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 "AccessBridgeDebug.h"
31 #include "AccessBridgeMessageQueue.h"
32 #include "AccessBridgePackages.h" // for debugging only
33 #include <windows.h>
34 #include <malloc.h>
35
36 DEBUG_CODE(extern HWND theDialogWindow);
37 extern "C" {
38 DEBUG_CODE(void AppendToCallInfo(char *s));
39 }
40
41 // -------------------
42
43
44 AccessBridgeQueueElement::AccessBridgeQueueElement(char *buf, int size) {
45 bufsize = size;
46 next = (AccessBridgeQueueElement *) 0;
47 previous = (AccessBridgeQueueElement *) 0;
48 buffer = (char *) malloc(bufsize);
49 memcpy(buffer, buf, bufsize);
50 }
51
52 AccessBridgeQueueElement::~AccessBridgeQueueElement() {
53 // delete buffer;
54 free(buffer);
55 }
56
57
58 // -------------------
59
60
61 AccessBridgeMessageQueue::AccessBridgeMessageQueue() {
62 queueLocked = FALSE;
63 queueRemoveLocked = FALSE;
64 start = (AccessBridgeQueueElement *) 0;
65 end = (AccessBridgeQueueElement *) 0;
66 size = 0;
67 }
68
69 AccessBridgeMessageQueue::~AccessBridgeMessageQueue() {
70 // empty queue, then exit
71 }
72
73 /**
74 * getEventsWaiting - gets the number of events waiting to fire
75 */
76 int
77 AccessBridgeMessageQueue::getEventsWaiting() {
78 return size;
79 }
80
81 /**
82 * add - add an element to the queue, which is locked with semaphores
83 *
84 */
85 QueueReturns
86 AccessBridgeMessageQueue::add(AccessBridgeQueueElement *element) {
87 PrintDebugString(" in AccessBridgeMessageQueue::add()");
88 PrintDebugString(" queue size = %d", size);
89
90 QueueReturns returnVal = cElementPushedOK;
91 if (queueLocked) {
92 PrintDebugString(" queue was locked; returning cQueueInUse!");
93 return cQueueInUse;
94 }
95 queueLocked = TRUE;
96 {
97 PrintDebugString(" adding element to queue!");
98 if (end == (AccessBridgeQueueElement *) 0) {
99 if (start == (AccessBridgeQueueElement *) 0 && size == 0) {
100 start = element;
101 end = element;
102 element->previous = (AccessBridgeQueueElement *) 0;
103 element->next = (AccessBridgeQueueElement *) 0;
104 size++;
105 } else {
106 returnVal = cQueueBroken; // bad voodo!
107 }
108 } else {
109 element->previous = end;
110 element->next = (AccessBridgeQueueElement *) 0;
111 end->next = element;
112 end = element;
113 size++;
114 }
115 }
116 queueLocked = FALSE;
117 PrintDebugString(" returning from AccessBridgeMessageQueue::add()");
118 return returnVal;
119 }
120
121
122 /**
123 * remove - remove an element from the queue, which is locked with semaphores
124 *
125 */
126 QueueReturns
127 AccessBridgeMessageQueue::remove(AccessBridgeQueueElement **element) {
128 PrintDebugString(" in AccessBridgeMessageQueue::remove()");
129 PrintDebugString(" queue size = %d", size);
130
131 QueueReturns returnVal = cMoreMessages;
132 if (queueLocked) {
133 PrintDebugString(" queue was locked; returning cQueueInUse!");
134 return cQueueInUse;
135 }
136 queueLocked = TRUE;
137 {
138 PrintDebugString(" removing element from queue!");
139 if (size > 0) {
140 if (start != (AccessBridgeQueueElement *) 0) {
141 *element = start;
142 start = start->next;
143 if (start != (AccessBridgeQueueElement *) 0) {
144 start->previous = (AccessBridgeQueueElement *) 0;
145 } else {
146 end = (AccessBridgeQueueElement *) 0;
147 if (size != 1) {
148 returnVal = cQueueBroken; // bad voodo, should only be 1 in this situation
149 }
150 }
151 size--;
152 } else {
153 returnVal = cQueueBroken; // bad voodo!
154 }
155 } else {
156 returnVal = cQueueEmpty;
157 }
158 }
159 queueLocked = FALSE;
160 PrintDebugString(" returning from AccessBridgeMessageQueue::remove()");
161 return returnVal;
162 }
163
164
165 /**
166 * setRemoveLock - set the state of the removeLock (TRUE or FALSE)
167 *
168 */
169 QueueReturns
170 AccessBridgeMessageQueue::setRemoveLock(BOOL removeLockSetting) {
171 if (queueLocked) {
172 return cQueueInUse;
173 }
174 queueRemoveLocked = removeLockSetting;
175
176 return cQueueOK;
177 }
178
179 /**
180 * setRemoveLock - set the state of the removeLock (TRUE or FALSE)
181 *
182 */
183 BOOL
184 AccessBridgeMessageQueue::getRemoveLockSetting() {
185 return queueRemoveLocked;
186 }