| /* |
| * Copyright 2001-2005 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "jlong.h" |
| #include "java_nio_MappedByteBuffer.h" |
| #include <sys/mman.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| |
| |
| JNIEXPORT jboolean JNICALL |
| Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, |
| jlong address, jlong len) |
| { |
| jboolean loaded = JNI_TRUE; |
| jint pageSize = sysconf(_SC_PAGESIZE); |
| jint numPages = (len + pageSize - 1) / pageSize; |
| 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 != 0) { |
| free(vec); |
| JNU_ThrowIOExceptionWithLastError(env, "mincore failed"); |
| return JNI_FALSE; |
| } |
| |
| for (i=0; i<numPages; i++) { |
| if (vec[i] == 0) { |
| loaded = JNI_FALSE; |
| break; |
| } |
| } |
| free(vec); |
| return loaded; |
| } |
| |
| |
| JNIEXPORT jint JNICALL |
| Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address, |
| jlong len, jint pageSize) |
| { |
| int pageIncrement = pageSize / sizeof(int); |
| int numPages = (len + pageSize - 1) / pageSize; |
| int *ptr = (int *)jlong_to_ptr(address); |
| int i = 0; |
| int j = 0; |
| int result = madvise((caddr_t)ptr, len, MADV_WILLNEED); |
| |
| /* touch every page */ |
| for (i=0; i<numPages; i++) { |
| j += *((volatile int *)ptr); |
| ptr += pageIncrement; |
| } |
| return j; |
| } |
| |
| |
| JNIEXPORT void JNICALL |
| Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jlong address, |
| jlong len) |
| { |
| jlong pageSize = sysconf(_SC_PAGESIZE); |
| unsigned long lAddress = address; |
| |
| jlong offset = lAddress % pageSize; |
| void *a = (void *) jlong_to_ptr(lAddress - offset); |
| int result = msync(a, (size_t)(len + offset), MS_SYNC); |
| if (result != 0) { |
| JNU_ThrowIOExceptionWithLastError(env, "msync failed"); |
| } |
| } |