author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:10:06 +0200 | |
branch | RCL_3 |
changeset 4 | 38249ef85f99 |
parent 0 | d0f3a028347a |
permissions | -rw-r--r-- |
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/** |
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* @file MsgQInternals.cpp |
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* Description: Source file for MsgQLib |
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* Copyright (c) 2007 Nokia Corporation. |
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* All rights reserved. |
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* Redistribution and use in source and binary forms, with or without modification, |
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* are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright notice, this list |
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* of conditions and the following disclaimer.Redistributions in binary form must |
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* reproduce the above copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided with the distribution. |
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* Neither the name of the Nokia Corporation nor the names of its contributors may be used |
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* to endorse or promote products derived from this software without specific prior written |
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* permission. |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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* SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <stdlib.h> |
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#include <msgqinternal.h> |
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#include <e32property.h> |
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/* Declaration and definition of Internal Functions and data structures */ |
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#ifdef __WINSCW__ |
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#include <e32std.h> |
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typedef void TAny; |
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#include <pls.h> // For emulator WSD API |
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const TUid KMsgQLibUid3 = {0xA0001319}; |
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typedef struct { |
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MSGQ_INFO_PTR _MsgQInfo[MSGQ_TBL_SZ]; |
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MSGQ_INFO_LIST_PTR _MsgQListHead; |
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}MsgQGlobalData; |
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int InitWSDVar(MsgQGlobalData* p) { |
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p->_MsgQListHead = NULL; |
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return 0; |
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} |
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MsgQGlobalData* GetGlobal() { |
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// Access the PLS of this process |
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MsgQGlobalData* p = Pls<MsgQGlobalData>(KMsgQLibUid3, &InitWSDVar); |
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return p; |
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} |
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MSGQ_INFO_PTR* _MsgQInfo() { |
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//return &(GetGlobal()->_MsgQInfo[0]); // orig code |
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MSGQ_INFO_PTR* p = (GetGlobal()->_MsgQInfo); |
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return p; |
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//return (GetGlobal()->_MsgQInfo); // modified line |
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}; |
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MSGQ_INFO_LIST_PTR* _MsgQListHead() { |
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return &(GetGlobal()->_MsgQListHead); |
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}; |
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#define MsgQInfo (_MsgQInfo()) |
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#define MsgQListHead (*_MsgQListHead()) |
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#else |
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MSGQ_INFO_PTR MsgQInfo[MSGQ_TBL_SZ]; |
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MSGQ_INFO_LIST_PTR MsgQListHead = NULL; |
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#endif |
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inline unsigned int HashIndex(ULONG qName); |
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/*************** INTERNAL FUNCTIONS ******************************/ |
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/*************************************************************************** |
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* InstallMsqQTable (qName, qid, semId, sendState, numMsgs, err) |
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* Function: This function installs a queue into the hash table |
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****************************************************************************/ |
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int InstallMsqQTable(ULONG qName, int qId, int semId, int* err) { |
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MSGQ_INFO_PTR pMsgQInfo = NULL; |
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unsigned int index; |
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if ((pMsgQInfo = MsgQTableLookup(qName)) == NULL) { |
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pMsgQInfo = (MSGQ_INFO_PTR)malloc(sizeof(*pMsgQInfo)); |
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if(pMsgQInfo != NULL) { |
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index = HashIndex(qName); |
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pMsgQInfo->next = MsgQInfo[index]; |
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MsgQInfo[index] = pMsgQInfo; |
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pMsgQInfo->qName = qName; |
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pMsgQInfo->qId = qId; |
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pMsgQInfo->semId = semId; |
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pMsgQInfo->sendState = MSG_Q_READY; |
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pMsgQInfo->numMsgs = 0; |
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|
101 |
|
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102 |
*err = OK; |
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103 |
return (OK); |
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104 |
} |
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105 |
else |
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106 |
*err = KMsgQLibNoMemoryErr; |
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107 |
} |
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108 |
else |
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109 |
*err = KMsgQLibQIdErr; |
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110 |
|
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111 |
return(ERROR); |
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112 |
|
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113 |
} |
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114 |
|
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115 |
|
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116 |
/****************************************************************************** |
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117 |
* HashIndex |
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118 |
* Function: This function returns the hash index |
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119 |
*******************************************************************************/ |
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120 |
|
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121 |
inline unsigned int HashIndex(ULONG qName) { |
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unsigned int hash_index = (qName % MSGQ_TBL_SZ); |
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123 |
//return(qName % MSGQ_TBL_SZ); |
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124 |
return hash_index; |
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125 |
} |
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126 |
|
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127 |
|
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128 |
/************************************************************************ |
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129 |
* MsgQTableLookup (qName) |
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130 |
