for bug #217, use isolate thread to improve 17% performance.

@@ -493,10 +493,117 @@ int SrsRtmpConn::check_vhost()
     return ret;
 }
 
+class IsolateRecvThread : public ISrsThreadHandler
+{
+private:
+    SrsThread* trd;
+    SrsRtmpServer* rtmp;
+    std::vector<SrsMessage*> queue;
+public:
+    IsolateRecvThread(SrsRtmpServer* rtmp_sdk)
+    {
+        rtmp = rtmp_sdk;
+        trd = new SrsThread(this, 0, true);
+    }
+    virtual ~IsolateRecvThread()
+    {
+        // stop recv thread.
+        stop();
+        
+        // destroy the thread.
+        srs_freep(trd);
+        
+        // clear all messages.
+        std::vector<SrsMessage*>::iterator it;
+        for (it = queue.begin(); it != queue.end(); ++it) {
+            SrsMessage* msg = *it;
+            srs_freep(msg);
+        }
+        queue.clear();
+    }
+public:
+    virtual bool empty()
+    {
+        return queue.empty();
+    }
+    virtual SrsMessage* pump()
+    {
+        SrsMessage* msg = *queue.begin();
+        queue.erase(queue.begin());
+        return msg;
+    }
+public:
+    virtual int start()
+    {
+        return trd->start();
+    }
+    virtual void stop()
+    {
+        trd->stop();
+    }
+    virtual int cycle()
+    {
+        int ret = ERROR_SUCCESS;
+        
+        SrsMessage* msg = NULL;
+        
+        if ((ret = rtmp->recv_message(&msg)) != ERROR_SUCCESS) {
+            if (!srs_is_client_gracefully_close(ret)) {
+                srs_error("recv client control message failed. ret=%d", ret);
+            }
+            
+            // we use no timeout to recv, should never got any error.
+            trd->stop_loop();
+            
+            return ret;
+        }
+        srs_verbose("play loop recv message. ret=%d", ret);
+        
+        return ret;
+    }
+};
+
 int SrsRtmpConn::playing(SrsSource* source)
 {
     int ret = ERROR_SUCCESS;
     
+    // the multiple messages writev improve performance large,
+    // but the timeout recv will cause 33% sys call performance,
+    // to use isolate thread to recv, can improve about 33% performance.
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/194
+    // @see: https://github.com/winlinvip/simple-rtmp-server/issues/217
+    //rtmp->set_recv_timeout(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
+    rtmp->set_recv_timeout(ST_UTIME_NO_TIMEOUT);
+    
+    // disable the protocol auto response, 
+    // for the isolate recv thread should never send any messages.
+    rtmp->set_auto_response(false);
+    
+    // use isolate thread to recv, 
+    // start isolate recv thread.
+    IsolateRecvThread trd(rtmp);
+    if ((ret = trd.start()) != ERROR_SUCCESS) {
+        srs_error("start isolate recv thread failed. ret=%d", ret);
+        return ret;
+    }
+    
+    // delivery messages for clients playing stream.
+    ret = do_playing(source, &trd);
+    
+    // stop isolate recv thread
+    trd.stop();
+    
+    // enable the protocol auto response,
+    // for the isolate recv thread terminated.
+    rtmp->set_auto_response(true);
+    
+    return ret;
+}
+
+int SrsRtmpConn::do_playing(SrsSource* source, IsolateRecvThread* trd)
+{
+    int ret = ERROR_SUCCESS;
+    
     if ((ret = refer->check(req->pageUrl, _srs_config->get_refer_play(req->vhost))) != ERROR_SUCCESS) {
         srs_error("check play_refer failed. ret=%d", ret);
         return ret;
@@ -519,38 +626,19 @@ int SrsRtmpConn::playing(SrsSource* source)
     bool user_specified_duration_to_stop = (req->duration > 0);
     int64_t starttime = -1;
     
