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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.master.assignment;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.util.ArrayDeque;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.Queue;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.locks.Condition;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.concurrent.locks.Lock;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.concurrent.locks.ReentrantLock;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.client.RegionInfo;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.procedure2.Procedure;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.procedure2.ProcedureFutureUtil;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.procedure2.ProcedureSuspendedException;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">030</span><span id="line-30"></span> |
| <span class="source-line-no">031</span><span id="line-31">/**</span> |
| <span class="source-line-no">032</span><span id="line-32"> * A lock implementation which supports unlock by another thread.</span> |
| <span class="source-line-no">033</span><span id="line-33"> * <p></span> |
| <span class="source-line-no">034</span><span id="line-34"> * This is because we need to hold region state node lock while updating region state to meta(for</span> |
| <span class="source-line-no">035</span><span id="line-35"> * keeping consistency), so it is better to yield the procedure to release the procedure worker. But</span> |
| <span class="source-line-no">036</span><span id="line-36"> * after waking up the procedure, we may use another procedure worker to execute the procedure,</span> |
| <span class="source-line-no">037</span><span id="line-37"> * which means we need to unlock by another thread.</span> |
| <span class="source-line-no">038</span><span id="line-38"> * <p></span> |
| <span class="source-line-no">039</span><span id="line-39"> * For locking by procedure, we will also suspend the procedure if the lock is not ready, and</span> |
| <span class="source-line-no">040</span><span id="line-40"> * schedule it again when lock is ready. This is very important to not block the PEWorker as we may</span> |
| <span class="source-line-no">041</span><span id="line-41"> * hold the lock when updating meta, which could take a lot of time.</span> |
| <span class="source-line-no">042</span><span id="line-42"> * <p></span> |
| <span class="source-line-no">043</span><span id="line-43"> * Please see HBASE-28196 for more details.</span> |
| <span class="source-line-no">044</span><span id="line-44"> */</span> |
| <span class="source-line-no">045</span><span id="line-45">@InterfaceAudience.Private</span> |
| <span class="source-line-no">046</span><span id="line-46">class RegionStateNodeLock {</span> |
| <span class="source-line-no">047</span><span id="line-47"></span> |
| <span class="source-line-no">048</span><span id="line-48"> // for better logging message</span> |
| <span class="source-line-no">049</span><span id="line-49"> private final RegionInfo regionInfo;</span> |
| <span class="source-line-no">050</span><span id="line-50"></span> |
| <span class="source-line-no">051</span><span id="line-51"> private final Lock lock = new ReentrantLock();</span> |
| <span class="source-line-no">052</span><span id="line-52"></span> |
| <span class="source-line-no">053</span><span id="line-53"> private final Queue<QueueEntry> waitingQueue = new ArrayDeque<>();</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> private Object owner;</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> private int count;</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> /**</span> |
| <span class="source-line-no">060</span><span id="line-60"> * This is for abstraction the common lock/unlock logic for both Thread and Procedure.</span> |
| <span class="source-line-no">061</span><span id="line-61"> */</span> |
| <span class="source-line-no">062</span><span id="line-62"> private interface QueueEntry {</span> |
| <span class="source-line-no">063</span><span id="line-63"></span> |
| <span class="source-line-no">064</span><span id="line-64"> /**</span> |
| <span class="source-line-no">065</span><span id="line-65"> * A thread, or a procedure.</span> |
| <span class="source-line-no">066</span><span id="line-66"> */</span> |
| <span class="source-line-no">067</span><span id="line-67"> Object getOwner();</span> |
| <span class="source-line-no">068</span><span id="line-68"></span> |
| <span class="source-line-no">069</span><span id="line-69"> /**</span> |
| <span class="source-line-no">070</span><span id="line-70"> * Called when we can not hold the lock and should wait. For thread, you should wait on a</span> |
| <span class="source-line-no">071</span><span id="line-71"> * condition, and for procedure, a ProcedureSuspendedException should be thrown.</span> |
