java/nio/MappedByteBuffer.c

0N/A/*
2362N/A * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.  Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
0N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
2362N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
2362N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
0N/A * or visit www.oracle.com if you need additional information or have any
0N/A * questions.
0N/A */
0N/A
0N/A#include "jni.h"
0N/A#include "jni_util.h"
0N/A#include "jvm.h"
0N/A#include "jlong.h"
0N/A#include "java_nio_MappedByteBuffer.h"
0N/A#include <sys/mman.h>
0N/A#include <stddef.h>
0N/A#include <stdlib.h>
0N/A
0N/AJNIEXPORT jboolean JNICALL
0N/AJava_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address,
0N/A                                         jlong len, jint numPages)
0N/A{
0N/A    jboolean loaded = JNI_TRUE;
0N/A    int result = 0;
0N/A    int i = 0;
0N/A    void *a = (void *) jlong_to_ptr(address);
0N/A#ifdef __linux__
0N/A    unsigned char *vec = (unsigned char *)malloc(numPages * sizeof(char));
0N/A#else
0N/A    char *vec = (char *)malloc(numPages * sizeof(char));
0N/A#endif
0N/A
0N/A    if (vec == NULL) {
0N/A        JNU_ThrowOutOfMemoryError(env, NULL);
0N/A        return JNI_FALSE;
0N/A    }
0N/A
0N/A    result = mincore(a, (size_t)len, vec);
0N/A    if (result == -1) {
0N/A        JNU_ThrowIOExceptionWithLastError(env, "mincore failed");
0N/A        free(vec);
0N/A        return JNI_FALSE;
0N/A    }
0N/A
0N/A    for (i=0; i<numPages; i++) {
0N/A        if (vec[i] == 0) {
0N/A            loaded = JNI_FALSE;
0N/A            break;
0N/A        }
0N/A    }
0N/A    free(vec);
0N/A    return loaded;
0N/A}
0N/A
0N/A
0N/AJNIEXPORT void JNICALL
0N/AJava_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address,
0N/A                                     jlong len)
0N/A{
0N/A    char *a = (char *)jlong_to_ptr(address);
0N/A    int result = madvise((caddr_t)a, (size_t)len, MADV_WILLNEED);
0N/A    if (result == -1) {
0N/A        JNU_ThrowIOExceptionWithLastError(env, "madvise failed");
0N/A    }
0N/A}
0N/A
0N/A
0N/AJNIEXPORT void JNICALL
0N/AJava_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo,
0N/A                                      jlong address, jlong len)
0N/A{
0N/A    void* a = (void *)jlong_to_ptr(address);
0N/A    int result = msync(a, (size_t)len, MS_SYNC);
0N/A    if (result == -1) {
0N/A        JNU_ThrowIOExceptionWithLastError(env, "msync failed");
0N/A    }
0N/A}
0N/A