| /* |
| * Copyright (c) 2005, 2015, 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. |
| */ |
| |
| /* |
| * A class to manage queueing of messages for IPC |
| */ |
| |
| #include "AccessBridgeDebug.h" |
| #include "AccessBridgeMessageQueue.h" |
| #include "AccessBridgePackages.h" // for debugging only |
| #include <windows.h> |
| #include <malloc.h> |
| |
| DEBUG_CODE(extern HWND theDialogWindow); |
| extern "C" { |
| DEBUG_CODE(void AppendToCallInfo(char *s)); |
| } |
| |
| // ------------------- |
| |
| |
| AccessBridgeQueueElement::AccessBridgeQueueElement(char *buf, int size) { |
| bufsize = size; |
| next = (AccessBridgeQueueElement *) 0; |
| previous = (AccessBridgeQueueElement *) 0; |
| buffer = (char *) malloc(bufsize); |
| memcpy(buffer, buf, bufsize); |
| } |
| |
| AccessBridgeQueueElement::~AccessBridgeQueueElement() { |
| // delete buffer; |
| free(buffer); |
| } |
| |
| |
| // ------------------- |
| |
| |
| AccessBridgeMessageQueue::AccessBridgeMessageQueue() { |
| queueLocked = FALSE; |
| queueRemoveLocked = FALSE; |
| start = (AccessBridgeQueueElement *) 0; |
| end = (AccessBridgeQueueElement *) 0; |
| size = 0; |
| } |
| |
| AccessBridgeMessageQueue::~AccessBridgeMessageQueue() { |
| // empty queue, then exit |
| } |
| |
| /** |
| * getEventsWaiting - gets the number of events waiting to fire |
| */ |
| int |
| AccessBridgeMessageQueue::getEventsWaiting() { |
| return size; |
| } |
| |
| /** |
| * add - add an element to the queue, which is locked with semaphores |
| * |
| */ |
| QueueReturns |
| AccessBridgeMessageQueue::add(AccessBridgeQueueElement *element) { |
| PrintDebugString(" in AccessBridgeMessageQueue::add()"); |
| PrintDebugString(" queue size = %d", size); |
| |
| QueueReturns returnVal = cElementPushedOK; |
| if (queueLocked) { |
| PrintDebugString(" queue was locked; returning cQueueInUse!"); |
| return cQueueInUse; |
| } |
| queueLocked = TRUE; |
| { |
| PrintDebugString(" adding element to queue!"); |
| if (end == (AccessBridgeQueueElement *) 0) { |
| if (start == (AccessBridgeQueueElement *) 0 && size == 0) { |
| start = element; |
| end = element; |
| element->previous = (AccessBridgeQueueElement *) 0; |
| element->next = (AccessBridgeQueueElement *) 0; |
| size++; |
| } else { |
| returnVal = cQueueBroken; // bad voodo! |
| } |
| } else { |
| element->previous = end; |
| element->next = (AccessBridgeQueueElement *) 0; |
| end->next = element; |
| end = element; |
| size++; |
| } |
| } |
| queueLocked = FALSE; |
| PrintDebugString(" returning from AccessBridgeMessageQueue::add()"); |
| return returnVal; |
| } |
| |
| |
| /** |
| * remove - remove an element from the queue, which is locked with semaphores |
| * |
| */ |
| QueueReturns |
| AccessBridgeMessageQueue::remove(AccessBridgeQueueElement **element) { |
| PrintDebugString(" in AccessBridgeMessageQueue::remove()"); |
| PrintDebugString(" queue size = %d", size); |
| |
| QueueReturns returnVal = cMoreMessages; |
| if (queueLocked) { |
| PrintDebugString(" queue was locked; returning cQueueInUse!"); |
| return cQueueInUse; |
| } |
| queueLocked = TRUE; |
| { |
| PrintDebugString(" removing element from queue!"); |
| if (size > 0) { |
| if (start != (AccessBridgeQueueElement *) 0) { |
| *element = start; |
| start = start->next; |
| if (start != (AccessBridgeQueueElement *) 0) { |
| start->previous = (AccessBridgeQueueElement *) 0; |
| } else { |
| end = (AccessBridgeQueueElement *) 0; |
| if (size != 1) { |
| returnVal = cQueueBroken; // bad voodo, should only be 1 in this situation |
| } |
| } |
| size--; |
| } else { |
| returnVal = cQueueBroken; // bad voodo! |
| } |
| } else { |
| returnVal = cQueueEmpty; |
| } |
| } |
| queueLocked = FALSE; |
| PrintDebugString(" returning from AccessBridgeMessageQueue::remove()"); |
| return returnVal; |
| } |
| |
| |
| /** |
| * setRemoveLock - set the state of the removeLock (TRUE or FALSE) |
| * |
| */ |
| QueueReturns |
| AccessBridgeMessageQueue::setRemoveLock(BOOL removeLockSetting) { |
| if (queueLocked) { |
| return cQueueInUse; |
| } |
| queueRemoveLocked = removeLockSetting; |
| |
| return cQueueOK; |
| } |
| |
| /** |
| * setRemoveLock - set the state of the removeLock (TRUE or FALSE) |
| * |
| */ |
| BOOL |
| AccessBridgeMessageQueue::getRemoveLockSetting() { |
| return queueRemoveLocked; |
| } |