| <span class="source-line-no">072</span><span id="line-72"> */</span> |
| <span class="source-line-no">073</span><span id="line-73"> void await() throws ProcedureSuspendedException;</span> |
| <span class="source-line-no">074</span><span id="line-74"></span> |
| <span class="source-line-no">075</span><span id="line-75"> /**</span> |
| <span class="source-line-no">076</span><span id="line-76"> * Called when it is your turn to get the lock. For thread, just delegate the call to</span> |
| <span class="source-line-no">077</span><span id="line-77"> * condition's signal method, and for procedure, you should call the {@code wakeUp} action, to</span> |
| <span class="source-line-no">078</span><span id="line-78"> * add the procedure back to procedure scheduler.</span> |
| <span class="source-line-no">079</span><span id="line-79"> */</span> |
| <span class="source-line-no">080</span><span id="line-80"> void signal();</span> |
| <span class="source-line-no">081</span><span id="line-81"> }</span> |
| <span class="source-line-no">082</span><span id="line-82"></span> |
| <span class="source-line-no">083</span><span id="line-83"> RegionStateNodeLock(RegionInfo regionInfo) {</span> |
| <span class="source-line-no">084</span><span id="line-84"> this.regionInfo = regionInfo;</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"></span> |
| <span class="source-line-no">087</span><span id="line-87"> private void lock0(QueueEntry entry) throws ProcedureSuspendedException {</span> |
| <span class="source-line-no">088</span><span id="line-88"> lock.lock();</span> |
| <span class="source-line-no">089</span><span id="line-89"> try {</span> |
| <span class="source-line-no">090</span><span id="line-90"> for (;;) {</span> |
| <span class="source-line-no">091</span><span id="line-91"> if (owner == null) {</span> |
| <span class="source-line-no">092</span><span id="line-92"> owner = entry.getOwner();</span> |
| <span class="source-line-no">093</span><span id="line-93"> count = 1;</span> |
| <span class="source-line-no">094</span><span id="line-94"> return;</span> |
| <span class="source-line-no">095</span><span id="line-95"> }</span> |
| <span class="source-line-no">096</span><span id="line-96"> if (owner == entry.getOwner()) {</span> |
| <span class="source-line-no">097</span><span id="line-97"> count++;</span> |
| <span class="source-line-no">098</span><span id="line-98"> return;</span> |
| <span class="source-line-no">099</span><span id="line-99"> }</span> |
| <span class="source-line-no">100</span><span id="line-100"> waitingQueue.add(entry);</span> |
| <span class="source-line-no">101</span><span id="line-101"> entry.await();</span> |
| <span class="source-line-no">102</span><span id="line-102"> }</span> |
| <span class="source-line-no">103</span><span id="line-103"> } finally {</span> |
| <span class="source-line-no">104</span><span id="line-104"> lock.unlock();</span> |
| <span class="source-line-no">105</span><span id="line-105"> }</span> |
| <span class="source-line-no">106</span><span id="line-106"> }</span> |
| <span class="source-line-no">107</span><span id="line-107"></span> |
| <span class="source-line-no">108</span><span id="line-108"> private boolean tryLock0(Object lockBy) {</span> |
| <span class="source-line-no">109</span><span id="line-109"> if (!lock.tryLock()) {</span> |
| <span class="source-line-no">110</span><span id="line-110"> return false;</span> |
| <span class="source-line-no">111</span><span id="line-111"> }</span> |
| <span class="source-line-no">112</span><span id="line-112"> try {</span> |
| <span class="source-line-no">113</span><span id="line-113"> if (owner == null) {</span> |
| <span class="source-line-no">114</span><span id="line-114"> owner = lockBy;</span> |
| <span class="source-line-no">115</span><span id="line-115"> count = 1;</span> |
| <span class="source-line-no">116</span><span id="line-116"> return true;</span> |
| <span class="source-line-no">117</span><span id="line-117"> }</span> |
| <span class="source-line-no">118</span><span id="line-118"> if (owner == lockBy) {</span> |
| <span class="source-line-no">119</span><span id="line-119"> count++;</span> |
| <span class="source-line-no">120</span><span id="line-120"> return true;</span> |
| <span class="source-line-no">121</span><span id="line-121"> }</span> |
| <span class="source-line-no">122</span><span id="line-122"> return false;</span> |
| <span class="source-line-no">123</span><span id="line-123"> } finally {</span> |
| <span class="source-line-no">124</span><span id="line-124"> lock.unlock();</span> |
| <span class="source-line-no">125</span><span id="line-125"> }</span> |
| <span class="source-line-no">126</span><span id="line-126"> }</span> |
