1 /*
   2  *  Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  *  This code is free software; you can redistribute it and/or modify it
   6  *  under the terms of the GNU General Public License version 2 only, as
   7  *  published by the Free Software Foundation.  Oracle designates this
   8  *  particular file as subject to the "Classpath" exception as provided
   9  *  by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  *  This code is distributed in the hope that it will be useful, but WITHOUT
  12  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  *  version 2 for more details (a copy is included in the LICENSE file that
  15  *  accompanied this code).
  16  *
  17  *  You should have received a copy of the GNU General Public License version
  18  *  2 along with this work; if not, write to the Free Software Foundation,
  19  *  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *   Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  *  or visit www.oracle.com if you need additional information or have any
  23  *  questions.
  24  *
  25  */
  26 
  27 package jdk.internal.clang;
  28 
  29 import jdk.incubator.foreign.MemorySegment;
  30 
  31 import java.util.LinkedHashSet;
  32 import java.util.Set;
  33 
  34 class AllocationScope implements AutoCloseable {
  35     private final Set<MemorySegment> segments = new LinkedHashSet<>();
  36 
  37     MemorySegment track(MemorySegment segment) {
  38         if (!segments.add(segment)) {
  39             throw new IllegalArgumentException("Attempt to track a memory segment twice");
  40         }
  41         return segment;
  42     }
  43 
  44     void forget(MemorySegment segment) {
  45         if (!segments.remove(segment)) {
  46             throw new IllegalArgumentException("Attempt to forget a memory segment not tracked by this scope");
  47         }
  48     }
  49 
  50     @Override
  51     public void close() {
  52         var currentThread = Thread.currentThread();
  53         segments.stream()
  54                 .filter(ms -> ms.owner() == currentThread)
  55                 .forEach(MemorySegment::close);
  56     }
  57 }