author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
parent 1247 | b4c26443dee5 |
child 2433 | 9f0ab7f726b8 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright 2005-2009 Sun Microsystems, Inc. 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. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package sun.nio.ch; |
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import java.io.IOException; |
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import java.util.LinkedList; |
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import java.util.HashSet; |
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/** |
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* Manipulates a native array of epoll_event structs on Linux: |
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* |
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* typedef union epoll_data { |
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* void *ptr; |
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* int fd; |
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* __uint32_t u32; |
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* __uint64_t u64; |
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* } epoll_data_t; |
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* |
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* struct epoll_event { |
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* __uint32_t events; |
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* epoll_data_t data; |
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* }; |
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* |
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* The system call to wait for I/O events is epoll_wait(2). It populates an |
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* array of epoll_event structures that are passed to the call. The data |
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* member of the epoll_event structure contains the same data as was set |
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* when the file descriptor was registered to epoll via epoll_ctl(2). In |
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* this implementation we set data.fd to be the file descriptor that we |
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* register. That way, we have the file descriptor available when we |
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* process the events. |
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* |
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* All file descriptors registered with epoll have the POLLHUP and POLLERR |
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* events enabled even when registered with an event set of 0. To ensure |
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* that epoll_wait doesn't poll an idle file descriptor when the underlying |
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* connection is closed or reset then its registration is deleted from |
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* epoll (it will be re-added again if the event set is changed) |
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*/ |
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class EPollArrayWrapper { |
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// EPOLL_EVENTS |
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static final int EPOLLIN = 0x001; |
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// opcodes |
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static final int EPOLL_CTL_ADD = 1; |
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static final int EPOLL_CTL_DEL = 2; |
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static final int EPOLL_CTL_MOD = 3; |
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// Miscellaneous constants |
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static final int SIZE_EPOLLEVENT = sizeofEPollEvent(); |
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static final int EVENT_OFFSET = 0; |
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static final int DATA_OFFSET = offsetofData(); |
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static final int FD_OFFSET = DATA_OFFSET; |
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static final int NUM_EPOLLEVENTS = Math.min(fdLimit(), 8192); |
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// Base address of the native pollArray |
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private final long pollArrayAddress; |
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// Set of "idle" file descriptors |
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private final HashSet<Integer> idleSet; |
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EPollArrayWrapper() { |
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// creates the epoll file descriptor |
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epfd = epollCreate(); |
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// the epoll_event array passed to epoll_wait |
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int allocationSize = NUM_EPOLLEVENTS * SIZE_EPOLLEVENT; |
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pollArray = new AllocatedNativeObject(allocationSize, true); |
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pollArrayAddress = pollArray.address(); |
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for (int i=0; i<NUM_EPOLLEVENTS; i++) { |
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putEventOps(i, 0); |
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putData(i, 0L); |
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} |
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// create idle set |
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idleSet = new HashSet<Integer>(); |
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} |
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// Used to update file description registrations |
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private static class Updator { |
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int opcode; |
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int fd; |
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int events; |
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Updator(int opcode, int fd, int events) { |
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this.opcode = opcode; |
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this.fd = fd; |
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this.events = events; |
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} |
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} |
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private LinkedList<Updator> updateList = new LinkedList<Updator>(); |
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// The epoll_event array for results from epoll_wait |
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private AllocatedNativeObject pollArray; |
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// The fd of the epoll driver |
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final int epfd; |
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// The fd of the interrupt line going out |
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int outgoingInterruptFD; |
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// The fd of the interrupt line coming in |
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int incomingInterruptFD; |
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// The index of the interrupt FD |
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int interruptedIndex; |
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// Number of updated pollfd entries |
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int updated; |
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void initInterrupt(int fd0, int fd1) { |
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outgoingInterruptFD = fd1; |
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incomingInterruptFD = fd0; |
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epollCtl(epfd, EPOLL_CTL_ADD, fd0, EPOLLIN); |
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} |
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void putEventOps(int i, int event) { |
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int offset = SIZE_EPOLLEVENT * i + EVENT_OFFSET; |
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pollArray.putInt(offset, event); |
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} |
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void putData(int i, long value) { |
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int offset = SIZE_EPOLLEVENT * i + DATA_OFFSET; |
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pollArray.putLong(offset, value); |
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} |
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void putDescriptor(int i, int fd) { |
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int offset = SIZE_EPOLLEVENT * i + FD_OFFSET; |
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pollArray.putInt(offset, fd); |
