--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/windows/native/libjava/ConcurrentPReader_md.c	Wed Dec 03 14:22:58 2014 +0000
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2014, 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 <windows.h>
+
+#include "jni_util.h"
+#include "jlong.h"
+#include "jdk_internal_jimage_concurrent_ConcurrentPReader.h"
+
+static jfieldID handle_fdID;
+
+JNIEXPORT void JNICALL
+Java_jdk_internal_jimage_concurrent_ConcurrentPReader_initIDs(JNIEnv *env, jclass clazz)
+{
+    CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor"));
+    CHECK_NULL(handle_fdID = (*env)->GetFieldID(env, clazz, "handle", "J"));
+}
+
+JNIEXPORT jint JNICALL
+Java_jdk_internal_jimage_concurrent_ConcurrentPReader_pread(JNIEnv *env, jclass clazz,
+                                                            jobject fdo, jlong address,
+                                                            jint len, jlong offset)
+{
+    OVERLAPPED ov;
+    DWORD nread;
+    BOOL result;
+
+    jlong handle = (*env)->GetLongField(env, fdo, handle_fdID);
+    void *buf = (void *)jlong_to_ptr(address);
+
+    ZeroMemory(&ov, sizeof(ov));
+    ov.Offset = (DWORD)offset;
+    ov.OffsetHigh = (DWORD)(offset >> 32);
+
+    result = ReadFile(handle, (LPVOID)buf, len, &nread, &ov);
+    if (result == 0) {
+        JNU_ThrowIOExceptionWithLastError(env, "ReadFile failed");
+    }
+
+    return nread;
+}
+