-    // TODO: use isolate thread to recv, 
-    // @see: https://github.com/winlinvip/simple-rtmp-server/issues/196
-    // the performance bottleneck not in the timeout recv, but 
-    // in the multiple messages send, so it's ok for timeout recv,
-    // @see https://github.com/winlinvip/simple-rtmp-server/issues/194
-    rtmp->set_recv_timeout(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
-    
     while (true) {
-        // TODO: to use isolate thread to recv, can improve about 5% performance.
+        // to use isolate thread to recv, can improve about 33% performance.
         // @see: https://github.com/winlinvip/simple-rtmp-server/issues/196
-        // read from client.
-        if (true) {
-            SrsMessage* msg = NULL;
-            ret = rtmp->recv_message(&msg);
-            srs_verbose("play loop recv message. ret=%d", ret);
+        // @see: https://github.com/winlinvip/simple-rtmp-server/issues/217
+        while (!trd->empty()) {
+            SrsMessage* msg = trd->pump();
+            srs_warn("pump client message to process.");
             
-            if (ret == ERROR_SOCKET_TIMEOUT) {
-                // it's ok, do nothing.
-                ret = ERROR_SUCCESS;
-                srs_verbose("recv timeout, ignore. ret=%d", ret);
-            } else if (ret != ERROR_SUCCESS) {
-                if (!srs_is_client_gracefully_close(ret)) {
-                    srs_error("recv client control message failed. ret=%d", ret);
+            if ((ret = process_play_control_msg(consumer, msg)) != ERROR_SUCCESS) {
+                if (!srs_is_system_control_error(ret)) {
+                    srs_error("process play control message failed. ret=%d", ret);
                 }
                 return ret;
-            } else {
-                if ((ret = process_play_control_msg(consumer, msg)) != ERROR_SUCCESS) {
-                    if (!srs_is_system_control_error(ret)) {
-                        srs_error("process play control message failed. ret=%d", ret);
-                    }
-                    return ret;
-                }
             }
         }
         
@@ -564,6 +652,12 @@ int SrsRtmpConn::playing(SrsSource* source)
             srs_error("get messages from consumer failed. ret=%d", ret);
             return ret;
         }
+        
+        // no message to send, sleep a while.
+        if (count <= 0) {
+            srs_verbose("sleep for no messages to send");
+            st_usleep(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
+        }
 
         // reportable
         if (pithy_print.can_print()) {
@@ -596,7 +690,9 @@ int SrsRtmpConn::playing(SrsSource* source)
         if (count > 0) {
             // no need to assert msg, for the rtmp will assert it.
             if ((ret = rtmp->send_and_free_messages(msgs.msgs, count, res->stream_id)) != ERROR_SUCCESS) {
-                srs_error("send messages to client failed. ret=%d", ret);
+                if (!srs_is_client_gracefully_close(ret)) {
+                    srs_error("send messages to client failed. ret=%d", ret);
+                }
                 return ret;
             }
         }

@@ -49,6 +49,7 @@ class SrsBandwidth;
 class SrsKbps;
 class SrsRtmpClient;
 class SrsSharedPtrMessage;
+class IsolateRecvThread;
 
 /**
 * the client provides the main logic control for RTMP clients.
@@ -88,6 +89,7 @@ private:
     virtual int stream_service_cycle();
     virtual int check_vhost();
     virtual int playing(SrsSource* source);
+    virtual int do_playing(SrsSource* source, IsolateRecvThread* trd);
     virtual int fmle_publishing(SrsSource* source);
     virtual int do_fmle_publishing(SrsSource* source);
     virtual int flash_publishing(SrsSource* source);

@@ -161,7 +161,9 @@ void SrsThread::thread_cycle()
         srs_info("thread on before cycle success");
         
         if ((ret = handler->cycle()) != ERROR_SUCCESS) {
-            srs_warn("thread cycle failed, ignored and retry, ret=%d", ret);
+            if (!srs_is_client_gracefully_close(ret)) {
+                srs_warn("thread cycle failed, ignored and retry, ret=%d", ret);
+            }
             goto failed;
         }
         srs_info("thread cycle success");

@@ -735,6 +735,11 @@ SrsRtmpServer::~SrsRtmpServer()
     srs_freep(hs_bytes);
 }
 
+void SrsRtmpServer::set_auto_response(bool v)
+{
+    protocol->set_auto_response(v);
+}
+
 void SrsRtmpServer::set_recv_timeout(int64_t timeout_us)
 {
     protocol->set_recv_timeout(timeout_us);

