Allow CpuBoundWork to be done before end of scope

lib/base/io-engine.cpp

@@ -31,6 +31,7 @@
 using namespace icinga;
 
 CpuBoundWork::CpuBoundWork(boost::asio::yield_context yc)
+	: m_Done(false)
 {
 	auto& ioEngine (IoEngine::Get());
 
@@ -49,8 +50,19 @@ CpuBoundWork::CpuBoundWork(boost::asio::yield_context yc)
 
 CpuBoundWork::~CpuBoundWork()
 {
+	if (!m_Done) {
 		IoEngine::Get().m_CpuBoundSemaphore.fetch_add(1);
 	}
+}
+
+void CpuBoundWork::Done()
+{
+	if (!m_Done) {
+		IoEngine::Get().m_CpuBoundSemaphore.fetch_add(1);
+
+		m_Done = true;
+	}
+}
 
 LazyInit<std::unique_ptr<IoEngine>> IoEngine::m_Instance ([]() { return std::unique_ptr<IoEngine>(new IoEngine()); });
 

lib/base/io-engine.hpp

@@ -48,6 +48,11 @@ public:
 	CpuBoundWork& operator=(const CpuBoundWork&) = delete;
 	CpuBoundWork& operator=(CpuBoundWork&&) = delete;
 	~CpuBoundWork();
+
+	void Done();
+
+private:
+	bool m_Done;
 };
 
 /**