) |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
250 |
NativeThread.signal(writer); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
251 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
252 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
253 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
254 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
255 |
|
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
256 |
@Override |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
257 |
public String toString() { |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
258 |
StringBuilder sb = new StringBuilder(); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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diff
changeset
|
259 |
sb.append(this.getClass().getSuperclass().getName()); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
260 |
sb.append('['); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
261 |
if (!isOpen()) |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
262 |
sb.append("closed"); |
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8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
263 |
sb.append(']'); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
diff
changeset
|
264 |
return sb.toString(); |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
michaelm
parents:
diff
changeset
|
265 |
} |
7973073dd048
8231187: SelectorProvider.inheritedChannel() returns TCP socket channel for Unix domain socket
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parents:
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changeset
|
266 |
} |