author | alanb |
Thu, 07 Oct 2010 14:36:17 +0100 | |
changeset 6850 | 56966b0a6a0d |
parent 5983 | b5bc332cd233 |
child 7668 | d4a77089c587 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2008, 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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/* |
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*/ |
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/* Maximum number of sockets per select() */ |
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/* This number should be equal to WindowsSelectorImpl.MAX_SELECTABLE_FDS */ |
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/* This definition MUST precede the inclusion of winsock2.h */ |
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#define FD_SETSIZE 1024 |
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#include <stdlib.h> |
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#include "jvm.h" |
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#include "jni.h" |
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#include "jni_util.h" |
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#include "sun_nio_ch_WindowsSelectorImpl.h" |
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#include "sun_nio_ch_PollArrayWrapper.h" |
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#include "winsock2.h" |
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typedef struct { |
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jint fd; |
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jshort events; |
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} pollfd; |
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#define WAKEUP_SOCKET_BUF_SIZE 16 |
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JNIEXPORT jint JNICALL |
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Java_sun_nio_ch_WindowsSelectorImpl_00024SubSelector_poll0(JNIEnv *env, jobject this, |
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jlong pollAddress, jint numfds, |
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jintArray returnReadFds, jintArray returnWriteFds, |
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jintArray returnExceptFds, jlong timeout) |
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{ |
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DWORD result = 0; |
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pollfd *fds = (pollfd *) pollAddress; |
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int i; |
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FD_SET readfds, writefds, exceptfds; |
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struct timeval timevalue, *tv; |
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static struct timeval zerotime = {0, 0}; |
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int read_count = 0, write_count = 0, except_count = 0; |
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#ifdef _WIN64 |
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int resultbuf[FD_SETSIZE + 1]; |
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#endif |
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if (timeout == 0) { |
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tv = &zerotime; |
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} else if (timeout < 0) { |
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tv = NULL; |
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} else { |
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tv = &timevalue; |
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tv->tv_sec = (long)(timeout / 1000); |
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tv->tv_usec = (long)((timeout % 1000) * 1000); |
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} |
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/* Set FD_SET structures required for select */ |
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for (i = 0; i < numfds; i++) { |
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if (fds[i].events & sun_nio_ch_PollArrayWrapper_POLLIN) { |
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readfds.fd_array[read_count] = fds[i].fd; |
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read_count++; |
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} |
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if (fds[i].events & (sun_nio_ch_PollArrayWrapper_POLLOUT | |
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sun_nio_ch_PollArrayWrapper_POLLCONN)) |
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{ |
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writefds.fd_array[write_count] = fds[i].fd; |
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write_count++; |
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} |
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exceptfds.fd_array[except_count] = fds[i].fd; |
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except_count++; |
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} |
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readfds.fd_count = read_count; |
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writefds.fd_count = write_count; |
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exceptfds.fd_count = except_count; |
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/* Call select */ |
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if ((result = select(0 , &readfds, &writefds, &exceptfds, tv)) |
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== SOCKET_ERROR) { |
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/* Bad error - this should not happen frequently */ |
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/* Iterate over sockets and call select() on each separately */ |
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FD_SET errreadfds, errwritefds, errexceptfds; |
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readfds.fd_count = 0; |
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writefds.fd_count = 0; |
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exceptfds.fd_count = 0; |
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for (i = 0; i < numfds; i++) { |
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/* prepare select structures for the i-th socket */ |
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errreadfds.fd_count = 0; |
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errwritefds.fd_count = 0; |
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if (fds[i].events & sun_nio_ch_PollArrayWrapper_POLLIN) { |
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errreadfds.fd_array[0] = fds[i].fd; |
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errreadfds.fd_count = 1; |
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} |
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if (fds[i].events & (sun_nio_ch_PollArrayWrapper_POLLOUT | |
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sun_nio_ch_PollArrayWrapper_POLLCONN)) |
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{ |
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errwritefds.fd_array[0] = fds[i].fd; |
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errwritefds.fd_count = 1; |
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} |
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errexceptfds.fd_array[0] = fds[i].fd; |
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errexceptfds.fd_count = 1; |
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/* call select on the i-th socket */ |
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if (select(0, &errreadfds, &errwritefds, &errexceptfds, &zerotime) |
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== SOCKET_ERROR) { |