| <span class="source-line-no">127</span><span id="line-127"></span> |
| <span class="source-line-no">128</span><span id="line-128"> private void unlock0(Object unlockBy) {</span> |
| <span class="source-line-no">129</span><span id="line-129"> lock.lock();</span> |
| <span class="source-line-no">130</span><span id="line-130"> try {</span> |
| <span class="source-line-no">131</span><span id="line-131"> if (owner == null) {</span> |
| <span class="source-line-no">132</span><span id="line-132"> throw new IllegalMonitorStateException("RegionStateNode " + regionInfo + " is not locked");</span> |
| <span class="source-line-no">133</span><span id="line-133"> }</span> |
| <span class="source-line-no">134</span><span id="line-134"> if (owner != unlockBy) {</span> |
| <span class="source-line-no">135</span><span id="line-135"> throw new IllegalMonitorStateException("RegionStateNode " + regionInfo + " is locked by "</span> |
| <span class="source-line-no">136</span><span id="line-136"> + owner + ", can not be unlocked by " + unlockBy);</span> |
| <span class="source-line-no">137</span><span id="line-137"> }</span> |
| <span class="source-line-no">138</span><span id="line-138"> count--;</span> |
| <span class="source-line-no">139</span><span id="line-139"> if (count == 0) {</span> |
| <span class="source-line-no">140</span><span id="line-140"> owner = null;</span> |
| <span class="source-line-no">141</span><span id="line-141"> QueueEntry entry = waitingQueue.poll();</span> |
| <span class="source-line-no">142</span><span id="line-142"> if (entry != null) {</span> |
| <span class="source-line-no">143</span><span id="line-143"> entry.signal();</span> |
| <span class="source-line-no">144</span><span id="line-144"> }</span> |
| <span class="source-line-no">145</span><span id="line-145"> }</span> |
| <span class="source-line-no">146</span><span id="line-146"> } finally {</span> |
| <span class="source-line-no">147</span><span id="line-147"> lock.unlock();</span> |
| <span class="source-line-no">148</span><span id="line-148"> }</span> |
| <span class="source-line-no">149</span><span id="line-149"> }</span> |
| <span class="source-line-no">150</span><span id="line-150"></span> |
| <span class="source-line-no">151</span><span id="line-151"> /**</span> |
| <span class="source-line-no">152</span><span id="line-152"> * Normal lock, will set the current thread as owner. Typically you should use try...finally to</span> |
| <span class="source-line-no">153</span><span id="line-153"> * call unlock in the finally block.</span> |
| <span class="source-line-no">154</span><span id="line-154"> */</span> |
| <span class="source-line-no">155</span><span id="line-155"> void lock() {</span> |
| <span class="source-line-no">156</span><span id="line-156"> Thread currentThread = Thread.currentThread();</span> |
| <span class="source-line-no">157</span><span id="line-157"> try {</span> |
| <span class="source-line-no">158</span><span id="line-158"> lock0(new QueueEntry() {</span> |
| <span class="source-line-no">159</span><span id="line-159"></span> |
| <span class="source-line-no">160</span><span id="line-160"> private Condition cond;</span> |
| <span class="source-line-no">161</span><span id="line-161"></span> |
| <span class="source-line-no">162</span><span id="line-162"> @Override</span> |
| <span class="source-line-no">163</span><span id="line-163"> public void signal() {</span> |
| <span class="source-line-no">164</span><span id="line-164"> cond.signal();</span> |
| <span class="source-line-no">165</span><span id="line-165"> }</span> |
| <span class="source-line-no">166</span><span id="line-166"></span> |
| <span class="source-line-no">167</span><span id="line-167"> @Override</span> |
| <span class="source-line-no">168</span><span id="line-168"> public Object getOwner() {</span> |
| <span class="source-line-no">169</span><span id="line-169"> return currentThread;</span> |
| <span class="source-line-no">170</span><span id="line-170"> }</span> |
| <span class="source-line-no">171</span><span id="line-171"></span> |
| <span class="source-line-no">172</span><span id="line-172"> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "WA_AWAIT_NOT_IN_LOOP",</span> |
| <span class="source-line-no">173</span><span id="line-173"> justification = "Loop is in the caller method")</span> |
| <span class="source-line-no">174</span><span id="line-174"> @Override</span> |
| <span class="source-line-no">175</span><span id="line-175"> public void await() {</span> |
| <span class="source-line-no">176</span><span id="line-176"> if (cond == null) {</span> |
| <span class="source-line-no">177</span><span id="line-177"> cond = lock.newCondition();</span> |
| <span class="source-line-no">178</span><span id="line-178"> }</span> |
| <span class="source-line-no">179</span><span id="line-179"> cond.awaitUninterruptibly();</span> |
