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
35JNIEXPORT jboolean JNICALL
36Java_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
72JNIEXPORT void JNICALL
73Java_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
84JNIEXPORT void JNICALL
85Java_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}
94