| /* |
| * Copyright (c) 2001, 2010, 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 "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "jlong.h" |
| #include <sys/mman.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| |
| #include "JNIHelp.h" |
| |
| #define NATIVE_METHOD(className, functionName, signature) \ |
| { #functionName, signature, (void*)(Java_java_nio_ ## className ## _ ## functionName) } |
| |
| JNIEXPORT jboolean JNICALL |
| Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address, |
| jlong len, jint numPages) |
| { |
| jboolean loaded = JNI_TRUE; |
| int result = 0; |
| int i = 0; |
| void *a = (void *) jlong_to_ptr(address); |
| #ifdef __linux__ |
| unsigned char *vec = (unsigned char *)malloc(numPages * sizeof(char)); |
| #else |
| char *vec = (char *)malloc(numPages * sizeof(char)); |
| #endif |
| |
| if (vec == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return JNI_FALSE; |
| } |
| |
| result = mincore(a, (size_t)len, vec); |
| if (result == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "mincore failed"); |
| free(vec); |
| return JNI_FALSE; |
| } |
| |
| for (i=0; i<numPages; i++) { |
| if (vec[i] == 0) { |
| loaded = JNI_FALSE; |
| break; |
| } |
| } |
| free(vec); |
| return loaded; |
| } |
| |
| |
| JNIEXPORT void JNICALL |
| Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address, |
| jlong len) |
| { |
| char *a = (char *)jlong_to_ptr(address); |
| int result = madvise((caddr_t)a, (size_t)len, MADV_WILLNEED); |
| if (result == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "madvise failed"); |
| } |
| } |
| |
| |
| JNIEXPORT void JNICALL |
| Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo, |
| jlong address, jlong len) |
| { |
| void* a = (void *)jlong_to_ptr(address); |
| int result = msync(a, (size_t)len, MS_SYNC); |
| if (result == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "msync failed"); |
| } |
| } |
| |
| |
| static JNINativeMethod gMethods[] = { |
| NATIVE_METHOD(MappedByteBuffer, isLoaded0, "(JJI)Z"), |
| NATIVE_METHOD(MappedByteBuffer, load0, "(JJ)V"), |
| NATIVE_METHOD(MappedByteBuffer, force0, "(Ljava/io/FileDescriptor;JJ)V"), |
| }; |
| |
| void register_java_nio_MappedByteBuffer(JNIEnv* env) { |
| jniRegisterNativeMethods(env, "java/nio/MappedByteBuffer", gMethods, NELEM(gMethods)); |
| } |