1 /*
   2  * Copyright (c) 2005, 2015, 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  * A class to manage queueing of messages for IPC
  28  */
  29 
  30 #include <windows.h>
  31 
  32 #ifndef __AccessBridgeMessageQueue_H__
  33 #define __AccessBridgeMessageQueue_H__
  34 
  35 
  36 enum QueueReturns {
  37     cQueueEmpty = 0,
  38     cMoreMessages = 1,
  39     cQueueInUse,
  40     cElementPushedOK,
  41     cQueueFull,
  42     cQueueOK,
  43     cQueueBroken                // shouldn't ever happen!
  44 };
  45 
  46 class AccessBridgeQueueElement {
  47     friend class AccessBridgeMessageQueue;
  48     friend class WinAccessBridge;
  49     char *buffer;
  50     int bufsize;
  51     AccessBridgeQueueElement *next;
  52     AccessBridgeQueueElement *previous;
  53 
  54 public:
  55     AccessBridgeQueueElement(char *buf, int size);
  56     ~AccessBridgeQueueElement();
  57 };
  58 
  59 class AccessBridgeMessageQueue {
  60     BOOL queueLocked;
  61     BOOL queueRemoveLocked;
  62     AccessBridgeQueueElement *start;
  63     AccessBridgeQueueElement *end;
  64     int size;
  65 
  66 public:
  67     AccessBridgeMessageQueue();
  68     ~AccessBridgeMessageQueue();
  69 
  70     int getEventsWaiting();
  71 
  72     QueueReturns add(AccessBridgeQueueElement *element);
  73     QueueReturns remove(AccessBridgeQueueElement **element);
  74     QueueReturns setRemoveLock(BOOL removeLockSetting);
  75     BOOL getRemoveLockSetting();
  76 };
  77 
  78 
  79 #endif