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 JNIEXPORT jboolean JNICALL 36 Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address, 37 jlong len, jint numPages) 38 { 39 jboolean loaded = JNI_TRUE; 40 int result = 0; 41 int i = 0; 42 void *a = (void *) jlong_to_ptr(address); 43 #ifdef __linux__ 44 unsigned char *vec = (unsigned char *)malloc(numPages * sizeof(char)); 45 #else 46 char *vec = (char *)malloc(numPages * sizeof(char)); 47 #endif 48 49 if (vec == NULL) { 50 JNU_ThrowOutOfMemoryError(env, NULL); 51 return JNI_FALSE; 52 } 53 54 result = mincore(a, (size_t)len, vec); 55 if (result == -1) { 56 JNU_ThrowIOExceptionWithLastError(env, "mincore failed"); 57 free(vec); 58 return JNI_FALSE; 59 } 60 61 for (i=0; i<numPages; i++) { 62 if (vec[i] == 0) { 63 loaded = JNI_FALSE; 64 break; 65 } 66 } 67 free(vec); 68 return loaded; 69 } 70 71 72 JNIEXPORT void JNICALL 73 Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address, 74 jlong len) 75 { 76 char *a = (char *)jlong_to_ptr(address); 77 int result = madvise((caddr_t)a, (size_t)len, MADV_WILLNEED); 78 if (result == -1) { 79 JNU_ThrowIOExceptionWithLastError(env, "madvise failed"); 80 } 81 } 82 83 84 JNIEXPORT void JNICALL 85 Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo, 86 jlong address, jlong len) 87 { 88 void* a = (void *)jlong_to_ptr(address); 89 int result = msync(a, (size_t)len, MS_SYNC); 90 if (result == -1) { 91 JNU_ThrowIOExceptionWithLastError(env, "msync failed"); 92 } 93 }