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} |
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int getEventOps(int i) { |
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int offset = SIZE_EPOLLEVENT * i + EVENT_OFFSET; |
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return pollArray.getInt(offset); |
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} |
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int getDescriptor(int i) { |
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int offset = SIZE_EPOLLEVENT * i + FD_OFFSET; |
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return pollArray.getInt(offset); |
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} |
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/** |
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* Update the events for a given file descriptor. |
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*/ |
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void setInterest(int fd, int mask) { |
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synchronized (updateList) { |
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// if the interest events are 0 then add to idle set, and delete |
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// from epoll if registered (or pending) |
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if (mask == 0) { |
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if (idleSet.add(fd)) { |
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updateList.add(new Updator(EPOLL_CTL_DEL, fd, 0)); |
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} |
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return; |
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} |
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// if file descriptor is idle then add to epoll |
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if (!idleSet.isEmpty() && idleSet.remove(fd)) { |
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updateList.add(new Updator(EPOLL_CTL_ADD, fd, mask)); |
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return; |
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} |
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// if the previous pending operation is to add this file descriptor |
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// to epoll then update its event set |
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if (updateList.size() > 0) { |
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Updator last = updateList.getLast(); |
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if (last.fd == fd && last.opcode == EPOLL_CTL_ADD) { |
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last.events = mask; |
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return; |
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} |
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} |
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// update existing registration |
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updateList.add(new Updator(EPOLL_CTL_MOD, fd, mask)); |
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} |
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} |
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/** |
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* Add a new file descriptor to epoll |
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*/ |
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void add(int fd) { |
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synchronized (updateList) { |
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updateList.add(new Updator(EPOLL_CTL_ADD, fd, 0)); |
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} |
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} |
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/** |
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* Remove a file descriptor from epoll |
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*/ |
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void release(int fd) { |
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synchronized (updateList) { |
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// if file descriptor is idle then remove from idle set, otherwise |
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// delete from epoll |
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if (!idleSet.remove(fd)) { |
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updateList.add(new Updator(EPOLL_CTL_DEL, fd, 0)); |
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} |
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} |
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} |
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/** |
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* Close epoll file descriptor and free poll array |
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*/ |
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void closeEPollFD() throws IOException { |
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FileDispatcherImpl.closeIntFD(epfd); |
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pollArray.free(); |
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} |
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int poll(long timeout) throws IOException { |
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updateRegistrations(); |
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updated = epollWait(pollArrayAddress, NUM_EPOLLEVENTS, timeout, epfd); |
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for (int i=0; i<updated; i++) { |
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if (getDescriptor(i) == incomingInterruptFD) { |
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interruptedIndex = i; |
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interrupted = true; |
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break; |
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} |
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} |
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return updated; |
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} |
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/** |
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* Update the pending registrations. |
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*/ |
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void updateRegistrations() { |
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synchronized (updateList) { |
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Updator u = null; |
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while ((u = updateList.poll()) != null) { |
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epollCtl(epfd, u.opcode, u.fd, u.events); |
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} |
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} |
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} |
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// interrupt support |
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boolean interrupted = false; |
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public void interrupt() { |
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interrupt(outgoingInterruptFD); |
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} |
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public int interruptedIndex() { |
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return interruptedIndex; |
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} |
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boolean interrupted() { |
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return interrupted; |
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} |
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void clearInterrupted() { |
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interrupted = false; |
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} |
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static { |
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init(); |
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} |
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private native int epollCreate(); |
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private native void epollCtl(int epfd, int opcode, int fd, int events); |
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private native int epollWait(long pollAddress, int numfds, long timeout, |
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int epfd) throws IOException; |
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private static native int sizeofEPollEvent(); |
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private static native int offsetofData(); |
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private static native int fdLimit(); |
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private static native void interrupt(int fd); |
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private static native void init(); |
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} |