Fix #386 stuck on exit because of stucked wait in netloop

src/searchdha.cpp

@@ -1762,6 +1762,11 @@ void AgentConn_t::HardTimeoutCallback ()
	sphLogDebugA ( "%d <- hard timeout (ref=%d)", m_iStoreTag, ( int ) GetRefcount () );
}

void AgentConn_t::AbortCallback()
{
	ReportFinish (false);
}

void AgentConn_t::ErrorCallback ( int64_t iWaited )
{
	if ( !m_pPollerTask )
@@ -3540,6 +3545,19 @@ class LazyNetEvents_c : ISphNoncopyable, protected NetEventsFlavour_c
		return bHasTimeout; /// means 'infinite'
	}

	/// abandon and release all events (on shutdown)
	void AbortScheduled ()
	{
		while ( !m_dTimeouts.IsEmpty () )
		{
			auto pTask = m_dTimeouts.Root ();
			m_dTimeouts.Pop ();
			CSphRefcountedPtr<AgentConn_t> pKeepConn ( DeleteTask ( pTask, false ) );
			if ( pKeepConn )
				pKeepConn->AbortCallback ();
		}
	}

	/// one event cycle.
	/// \return false to stop event loop and exit.
	bool EventTick () REQUIRES ( LazyThread )
@@ -3558,6 +3576,7 @@ class LazyNetEvents_c : ISphNoncopyable, protected NetEventsFlavour_c

		if ( g_bShutdown )
		{
			AbortScheduled();
			sphInfo ( "EventTick() exit because of shutdown=%d", g_bShutdown );
			return false;
		}

src/searchdha.h

@@ -495,6 +495,7 @@ struct AgentConn_t : public ISphRefcountedMT
	void RecvCallback ( int64_t iWaited, DWORD uReceived );
	void SoftTimeoutCallback();
	void HardTimeoutCallback();
	void AbortCallback();

#if USE_WINDOWS
	// move recv buffer to dOut, reinit mine.