Support async::executor::clear()

libs/async/include/psemek/async/event_loop.hpp

@@ -17,6 +17,8 @@ namespace psemek::async
 
 		void stop() override;
 
+		void clear() override;
+
 		void wait() override;
 
 		void wait_for(clock::duration period) override;

libs/async/include/psemek/async/executor.hpp

@@ -29,6 +29,9 @@ namespace psemek::async
 		// NB: the executor must call stop() from destructor.
 		virtual void stop() = 0;
 
+		// Clear the pending tasks queue.
+		virtual void clear() = 0;
+
 		// Wait for all the tasks to be executed.
 		// May take forever.
 		virtual void wait() = 0;

libs/async/include/psemek/async/synchronous_executor.hpp

@@ -14,6 +14,8 @@ namespace psemek::async
 
 		void stop() override;
 
+		void clear() override;
+
 		void wait() override;
 
 		void wait_for(clock::duration period) override;

libs/async/include/psemek/async/threadpool.hpp

@@ -31,6 +31,8 @@ namespace psemek::async
 
 		void stop() override;
 
+		void clear() override;
+
 		void wait() override;
 
 		void wait_for(clock::duration period) override;

libs/async/source/event_loop.cpp

@@ -1,7 +1,5 @@
 #include <psemek/async/event_loop.hpp>
 
-#include <algorithm>
-
 namespace psemek::async
 {
 
@@ -20,6 +18,11 @@ namespace psemek::async
 		queue_.clear();
 	}
 
+	void event_loop::clear()
+	{
+		queue_.clear();
+	}
+
 	void event_loop::wait()
 	{
 		while (!queue_.empty())

libs/async/source/synchronous_executor.cpp

@@ -1,8 +1,6 @@
 #include <psemek/async/synchronous_executor.hpp>
 #include <psemek/util/exception.hpp>
 
-#include <stdexcept>
-
 namespace psemek::async
 {
 
@@ -19,6 +17,9 @@ namespace psemek::async
 	void synchronous_executor::stop()
 	{}
 
+	void synchronous_executor::clear()
+	{}
+
 	void synchronous_executor::wait()
 	{}
 

libs/async/source/threadpool.cpp

@@ -85,6 +85,11 @@ namespace psemek::async
 		threads_.clear();
 	}
 
+	void threadpool::clear()
+	{
+		task_queue_.clear();
+	}
+
 	void threadpool::wait()
 	{
 		std::unique_lock lock{working_count_mutex_};