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/* This socket causes an error. Add it to exceptfds set */ |
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exceptfds.fd_array[exceptfds.fd_count] = fds[i].fd; |
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exceptfds.fd_count++; |
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} else { |
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/* This socket does not cause an error. Process result */ |
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if (errreadfds.fd_count == 1) { |
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readfds.fd_array[readfds.fd_count] = fds[i].fd; |
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readfds.fd_count++; |
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} |
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if (errwritefds.fd_count == 1) { |
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writefds.fd_array[writefds.fd_count] = fds[i].fd; |
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writefds.fd_count++; |
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} |
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if (errexceptfds.fd_count == 1) { |
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exceptfds.fd_array[exceptfds.fd_count] = fds[i].fd; |
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exceptfds.fd_count++; |
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} |
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} |
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} |
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} |
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/* Return selected sockets. */ |
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/* Each Java array consists of sockets count followed by sockets list */ |
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#ifdef _WIN64 |
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resultbuf[0] = readfds.fd_count; |
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for (i = 0; i < (int)readfds.fd_count; i++) { |
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resultbuf[i + 1] = (int)readfds.fd_array[i]; |
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} |
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(*env)->SetIntArrayRegion(env, returnReadFds, 0, |
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readfds.fd_count + 1, resultbuf); |
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resultbuf[0] = writefds.fd_count; |
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for (i = 0; i < (int)writefds.fd_count; i++) { |
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resultbuf[i + 1] = (int)writefds.fd_array[i]; |
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} |
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(*env)->SetIntArrayRegion(env, returnWriteFds, 0, |
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writefds.fd_count + 1, resultbuf); |
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resultbuf[0] = exceptfds.fd_count; |
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for (i = 0; i < (int)exceptfds.fd_count; i++) { |
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resultbuf[i + 1] = (int)exceptfds.fd_array[i]; |
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} |
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(*env)->SetIntArrayRegion(env, returnExceptFds, 0, |
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exceptfds.fd_count + 1, resultbuf); |
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#else |
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(*env)->SetIntArrayRegion(env, returnReadFds, 0, |
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readfds.fd_count + 1, (jint *)&readfds); |
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(*env)->SetIntArrayRegion(env, returnWriteFds, 0, |
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writefds.fd_count + 1, (jint *)&writefds); |
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(*env)->SetIntArrayRegion(env, returnExceptFds, 0, |
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exceptfds.fd_count + 1, (jint *)&exceptfds); |
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#endif |
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return 0; |
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} |
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JNIEXPORT void JNICALL |
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Java_sun_nio_ch_WindowsSelectorImpl_setWakeupSocket0(JNIEnv *env, jclass this, |
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jint scoutFd) |
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{ |
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/* Write one byte into the pipe */ |
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const char byte = 1; |
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send(scoutFd, &byte, 1, 0); |
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} |
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JNIEXPORT void JNICALL |
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Java_sun_nio_ch_WindowsSelectorImpl_resetWakeupSocket0(JNIEnv *env, jclass this, |
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jint scinFd) |
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{ |
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char bytes[WAKEUP_SOCKET_BUF_SIZE]; |
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long bytesToRead; |
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/* Drain socket */ |
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/* Find out how many bytes available for read */ |
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ioctlsocket (scinFd, FIONREAD, &bytesToRead); |
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if (bytesToRead == 0) { |
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return; |
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} |
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/* Prepare corresponding buffer if needed, and then read */ |
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if (bytesToRead > WAKEUP_SOCKET_BUF_SIZE) { |
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char* buf = (char*)malloc(bytesToRead); |
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recv(scinFd, buf, bytesToRead, 0); |
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free(buf); |
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} else { |
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recv(scinFd, bytes, WAKEUP_SOCKET_BUF_SIZE, 0); |
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} |
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} |
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JNIEXPORT jboolean JNICALL |
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Java_sun_nio_ch_WindowsSelectorImpl_discardUrgentData(JNIEnv* env, jobject this, |
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jint s) |
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{ |
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char data[8]; |
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jboolean discarded = JNI_FALSE; |
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int n; |
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do { |
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n = recv(s, (char*)&data, sizeof(data), MSG_OOB); |
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if (n > 0) { |
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discarded = JNI_TRUE; |
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} |
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} while (n > 0); |
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return discarded; |
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} |