author | Jussi Ryoma <ext-jussi.s.ryoma@nokia.com> |
Fri, 27 Aug 2010 12:21:46 +0300 | |
changeset 3 | 045ade241ef5 |
parent 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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using System; |
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using System.Collections; |
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using System.Collections.Generic; |
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using System.Text; |
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using System.Threading; |
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|
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namespace SymbianUtils.Threading |
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{ |
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public class BlockingQueue<T> : ICollection, IEnumerable |
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{ |
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#region Constructors |
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public BlockingQueue() |
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: this( -1 ) |
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{ |
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} |
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|
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public BlockingQueue( int aMaxSize ) |
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{ |
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iMaxSize = aMaxSize; |
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iQueue = new Queue<T>(); |
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} |
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#endregion |
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|
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#region API |
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public void Enqueue( T aItem ) |
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{ |
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lock ( this.SyncRoot ) |
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{ |
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// We want to prevent the queue from growing beyond it's own |
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// bounds, unless the creator requested an unbounded queue. |
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if ( iMaxSize > 0 ) |
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{ |
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while ( this.Count >= iMaxSize ) |
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{ |
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try |
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{ |
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Monitor.Wait( this.SyncRoot ); |
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} |
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catch |
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{ |
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Monitor.PulseAll( this.SyncRoot ); |
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throw; |
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} |
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} |
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} |
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|
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// Now it's okay to add the item |
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iQueue.Enqueue( aItem ); |
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|
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// If the count is now one, then we've just added the first |
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// item, in which case we must pulse the monitor because |
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// there could be blocked threads that are stuck inside the Dequeue() |
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// method, waiting for published content. |
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int count = this.Count; |
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if ( count == 1 ) |
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{ |
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Monitor.PulseAll( this.SyncRoot ); |
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} |
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} |
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} |
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|
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public bool TryToDequeue( out T aItem ) |
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{ |
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bool ret = false; |
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aItem = default( T ); |
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// |
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lock ( this.SyncRoot ) |
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{ |
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if ( this.Count > 0 ) |
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{ |
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aItem = iQueue.Dequeue(); |
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ret = true; |
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} |
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} |
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// |
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return ret; |
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} |
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|
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public void Clear() |
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{ |
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lock ( this.SyncRoot ) |
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{ |
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iQueue.Clear(); |
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|
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// Pulse, since clearing the items might allow a thread blocked |
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// inside Enqueue() to push something to the head of the list |
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Monitor.PulseAll( this.SyncRoot ); |
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} |
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} |
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|
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public T Dequeue() |
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{ |
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lock ( this.SyncRoot ) |
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{ |
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// Wait until the queue contains some content. |
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112 |
while ( this.Count == 0 ) |
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113 |
{ |
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114 |
try |
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115 |
{ |
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116 |
Monitor.Wait( this.SyncRoot ); |
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117 |
} |
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118 |
catch |
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119 |
{ |
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120 |
Monitor.PulseAll( this.SyncRoot ); |
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121 |
throw; |
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122 |
} |
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123 |
} |
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124 |
|
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125 |
T ret = iQueue.Dequeue(); |
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126 |
|
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127 |
// We dequeue the item and then check to see if we have |
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128 |
// just opened up the first free slot in the queue. |
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129 |
// If so, we must pulse the monitor because there could be |
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130 |
// threads blocked inside the Enqueue() method that are waiting |
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131 |
// for space to become available. |
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132 |
int count = this.Count; |
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133 |
if ( iMaxSize > 0 && count == iMaxSize - 1 ) |
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134 |
{ |
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135 |
Monitor.PulseAll( this.SyncRoot ); |
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136 |
} |
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137 |
// |
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138 |
return ret; |
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139 |
} |
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140 |
} |
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141 |
|
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142 |
public T Peek() |
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143 |
{ |
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144 |
lock ( this.SyncRoot ) |
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145 |
{ |
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146 |
return iQueue.Peek(); |
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147 |
} |
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148 |
} |
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149 |
|
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150 |
public bool Contains( T aItem ) |
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151 |
{ |
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152 |
lock ( this.SyncRoot ) |
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153 |
{ |
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154 |
bool ret = iQueue.Contains( aItem ); |
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155 |
return ret; |
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156 |
} |
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157 |
} |
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158 |
|
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159 |
public T[] ToArray() |
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160 |
{ |
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161 |
lock ( this.SyncRoot ) |
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162 |
{ |
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163 |
T[] ret = iQueue.ToArray(); |
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164 |
return ret; |
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165 |
} |
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166 |
} |
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167 |
#endregion |
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168 |
|
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169 |
#region From IEnumerable |
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170 |
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() |
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171 |
{ |
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172 |
throw new NotImplementedException( "You cannot enumerate a Blocking Queue - get the values and enumerate those instead" ); |
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173 |
} |
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174 |
#endregion |
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175 |
|
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|
176 |
#region From ICollection |
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177 |
public void CopyTo( Array aArray, int aIndex ) |
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178 |
{ |
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179 |
lock ( this.SyncRoot ) |
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180 |
{ |
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|
181 |
ICollection baseCol = (ICollection) iQueue; |
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182 |
baseCol.CopyTo( aArray, aIndex ); |
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183 |
} |
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184 |
} |
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|
185 |
|
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186 |
public int Count |
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187 |
{ |
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188 |
get |
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189 |
{ |
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|
190 |
lock ( this.SyncRoot ) |
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|
191 |
{ |
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|
192 |
return iQueue.Count; |
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|
193 |
} |
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|
194 |
} |
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|
195 |
} |
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|
196 |
|
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|
197 |
public bool IsSynchronized |
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|
198 |
{ |
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|
199 |
get { return true; } |
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200 |
} |
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|
201 |
|
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|
202 |
public object SyncRoot |
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|
203 |
{ |
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|
204 |
get |
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|
205 |
{ |
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|
206 |
if ( this.iSyncRoot == null ) |
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|
207 |
{ |
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|
208 |
Interlocked.CompareExchange( ref this.iSyncRoot, new object(), null ); |
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|
209 |
} |
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|
210 |
return iSyncRoot; |
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|
211 |
} |
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|
212 |
} |
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|
213 |
#endregion |
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|
214 |
|
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|
215 |
#region Data members |
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|
216 |
private readonly Queue<T> iQueue; |
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|
217 |
private object iSyncRoot = null; |
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|
218 |
private readonly int iMaxSize; |
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|
219 |
#endregion |
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|
220 |
} |
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|
221 |
} |