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 <sys/mman.h>
31 #include <stddef.h>
32 #include <stdlib.h>
33
34 #include <nativehelper/JNIHelp.h>
35
36 #define NATIVE_METHOD(className, functionName, signature) \
37 { #functionName, signature, (void*)(Java_java_nio_ ## className ## _ ## functionName) }
38
39 JNIEXPORT jboolean JNICALL
Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv * env,jobject obj,jlong address,jlong len,jint numPages)40 Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address,
41 jlong len, jint numPages)
42 {
43 // BEGIN Android-added: Fuchsia holds all pages in memory. http://b/119503290
44 #if defined(__Fuchsia__)
45 return JNI_TRUE;
46 #else
47 // END Android-added: Fuchsia holds all pages in memory. http://b/119503290
48 jboolean loaded = JNI_TRUE;
49 int result = 0;
50 int i = 0;
51 void *a = (void *) jlong_to_ptr(address);
52 #ifdef __linux__
53 unsigned char *vec = (unsigned char *)malloc(numPages * sizeof(char));
54 #else
55 char *vec = (char *)malloc(numPages * sizeof(char));
56 #endif
57
58 if (vec == NULL) {
59 JNU_ThrowOutOfMemoryError(env, NULL);
60 return JNI_FALSE;
61 }
62
63 result = mincore(a, (size_t)len, vec);
64 if (result == -1) {
65 JNU_ThrowIOExceptionWithLastError(env, "mincore failed");
66 free(vec);
67 return JNI_FALSE;
68 }
69
70 for (i=0; i<numPages; i++) {
71 if (vec[i] == 0) {
72 loaded = JNI_FALSE;
73 break;
74 }
75 }
76 free(vec);
77 return loaded;
78 // Android-added: Fuchsia holds all pages in memory. http://b/119503290
79 #endif
80 }
81
82
83 JNIEXPORT void JNICALL
Java_java_nio_MappedByteBuffer_load0(JNIEnv * env,jobject obj,jlong address,jlong len)84 Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address,
85 jlong len)
86 {
87 char *a = (char *)jlong_to_ptr(address);
88 int result = madvise((caddr_t)a, (size_t)len, MADV_WILLNEED);
89 if (result == -1) {
90 JNU_ThrowIOExceptionWithLastError(env, "madvise failed");
91 }
92 }
93
94
95 JNIEXPORT void JNICALL
Java_java_nio_MappedByteBuffer_force0(JNIEnv * env,jobject obj,jobject fdo,jlong address,jlong len)96 Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo,
97 jlong address, jlong len)
98 {
99 void* a = (void *)jlong_to_ptr(address);
100 int result = msync(a, (size_t)len, MS_SYNC);
101 if (result == -1) {
102 JNU_ThrowIOExceptionWithLastError(env, "msync failed");
103 }
104 }
105
106
107 static JNINativeMethod gMethods[] = {
108 NATIVE_METHOD(MappedByteBuffer, isLoaded0, "(JJI)Z"),
109 NATIVE_METHOD(MappedByteBuffer, load0, "(JJ)V"),
110 NATIVE_METHOD(MappedByteBuffer, force0, "(Ljava/io/FileDescriptor;JJ)V"),
111 };
112
register_java_nio_MappedByteBuffer(JNIEnv * env)113 void register_java_nio_MappedByteBuffer(JNIEnv* env) {
114 jniRegisterNativeMethods(env, "java/nio/MappedByteBuffer", gMethods, NELEM(gMethods));
115 }
116