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8253478: (se) epoll Selector should use eventfd for wakeup instead of pipe

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2021-01-21 21:36:19 +00:00
parent 34eb8b344d
commit a8073efeed
4 changed files with 200 additions and 14 deletions
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54
src/java.base/linux/native/libnio/ch/EventFD.c Normal file
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/*
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <sys/eventfd.h>
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include "nio.h"
#include "nio_util.h"
#include "sun_nio_ch_EventFD.h"
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EventFD_eventfd0(JNIEnv *env, jclass klazz)
{
int efd = eventfd((uint64_t)0, 0);
if (efd == -1) {
JNU_ThrowIOExceptionWithLastError(env, "eventfd failed");
return IOS_THROWN;
}
return efd;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EventFD_set0(JNIEnv *env, jclass klazz, jint efd)
{
long one = 1L;
return convertReturnVal(env, write(efd, (void*)&one, sizeof(long)),
JNI_FALSE);
}