1 /* 2 * Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include <sys/types.h> 27 #include <string.h> 28 #include "jni.h" 29 #include "jni_util.h" 30 #include "jvm.h" 31 #include "jlong.h" 32 #include "nio_util.h" 33 #include <nativehelper/JNIHelp.h> 34 35 #ifdef __linux__ 36 #include <pthread.h> 37 #include <sys/signal.h> 38 // Android-changed: Bionic (and AsynchronousCloseMonitor) expects libcore to use 39 // __SIGRTMIN + 2, not __SIGRTMAX - 2 40 /* Also defined in net/linux_close.c */ 41 #define INTERRUPT_SIGNAL (__SIGRTMIN + 2) 42 #elif __solaris__ 43 #include <thread.h> 44 #include <signal.h> 45 #define INTERRUPT_SIGNAL (SIGRTMAX - 2) 46 #elif _ALLBSD_SOURCE 47 #include <pthread.h> 48 #include <signal.h> 49 /* Also defined in net/bsd_close.c */ 50 #define INTERRUPT_SIGNAL SIGIO 51 #else 52 #error "missing platform-specific definition here" 53 #endif 54 55 #define NATIVE_METHOD(className, functionName, signature) \ 56 { #functionName, signature, (void*)(className ## _ ## functionName) } 57 58 static void 59 nullHandler(int sig) 60 { 61 } 62 63 static void NativeThread_init(JNIEnv *env) 64 { 65 /* Install the null handler for INTERRUPT_SIGNAL. This might overwrite the 66 * handler previously installed by java/net/linux_close.c, but that's okay 67 * since neither handler actually does anything. We install our own 68 * handler here simply out of paranoia; ultimately the two mechanisms 69 * should somehow be unified, perhaps within the VM. 70 */ 71 72 sigset_t ss; 73 struct sigaction sa, osa; 74 sa.sa_handler = nullHandler; 75 sa.sa_flags = 0; 76 sigemptyset(&sa.sa_mask); 77 if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0) 78 JNU_ThrowIOExceptionWithLastError(env, "sigaction"); 79 } 80 81 JNIEXPORT jlong JNICALL 82 NativeThread_current(JNIEnv *env, jclass cl) 83 { 84 #ifdef __solaris__ 85 return (jlong)thr_self(); 86 #else 87 return (jlong)pthread_self(); 88 #endif 89 } 90 91 JNIEXPORT void JNICALL 92 NativeThread_signal(JNIEnv *env, jclass cl, jlong thread) 93 { 94 int ret; 95 #ifdef __solaris__ 96 ret = thr_kill((thread_t)thread, INTERRUPT_SIGNAL); 97 #else 98 ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL); 99 #endif 100 if (ret != 0) 101 JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed"); 102 } 103 104 static JNINativeMethod gMethods[] = { 105 NATIVE_METHOD(NativeThread, current, "()J"), 106 NATIVE_METHOD(NativeThread, signal, "(J)V"), 107 }; 108 109 void register_sun_nio_ch_NativeThread(JNIEnv* env) { 110 jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods)); 111 NativeThread_init(env); 112 } 113
