Przemyslaw Szczepaniak | 0f7f0c9 | 2015-07-23 09:40:38 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2001, 2010, 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 "jni.h" |
| 27 | #include "jni_util.h" |
| 28 | #include "jvm.h" |
| 29 | #include "jlong.h" |
| 30 | #include "java_nio_MappedByteBuffer.h" |
| 31 | #include <sys/mman.h> |
| 32 | #include <stddef.h> |
| 33 | #include <stdlib.h> |
| 34 | |
| 35 | #include "JNIHelp.h" |
| 36 | |
| 37 | #define NATIVE_METHOD(className, functionName, signature) \ |
| 38 | { #functionName, signature, (void*)(Java_java_nio_ ## className ## _ ## functionName) } |
| 39 | |
| 40 | JNIEXPORT jboolean JNICALL |
| 41 | Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address, |
| 42 | jlong len, jint numPages) |
| 43 | { |
| 44 | jboolean loaded = JNI_TRUE; |
| 45 | int result = 0; |
| 46 | int i = 0; |
| 47 | void *a = (void *) jlong_to_ptr(address); |
| 48 | #ifdef __linux__ |
| 49 | unsigned char *vec = (unsigned char *)malloc(numPages * sizeof(char)); |
| 50 | #else |
| 51 | char *vec = (char *)malloc(numPages * sizeof(char)); |
| 52 | #endif |
| 53 | |
| 54 | if (vec == NULL) { |
| 55 | JNU_ThrowOutOfMemoryError(env, NULL); |
| 56 | return JNI_FALSE; |
| 57 | } |
| 58 | |
| 59 | result = mincore(a, (size_t)len, vec); |
| 60 | if (result == -1) { |
| 61 | JNU_ThrowIOExceptionWithLastError(env, "mincore failed"); |
| 62 | free(vec); |
| 63 | return JNI_FALSE; |
| 64 | } |
| 65 | |
| 66 | for (i=0; i<numPages; i++) { |
| 67 | if (vec[i] == 0) { |
| 68 | loaded = JNI_FALSE; |
| 69 | break; |
| 70 | } |
| 71 | } |
| 72 | free(vec); |
| 73 | return loaded; |
| 74 | } |
| 75 | |
| 76 | |
| 77 | JNIEXPORT void JNICALL |
| 78 | Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address, |
| 79 | jlong len) |
| 80 | { |
| 81 | char *a = (char *)jlong_to_ptr(address); |
| 82 | int result = madvise((caddr_t)a, (size_t)len, MADV_WILLNEED); |
| 83 | if (result == -1) { |
| 84 | JNU_ThrowIOExceptionWithLastError(env, "madvise failed"); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | |
| 89 | JNIEXPORT void JNICALL |
| 90 | Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo, |
| 91 | jlong address, jlong len) |
| 92 | { |
| 93 | void* a = (void *)jlong_to_ptr(address); |
| 94 | int result = msync(a, (size_t)len, MS_SYNC); |
| 95 | if (result == -1) { |
| 96 | JNU_ThrowIOExceptionWithLastError(env, "msync failed"); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | |
| 101 | static JNINativeMethod gMethods[] = { |
| 102 | NATIVE_METHOD(MappedByteBuffer, isLoaded0, "(JJI)Z"), |
| 103 | NATIVE_METHOD(MappedByteBuffer, load0, "(JJ)V"), |
| 104 | NATIVE_METHOD(MappedByteBuffer, force0, "(Ljava/io/FileDescriptor;JJ)V"), |
| 105 | }; |
| 106 | |
| 107 | void register_java_nio_MappedByteBuffer(JNIEnv* env) { |
| 108 | jniRegisterNativeMethods(env, "java/nio/MappedByteBuffer", gMethods, NELEM(gMethods)); |
| 109 | } |