IfwApiCheckTask: Process final cr in the global thread pool

lib/methods/ifwapichecktask.cpp

@@ -105,7 +105,6 @@ static void DoIfwNetIo(
 		sslConn.async_shutdown(yc[ec]);
 	}
 
-	CpuBoundWork cbw (yc);
 	Value jsonRoot;
 
 	try {
@@ -447,9 +446,12 @@ void IfwApiCheckTask::ScriptFunc(const Checkable::Ptr& checkable, const CheckRes
 
 	auto conn (Shared<AsioTlsStream>::Make(io, *ctx, expectedSan));
 
+	// Handler for the final check result that is used to asynchronously process within the global non-I/O thread pool.
+	auto handler ([cr, resultHandler = std::move(resultHandler)]() { resultHandler(cr); });
+
 	IoEngine::SpawnCoroutine(
 		*strand,
-		[strand, checkable, cr, cmdLine, psCommand, psHost, expectedSan, psPort, conn, req, checkTimeout, handler = std::move(resultHandler)](asio::yield_context yc) {
+		[strand, checkable, cr, psCommand, psHost, expectedSan, psPort, conn, req, checkTimeout, handler = std::move(handler)](asio::yield_context yc) {
 			Timeout::Ptr timeout = new Timeout(strand->context(), *strand, boost::posix_time::microseconds(int64_t(checkTimeout * 1e6)),
 				[&conn, &checkable](boost::asio::yield_context yc) {
 					Log(LogNotice, "IfwApiCheckTask")
@@ -466,7 +468,10 @@ void IfwApiCheckTask::ScriptFunc(const Checkable::Ptr& checkable, const CheckRes
 			DoIfwNetIo(yc, cr, psCommand, psHost, expectedSan, psPort, *conn, *req);
 
 			cr->SetExecutionEnd(Utility::GetTime());
-			handler(cr);
+
+			// Post the check result processing to the global pool not to block the I/O threads,
+			// which could affect processing important RPC messages and HTTP connections.
+			Utility::QueueAsyncCallback(std::ref(handler));
 		}
 	);
 }