8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/sun/nio/ch/IOVecWrapper.java

@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2000, 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.
+ */
+
+package sun.nio.ch;
+
+import java.nio.ByteBuffer;
+import jdk.internal.ref.CleanerFactory;
+
+
+/**
+ * Manipulates a native array of iovec structs on Solaris:
+ *
+ * typedef struct iovec {
+ *    caddr_t  iov_base;
+      int      iov_len;
+ * } iovec_t;
+ *
+ * @author Mike McCloskey
+ * @since 1.4
+ */
+
+class IOVecWrapper {
+
+    // Miscellaneous constants
+    private static final int BASE_OFFSET = 0;
+    private static final int LEN_OFFSET;
+    private static final int SIZE_IOVEC;
+
+    // The iovec array
+    private final AllocatedNativeObject vecArray;
+
+    // Number of elements in iovec array
+    private final int size;
+
+    // Buffers and position/remaining corresponding to elements in iovec array
+    private final ByteBuffer[] buf;
+    private final int[] position;
+    private final int[] remaining;
+
+    // Shadow buffers for cases when original buffer is substituted
+    private final ByteBuffer[] shadow;
+
+    // Base address of this array
+    final long address;
+
+    // Address size in bytes
+    static int addressSize;
+
+    private static class Deallocator implements Runnable {
+        private final AllocatedNativeObject obj;
+        Deallocator(AllocatedNativeObject obj) {
+            this.obj = obj;
+        }
+        public void run() {
+            obj.free();
+        }
+    }
+
+    // per thread IOVecWrapper
+    private static final ThreadLocal<IOVecWrapper> cached =
+        new ThreadLocal<IOVecWrapper>();
+
+    private IOVecWrapper(int size) {
+        this.size      = size;
+        this.buf       = new ByteBuffer[size];
+        this.position  = new int[size];
+        this.remaining = new int[size];
+        this.shadow    = new ByteBuffer[size];
+        this.vecArray  = new AllocatedNativeObject(size * SIZE_IOVEC, false);
+        this.address   = vecArray.address();
+    }
+
+    static IOVecWrapper get(int size) {
+        IOVecWrapper wrapper = cached.get();
+        if (wrapper != null && wrapper.size < size) {
+            // not big enough; eagerly release memory
+            wrapper.vecArray.free();
+            wrapper = null;
+        }
+        if (wrapper == null) {
+            wrapper = new IOVecWrapper(size);
+            CleanerFactory.cleaner().register(wrapper, new Deallocator(wrapper.vecArray));
+            cached.set(wrapper);
+        }
+        return wrapper;
+    }
+
+    void setBuffer(int i, ByteBuffer buf, int pos, int rem) {
+        this.buf[i] = buf;
+        this.position[i] = pos;
+        this.remaining[i] = rem;
+    }
+
+    void setShadow(int i, ByteBuffer buf) {
+        shadow[i] = buf;
+    }
+
+    ByteBuffer getBuffer(int i) {
+        return buf[i];
+    }
+
+    int getPosition(int i) {
+        return position[i];
+    }
+
+    int getRemaining(int i) {
+        return remaining[i];
+    }
+
+    ByteBuffer getShadow(int i) {
+        return shadow[i];
+    }
+
+    void clearRefs(int i) {
+        buf[i] = null;
+        shadow[i] = null;
+    }
+
+    void putBase(int i, long base) {
+        int offset = SIZE_IOVEC * i + BASE_OFFSET;
+        if (addressSize == 4)
+            vecArray.putInt(offset, (int)base);
+        else
+            vecArray.putLong(offset, base);
+    }
+
+    void putLen(int i, long len) {
+        int offset = SIZE_IOVEC * i + LEN_OFFSET;
+        if (addressSize == 4)
+            vecArray.putInt(offset, (int)len);
+        else
+            vecArray.putLong(offset, len);
+    }
+
+    static {
+        addressSize = Util.unsafe().addressSize();
+        LEN_OFFSET = addressSize;
+        SIZE_IOVEC = (short) (addressSize * 2);
+    }
+}