| /* |
| * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.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 <stdlib.h> |
| |
| JNIEXPORT jboolean JNICALL |
| Java_java_nio_MappedByteBuffer_isLoaded0(JNIEnv *env, jobject obj, jlong address, |
| jlong len, jint numPages) |
| { |
| jboolean loaded = JNI_FALSE; |
| /* Information not available? |
| MEMORY_BASIC_INFORMATION info; |
| void *a = (void *) jlong_to_ptr(address); |
| int result = VirtualQuery(a, &info, (DWORD)len); |
| */ |
| return loaded; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_java_nio_MappedByteBuffer_load0(JNIEnv *env, jobject obj, jlong address, |
| jlong len) |
| { |
| // no madvise available |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_java_nio_MappedByteBuffer_force0(JNIEnv *env, jobject obj, jobject fdo, |
| jlong address, jlong len) |
| { |
| void *a = (void *) jlong_to_ptr(address); |
| BOOL result; |
| int retry; |
| |
| /* |
| * FlushViewOfFile can fail with ERROR_LOCK_VIOLATION if the memory |
| * system is writing dirty pages to disk. As there is no way to |
| * synchronize the flushing then we retry a limited number of times. |
| */ |
| retry = 0; |
| do { |
| result = FlushViewOfFile(a, (DWORD)len); |
| if ((result != 0) || (GetLastError() != ERROR_LOCK_VIOLATION)) |
| break; |
| retry++; |
| } while (retry < 3); |
| |
| /** |
| * FlushViewOfFile only initiates the writing of dirty pages to disk |
| * so we have to call FlushFileBuffers to and ensure they are written. |
| */ |
| if (result != 0) { |
| // by right, the jfieldID initialization should be in a static |
| // initializer but we do it here instead to avoiding needing to |
| // load nio.dll during startup. |
| static jfieldID handle_fdID; |
| HANDLE h; |
| if (handle_fdID == NULL) { |
| jclass clazz = (*env)->FindClass(env, "java/io/FileDescriptor"); |
| CHECK_NULL(clazz); //exception thrown |
| handle_fdID = (*env)->GetFieldID(env, clazz, "handle", "J"); |
| CHECK_NULL(handle_fdID); |
| } |
| h = jlong_to_ptr((*env)->GetLongField(env, fdo, handle_fdID)); |
| result = FlushFileBuffers(h); |
| if (result == 0 && GetLastError() == ERROR_ACCESS_DENIED) { |
| // read-only mapping |
| result = 1; |
| } |
| } |
| |
| if (result == 0) { |
| JNU_ThrowIOExceptionWithLastError(env, "Flush failed"); |
| } |
| } |