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BEGIN LICENSE BLOCK ***** Version: EPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Eclipse Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Copyright (C) 2011 Wayne Meissner Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the EPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the EPL, the GPL or the LGPL. END LICENSE BLOCK ***
 package org.jruby.ext.ffi.jffi;
 import org.jruby.Ruby;
 import java.util.Map;
 final class TransientNativeMemoryIO extends BoundedNativeMemoryIO {
Keeps strong references to the memory bucket until cleanup
     private static final Map<MagazineBooleanreferenceSet = new ConcurrentHashMap<MagazineBoolean>();
     private static final ThreadLocal<Reference<Magazine>> currentMagazine = new ThreadLocal<Reference<Magazine>>();
     private static final int PAGES_PER_MAGAZINE = 1;
     private final Object sentinel;

Allocates native memory, aligned to a minimum boundary.

runtime The Ruby runtime
size The number of bytes to allocate
align The minimum alignment of the memory
clear Whether the memory should be cleared (zeroed)
A new org.jruby.ext.ffi.AllocatedDirectMemoryIO
     static MemoryIO allocateAligned(Ruby runtimeint sizeint alignboolean clear) {
         if (size > 1024) {
             return AllocatedNativeMemoryIO.allocateAligned(runtimesizealignclear);
         Reference<MagazinemagazineReference = .get();
         Magazine magazine = magazineReference != null ? magazineReference.get() : null;
         Object sentinel = magazine != null ? magazine.sentinel() : null;
         long address;
         if (sentinel == null || (address = magazine.allocate(sizealign)) == 0) {
             PageManager pm = PageManager.getInstance();
             long memory;
             int pageCount = ;
             do {
                 memory = pm.allocatePages(pageCount. | .);
                 if (memory != 0L && memory != -1L) {
                 // No available pages; trigger a full GC to reclaim some memory
             } while (true);
             .put(magazine = new Magazine(sentinel = new Object(), pmmemorypageCount), .);
             .set(new SoftReference<Magazine>(magazine));
             address = magazine.allocate(sizealign);
         return new TransientNativeMemoryIO(runtimesentineladdresssize);
     private TransientNativeMemoryIO(Ruby runtimeObject sentinellong addressint size) {
         this. = sentinel;
     private static long align(long offsetlong align) {
         return (offset + align - 1L) & ~(align - 1L);

Holder for a group of memory allocations.
    private static final class Magazine extends PhantomReferenceReaper<Objectimplements Runnable {
        private final WeakReference<Objectweakref;
        private final PageManager pm;
        private final long page;
        private final long end;
        private final int pageCount;
        private long memory;
        Magazine(Object sentinelPageManager pmlong pageint pageCount) {
            this. = new WeakReference<Object>(sentinel);
            this. = pm;
            this. = this. = page;
            this. = pageCount;
            this. = this. + (pm.pageSize() * pageCount);
        Object sentinel() {
            return .get();
        long allocate(int sizeint align) {
            long address = align(this.align);
            if (address + size <= ) {
                 = address + size;
                return address;
            return 0L;
        public final void run() {
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