src/java.base/unix/native/libnio/ch/NativeThread.c
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 46862 jdk/src/java.base/unix/native/libnio/ch/NativeThread.c@cb4b080576fa
child 51878 511a9946f83e
permissions -rw-r--r--
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/*
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 * Copyright (c) 2002, 2016, 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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#include <sys/types.h>
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#include <string.h>
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#include "jni.h"
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#include "jni_util.h"
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#include "jvm.h"
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#include "jlong.h"
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#include "sun_nio_ch_NativeThread.h"
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#include "nio_util.h"
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#include <signal.h>
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#ifdef __linux__
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  #include <pthread.h>
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  /* Also defined in net/linux_close.c */
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  #define INTERRUPT_SIGNAL (__SIGRTMAX - 2)
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#elif _AIX
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  #include <pthread.h>
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  /* Also defined in net/aix_close.c */
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  #define INTERRUPT_SIGNAL (SIGRTMAX - 1)
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#elif __solaris__
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  #include <thread.h>
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  #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
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#elif _ALLBSD_SOURCE
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  #include <pthread.h>
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  /* Also defined in net/bsd_close.c */
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  #define INTERRUPT_SIGNAL SIGIO
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#else
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  #error "missing platform-specific definition here"
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#endif
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static void
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nullHandler(int sig)
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{
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}
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JNIEXPORT void JNICALL
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Java_sun_nio_ch_NativeThread_init(JNIEnv *env, jclass cl)
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{
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    /* Install the null handler for INTERRUPT_SIGNAL.  This might overwrite the
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     * handler previously installed by <platform>_close.c, but that's okay
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     * since neither handler actually does anything.  We install our own
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     * handler here simply out of paranoia; ultimately the two mechanisms
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     * should somehow be unified, perhaps within the VM.
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     */
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    sigset_t ss;
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    struct sigaction sa, osa;
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    sa.sa_handler = nullHandler;
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    sa.sa_flags = 0;
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    sigemptyset(&sa.sa_mask);
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    if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0)
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        JNU_ThrowIOExceptionWithLastError(env, "sigaction");
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}
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JNIEXPORT jlong JNICALL
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Java_sun_nio_ch_NativeThread_current(JNIEnv *env, jclass cl)
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{
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#ifdef __solaris__
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    return (jlong)thr_self();
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#else
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    return (jlong)pthread_self();
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#endif
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}
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JNIEXPORT void JNICALL
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Java_sun_nio_ch_NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)
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{
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    int ret;
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    ret = thr_kill((thread_t)thread, INTERRUPT_SIGNAL);
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#else
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    ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL);
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#endif
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#ifdef MACOSX
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    if (ret != 0 && ret != ESRCH)
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#else
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    if (ret != 0)
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#endif
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        JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
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}