@@ -335,6 +335,12 @@ public:
 // protocol methods proxy
 public:
     /**
+    * set the auto response message when recv for protocol stack.
+    * @param v, whether auto response message when recv message.
+    * @see: https://github.com/winlinvip/simple-rtmp-server/issues/217
+    */
+    virtual void set_auto_response(bool v);
+    /**
     * set/get the recv timeout in us.
     * if timeout, recv/send message return ERROR_SOCKET_TIMEOUT.
     */

@@ -415,6 +415,7 @@ SrsProtocol::SrsProtocol(ISrsProtocolReaderWriter* io)
     srs_assert(nb_out_iovs >= 2);
     
     warned_c0c3_cache_dry = false;
+    auto_response_when_recv = true;
 }
 
 SrsProtocol::~SrsProtocol()
@@ -430,6 +431,15 @@ SrsProtocol::~SrsProtocol()
         chunk_streams.clear();
     }
     
+    if (true) {
+        std::vector<SrsPacket*>::iterator it;
+        for (it = manual_response_queue.begin(); it != manual_response_queue.end(); ++it) {
+            SrsPacket* pkt = *it;
+            srs_freep(pkt);
+        }
+        manual_response_queue.clear();
+    }
+    
     srs_freep(in_buffer);
     
     // alloc by malloc, use free directly.
@@ -439,6 +449,35 @@ SrsProtocol::~SrsProtocol()
     }
 }
 
+void SrsProtocol::set_auto_response(bool v)
+{
+    auto_response_when_recv = v;
+}
+
+int SrsProtocol::manual_response_flush()
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (manual_response_queue.empty()) {
+        return ret;
+    }
+    
+    std::vector<SrsPacket*>::iterator it;
+    for (it = manual_response_queue.begin(); it != manual_response_queue.end();) {
+        SrsPacket* pkt = *it;
+        
+        // erase this packet, the send api always free it.
+        it = manual_response_queue.erase(it);
+        
+        // use underlayer api to send, donot flush again.
+        if ((ret = do_send_and_free_packet(pkt, 0)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
 void SrsProtocol::set_recv_timeout(int64_t timeout_us)
 {
     return skt->set_recv_timeout(timeout_us);
@@ -638,7 +677,9 @@ int SrsProtocol::do_send_messages(SrsMessage** msgs, int nb_msgs)
                 // when c0c3 cache dry,
                 // sendout all messages and reset the cache, then send again.
                 if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
-                    srs_error("send with writev failed. ret=%d", ret);
+                    if (!srs_is_client_gracefully_close(ret)) {
+                        srs_error("send with writev failed. ret=%d", ret);
+                    }
                     return ret;
                 }
     
@@ -663,13 +704,57 @@ int SrsProtocol::do_send_messages(SrsMessage** msgs, int nb_msgs)
     // sendout header and payload by writev.
     // decrease the sys invoke count to get higher performance.
     if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
-        srs_error("send with writev failed. ret=%d", ret);
+        if (!srs_is_client_gracefully_close(ret)) {
+            srs_error("send with writev failed. ret=%d", ret);
+        }
         return ret;
     }
     
     return ret;
 }
 
+int SrsProtocol::do_send_and_free_packet(SrsPacket* packet, int stream_id)
+{
+    int ret = ERROR_SUCCESS;
+    
+    srs_assert(packet);
+    SrsAutoFree(SrsPacket, packet);
+    
+    int size = 0;
+    char* payload = NULL;
+    if ((ret = packet->encode(size, payload)) != ERROR_SUCCESS) {
+        srs_error("encode RTMP packet to bytes oriented RTMP message failed. ret=%d", ret);
+        return ret;
+    }
+    
+    // encode packet to payload and size.
+    if (size <= 0 || payload == NULL) {
+        srs_warn("packet is empty, ignore empty message.");
+        return ret;
+    }
+    
+    // to message
+    SrsMessage* msg = new SrsCommonMessage();
+    
+    msg->payload = payload;
+    msg->size = size;
+    
+    msg->header.payload_length = size;
+    msg->header.message_type = packet->get_message_type();
+    msg->header.stream_id = stream_id;
+    msg->header.perfer_cid = packet->get_prefer_cid();
+
+    // donot use the auto free to free the msg,
+    // for performance issue.
+    ret = do_send_messages(&msg, 1);
+    if (ret == ERROR_SUCCESS) {
+        ret = on_send_packet(msg, packet);
+    }
+    srs_freep(msg);
+    
+    return ret;
+}
+
 void SrsProtocol::generate_chunk_header(char* cache, SrsMessageHeader* mh, bool c0, int* pnbh, char** ph) 
 {
     // to directly set the field.
@@ -948,6 +1033,16 @@ int SrsProtocol::send_and_free_messages(SrsMessage** msgs, int nb_msgs, int stre
         srs_freep(msg);
     }
     