| <span class="source-line-no">180</span><span id="line-180"> }</span> |
| <span class="source-line-no">181</span><span id="line-181"> });</span> |
| <span class="source-line-no">182</span><span id="line-182"> } catch (ProcedureSuspendedException e) {</span> |
| <span class="source-line-no">183</span><span id="line-183"> // should not happen</span> |
| <span class="source-line-no">184</span><span id="line-184"> throw new AssertionError(e);</span> |
| <span class="source-line-no">185</span><span id="line-185"> }</span> |
| <span class="source-line-no">186</span><span id="line-186"> }</span> |
| <span class="source-line-no">187</span><span id="line-187"></span> |
| <span class="source-line-no">188</span><span id="line-188"> /**</span> |
| <span class="source-line-no">189</span><span id="line-189"> * Normal tryLock, will set the current thread as owner. Typically you should use try...finally to</span> |
| <span class="source-line-no">190</span><span id="line-190"> * call unlock in the finally block.</span> |
| <span class="source-line-no">191</span><span id="line-191"> */</span> |
| <span class="source-line-no">192</span><span id="line-192"> boolean tryLock() {</span> |
| <span class="source-line-no">193</span><span id="line-193"> return tryLock0(Thread.currentThread());</span> |
| <span class="source-line-no">194</span><span id="line-194"> }</span> |
| <span class="source-line-no">195</span><span id="line-195"></span> |
| <span class="source-line-no">196</span><span id="line-196"> /**</span> |
| <span class="source-line-no">197</span><span id="line-197"> * Normal unLock, will use the current thread as owner. Typically you should use try...finally to</span> |
| <span class="source-line-no">198</span><span id="line-198"> * call unlock in the finally block.</span> |
| <span class="source-line-no">199</span><span id="line-199"> */</span> |
| <span class="source-line-no">200</span><span id="line-200"> void unlock() {</span> |
| <span class="source-line-no">201</span><span id="line-201"> unlock0(Thread.currentThread());</span> |
| <span class="source-line-no">202</span><span id="line-202"> }</span> |
| <span class="source-line-no">203</span><span id="line-203"></span> |
| <span class="source-line-no">204</span><span id="line-204"> /**</span> |
| <span class="source-line-no">205</span><span id="line-205"> * Lock by a procedure. You can release the lock in another thread.</span> |
| <span class="source-line-no">206</span><span id="line-206"> * <p></span> |
| <span class="source-line-no">207</span><span id="line-207"> * When the procedure can not get the lock immediately, a ProcedureSuspendedException will be</span> |
| <span class="source-line-no">208</span><span id="line-208"> * thrown to suspend the procedure. And when we want to wake up a procedure, we will call the</span> |
| <span class="source-line-no">209</span><span id="line-209"> * {@code wakeUp} action. Usually in the {@code wakeUp} action you should add the procedure back</span> |
| <span class="source-line-no">210</span><span id="line-210"> * to procedure scheduler.</span> |
| <span class="source-line-no">211</span><span id="line-211"> */</span> |
| <span class="source-line-no">212</span><span id="line-212"> void lock(Procedure<?> proc, Runnable wakeUp) throws ProcedureSuspendedException {</span> |
| <span class="source-line-no">213</span><span id="line-213"> lock0(new QueueEntry() {</span> |
| <span class="source-line-no">214</span><span id="line-214"></span> |
| <span class="source-line-no">215</span><span id="line-215"> @Override</span> |
| <span class="source-line-no">216</span><span id="line-216"> public Object getOwner() {</span> |
| <span class="source-line-no">217</span><span id="line-217"> return proc;</span> |
| <span class="source-line-no">218</span><span id="line-218"> }</span> |
| <span class="source-line-no">219</span><span id="line-219"></span> |
| <span class="source-line-no">220</span><span id="line-220"> @Override</span> |
| <span class="source-line-no">221</span><span id="line-221"> public void await() throws ProcedureSuspendedException {</span> |
| <span class="source-line-no">222</span><span id="line-222"> ProcedureFutureUtil.suspend(proc);</span> |
| <span class="source-line-no">223</span><span id="line-223"> }</span> |
| <span class="source-line-no">224</span><span id="line-224"></span> |
| <span class="source-line-no">225</span><span id="line-225"> @Override</span> |
| <span class="source-line-no">226</span><span id="line-226"> public void signal() {</span> |
| <span class="source-line-no">227</span><span id="line-227"> // Here we need to set the owner to the procedure directly.</span> |
| <span class="source-line-no">228</span><span id="line-228"> // For thread, we just block inside the lock0 method, so after signal we will continue and</span> |
