8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/windows/native/libnio/MappedByteBuffer.c

@@ -0,0 +1,101 @@
+/*
+ * 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");
+    }
+}