* Function: This function finds the block pointer for each queue |
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131 |
*************************************************************************/ |
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132 |
|
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133 |
MSGQ_INFO* MsgQTableLookup(ULONG qName) { |
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134 |
MSGQ_INFO_PTR pMsgQInfo = NULL; |
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|
135 |
|
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|
136 |
for (pMsgQInfo = MsgQInfo[HashIndex(qName)]; pMsgQInfo != NULL; pMsgQInfo = pMsgQInfo->next) { |
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137 |
if (qName == pMsgQInfo->qName) |
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|
138 |
return(pMsgQInfo); |
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|
139 |
} |
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|
140 |
|
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|
141 |
return(NULL); |
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142 |
} |
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|
143 |
|
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|
144 |
|
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|
145 |
/************************************************************************* |
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146 |
* RemoveFromMsqQTable (qName, err) |
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147 |
* Function: This function removes a queue from the hash table |
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148 |
**************************************************************************/ |
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|
149 |
|
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|
150 |
|
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|
151 |
int RemoveFromMsqQTable(ULONG qName, int* err) { |
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152 |
unsigned int index = 0; |
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153 |
MSGQ_INFO_PTR prev = NULL; |
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154 |
MSGQ_INFO_PTR pMsgQInfo = NULL; |
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155 |
|
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156 |
index = HashIndex(qName); |
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157 |
for (pMsgQInfo = MsgQInfo[index]; pMsgQInfo != NULL; pMsgQInfo = pMsgQInfo->next) { |
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158 |
if (qName == pMsgQInfo->qName) |
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159 |
break; |
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160 |
prev = pMsgQInfo; |
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161 |
} |
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|
162 |
|
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|
163 |
if (pMsgQInfo != NULL) { |
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|
164 |
if (prev == NULL) |
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|
165 |
MsgQInfo[index] = pMsgQInfo->next; |
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|
166 |
else |
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|
167 |
prev->next = pMsgQInfo->next; |
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|
168 |
|
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|
169 |
free((void*)pMsgQInfo); |
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|
170 |
*err = OK; |
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|
171 |
return (OK); |
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|
172 |
} |
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|
173 |
else |
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|
174 |
*err = KMsgQLibQIdErr; |
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|
175 |
|
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|
176 |
return(ERROR); |
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|
177 |
} |
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|
178 |
|
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|
179 |
|
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|
180 |
/************************************************************************ |
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181 |
* AddToMsgQTable (qName) |
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182 |
* Function: Adding a queue to list |
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|
183 |
*************************************************************************/ |
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|
184 |
|
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185 |
void AddToMsgQTable(ULONG qName) { |
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186 |
MSGQ_INFO_LIST_PTR tempNext; |
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|
187 |
|
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|
188 |
if (MsgQListHead != NULL) { |
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|
189 |
/* subsequent entries */ |
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|
190 |
tempNext = MsgQListHead->next; |
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|
191 |
|
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|
192 |
if ((MsgQListHead->next = (MSGQ_INFO_LIST*)malloc(sizeof(MSGQ_INFO_LIST))) != NULL) { |
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|
193 |
MsgQListHead->next->next = tempNext; |
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|
194 |
MsgQListHead->next->qName = qName; |
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|
195 |
} |
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196 |
else |
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|
197 |
MsgQListHead->next = tempNext; |
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|
198 |
} |
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|
199 |
else { |
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|
200 |
if ((MsgQListHead = (MSGQ_INFO_LIST*)malloc(sizeof(MSGQ_INFO_LIST))) != NULL) { |
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|
201 |
MsgQListHead->next = NULL; |
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|
202 |
MsgQListHead->qName = qName; |
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|
203 |
} |
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|
204 |
} |
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|
205 |
} |
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|
206 |
|
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/************************************************************************ |
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* DeleteFromMsgQTable (qName) |
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* Function: removing a queu entry from list |
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*************************************************************************/ |
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|
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void DeleteFromMsgQTable(ULONG qName) { |
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MSGQ_INFO_LIST_PTR prev = NULL; |
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MSGQ_INFO_LIST_PTR pMsgQInfo = NULL; |
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|
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for (pMsgQInfo = MsgQListHead; pMsgQInfo != NULL; pMsgQInfo = pMsgQInfo->next) { |
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if (qName == pMsgQInfo->qName) |
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break; |
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prev = pMsgQInfo; |
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} |
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|
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if (pMsgQInfo != NULL) { |
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/* Check whether prev pointer is null or not. If it is Null, update Head pointer */ |
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if( prev == NULL ) |
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MsgQListHead = MsgQListHead->next ; |
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|
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/* Else update the linked list by removing present node and updating prev next pointer */ |
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else |
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prev->next = pMsgQInfo->next; |
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|
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/* Now free up the memory used by the present node */ |
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free((void*) pMsgQInfo); |
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} |
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} |
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|
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// end of fil |