Added ScheduledReporter::stopNow() to shut down immediately...

src/cppmetrics/concurrent/simple_scheduled_thread_pool_executor.cpp

@@ -65,7 +65,6 @@ void SimpleScheduledThreadPoolExecutor::cancelTimers() {
 void SimpleScheduledThreadPoolExecutor::timerHandler(
         const boost::system::error_code& ec, size_t timer_index) {
     if (!running_) {
-        LOG(ERROR)<< "Timer not started.";
         return;
     }
 

src/cppmetrics/core/scheduled_reporter.cpp

@@ -63,6 +63,13 @@ void ScheduledReporter::stop() {
     }
 }
 
+void ScheduledReporter::stopNow() {
+    if (running_) {
+        running_ = false;
+        scheduled_executor_.shutdownNow();
+    }
+}
+
 std::string ScheduledReporter::rateUnitInSec() const {
     std::ostringstream ostrstr;
     ostrstr << rate_factor_;

src/cppmetrics/core/scheduled_reporter.h

@@ -62,6 +62,12 @@ class ScheduledReporter: public Reporter {
      */
     virtual void stop();
 
+    /**
+     * Shuts down the background thread that polls/publishes the metrics from the registry, without
+     * waiting for pending tasks to complete.
+     */
+    virtual void stopNow();
+
 protected:
 
     /**