Documentation for concurrent and small improvements

git-svn-id: svn://db.shs.com.ru/pip@868 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

src_concurrent/executor.cpp

@@ -11,7 +11,8 @@ PIThreadPoolExecutor::PIThreadPoolExecutor(size_t corePoolSize, PIBlockingDequeu
             auto runnable = taskQueue->poll(100, std::function<void()>());
             if (runnable) {
                 runnable();
-            } else if (isShutdown_) threadPool[i]->stop();
+            }
+            if (isShutdown_ && taskQueue->size() == 0) threadPool[i]->stop();
         });
         threadPool.push_back(thread);
         thread->start();
@@ -35,7 +36,6 @@ void PIThreadPoolExecutor::shutdownNow() {
 
 PIThreadPoolExecutor::~PIThreadPoolExecutor() {
     shutdownNow();
-    taskQueue->getConditionVar()->notifyAll();
     while (threadPool.size() > 0) delete threadPool.take_back();
     delete threadFactory;
     delete taskQueue;
@@ -48,3 +48,7 @@ void PIThreadPoolExecutor::execute(const std::function<void()> &runnable) {
 volatile bool PIThreadPoolExecutor::isShutdown() const {
     return isShutdown_;
 }
+
+void PIThreadPoolExecutor::shutdown() {
+    isShutdown_ = true;
+}