| <span class="source-line-no">229</span><span id="line-229"> // get the lock</span> |
| <span class="source-line-no">230</span><span id="line-230"> // For procedure, the waking up here is actually a reschedule of the procedure to</span> |
| <span class="source-line-no">231</span><span id="line-231"> // ProcedureExecutor, so here we need to set the owner first, and it is the procedure's duty</span> |
| <span class="source-line-no">232</span><span id="line-232"> // to make sure that it has already hold the lock so do not need to call lock again, usually</span> |
| <span class="source-line-no">233</span><span id="line-233"> // this should be done by calling isLockedBy method below</span> |
| <span class="source-line-no">234</span><span id="line-234"> assert owner == null;</span> |
| <span class="source-line-no">235</span><span id="line-235"> assert count == 0;</span> |
| <span class="source-line-no">236</span><span id="line-236"> owner = proc;</span> |
| <span class="source-line-no">237</span><span id="line-237"> count = 1;</span> |
| <span class="source-line-no">238</span><span id="line-238"> wakeUp.run();</span> |
| <span class="source-line-no">239</span><span id="line-239"> }</span> |
| <span class="source-line-no">240</span><span id="line-240"> });</span> |
| <span class="source-line-no">241</span><span id="line-241"> }</span> |
| <span class="source-line-no">242</span><span id="line-242"></span> |
| <span class="source-line-no">243</span><span id="line-243"> /**</span> |
| <span class="source-line-no">244</span><span id="line-244"> * TryLock by a procedure. You can release the lock in another thread.</span> |
| <span class="source-line-no">245</span><span id="line-245"> */</span> |
| <span class="source-line-no">246</span><span id="line-246"> boolean tryLock(Procedure<?> proc) {</span> |
| <span class="source-line-no">247</span><span id="line-247"> return tryLock0(proc);</span> |
| <span class="source-line-no">248</span><span id="line-248"> }</span> |
| <span class="source-line-no">249</span><span id="line-249"></span> |
| <span class="source-line-no">250</span><span id="line-250"> /**</span> |
| <span class="source-line-no">251</span><span id="line-251"> * Unlock by a procedure. You do not need to call this method in the same thread with lock.</span> |
| <span class="source-line-no">252</span><span id="line-252"> */</span> |
| <span class="source-line-no">253</span><span id="line-253"> void unlock(Procedure<?> proc) {</span> |
| <span class="source-line-no">254</span><span id="line-254"> unlock0(proc);</span> |
| <span class="source-line-no">255</span><span id="line-255"> }</span> |
| <span class="source-line-no">256</span><span id="line-256"></span> |
| <span class="source-line-no">257</span><span id="line-257"> /**</span> |
| <span class="source-line-no">258</span><span id="line-258"> * Check whether the lock is locked by someone.</span> |
| <span class="source-line-no">259</span><span id="line-259"> */</span> |
| <span class="source-line-no">260</span><span id="line-260"> boolean isLocked() {</span> |
| <span class="source-line-no">261</span><span id="line-261"> lock.lock();</span> |
| <span class="source-line-no">262</span><span id="line-262"> try {</span> |
| <span class="source-line-no">263</span><span id="line-263"> return owner != null;</span> |
| <span class="source-line-no">264</span><span id="line-264"> } finally {</span> |
| <span class="source-line-no">265</span><span id="line-265"> lock.unlock();</span> |
| <span class="source-line-no">266</span><span id="line-266"> }</span> |
| <span class="source-line-no">267</span><span id="line-267"> }</span> |
| <span class="source-line-no">268</span><span id="line-268"></span> |
| <span class="source-line-no">269</span><span id="line-269"> /**</span> |
| <span class="source-line-no">270</span><span id="line-270"> * Check whether the lock is locked by the given {@code lockBy}.</span> |
| <span class="source-line-no">271</span><span id="line-271"> */</span> |
| <span class="source-line-no">272</span><span id="line-272"> boolean isLockedBy(Object lockBy) {</span> |
| <span class="source-line-no">273</span><span id="line-273"> lock.lock();</span> |
| <span class="source-line-no">274</span><span id="line-274"> try {</span> |
| <span class="source-line-no">275</span><span id="line-275"> return owner == lockBy;</span> |
| <span class="source-line-no">276</span><span id="line-276"> } finally {</span> |
| <span class="source-line-no">277</span><span id="line-277"> lock.unlock();</span> |
| <span class="source-line-no">278</span><span id="line-278"> }</span> |
| <span class="source-line-no">279</span><span id="line-279"> }</span> |
| <span class="source-line-no">280</span><span id="line-280">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