+    // donot flush when send failed
+    if (ret != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // flush messages in manual queue
+    if ((ret = manual_response_flush()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     return ret;
 }
 
@@ -955,41 +1050,15 @@ int SrsProtocol::send_and_free_packet(SrsPacket* packet, int stream_id)
 {
     int ret = ERROR_SUCCESS;
     
-    srs_assert(packet);
-    SrsAutoFree(SrsPacket, packet);
-    
-    int size = 0;
-    char* payload = NULL;
-    if ((ret = packet->encode(size, payload)) != ERROR_SUCCESS) {
-        srs_error("encode RTMP packet to bytes oriented RTMP message failed. ret=%d", ret);
+    if ((ret = do_send_and_free_packet(packet, stream_id)) != ERROR_SUCCESS) {
         return ret;
     }
     
-    // encode packet to payload and size.
-    if (size <= 0 || payload == NULL) {
-        srs_warn("packet is empty, ignore empty message.");
+    // flush messages in manual queue
+    if ((ret = manual_response_flush()) != ERROR_SUCCESS) {
         return ret;
     }
     
-    // to message
-    SrsMessage* msg = new SrsCommonMessage();
-    
-    msg->payload = payload;
-    msg->size = size;
-    
-    msg->header.payload_length = size;
-    msg->header.message_type = packet->get_message_type();
-    msg->header.stream_id = stream_id;
-    msg->header.perfer_cid = packet->get_prefer_cid();
-
-    // donot use the auto free to free the msg,
-    // for performance issue.
-    ret = do_send_messages(&msg, 1);
-    if (ret == ERROR_SUCCESS) {
-        ret = on_send_packet(msg, packet);
-    }
-    srs_freep(msg);
-    
     return ret;
 }
 
@@ -1698,7 +1767,15 @@ int SrsProtocol::response_acknowledgement_message()
     SrsAcknowledgementPacket* pkt = new SrsAcknowledgementPacket();
     in_ack_size.acked_size = skt->get_recv_bytes();
     pkt->sequence_number = (int32_t)in_ack_size.acked_size;
-    if ((ret = send_and_free_packet(pkt, 0)) != ERROR_SUCCESS) {
+    
+    // cache the message and use flush to send.
+    if (!auto_response_when_recv) {
+        manual_response_queue.push_back(pkt);
+        return ret;
+    }
+    
+    // use underlayer api to send, donot flush again.
+    if ((ret = do_send_and_free_packet(pkt, 0)) != ERROR_SUCCESS) {
         srs_error("send acknowledgement failed. ret=%d", ret);
         return ret;
     }
@@ -1718,7 +1795,14 @@ int SrsProtocol::response_ping_message(int32_t timestamp)
     pkt->event_type = SrcPCUCPingResponse;
     pkt->event_data = timestamp;
     
-    if ((ret = send_and_free_packet(pkt, 0)) != ERROR_SUCCESS) {
+    // cache the message and use flush to send.
+    if (!auto_response_when_recv) {
+        manual_response_queue.push_back(pkt);
+        return ret;
+    }
+    
+    // use underlayer api to send, donot flush again.
+    if ((ret = do_send_and_free_packet(pkt, 0)) != ERROR_SUCCESS) {
         srs_error("send ping response failed. ret=%d", ret);
         return ret;
     }

@@ -31,6 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core.hpp>
 
 #include <map>
+#include <vector>
 #include <string>
 
 // for srs-librtmp, @see https://github.com/winlinvip/simple-rtmp-server/issues/213
@@ -213,6 +214,16 @@ private:
     * input ack size, when to send the acked packet.
     */
     AckWindowSize in_ack_size;
+    /**
+    * whether auto response when recv messages.
+    * default to true for it's very easy to use the protocol stack.
+    * @see: https://github.com/winlinvip/simple-rtmp-server/issues/217
+    */
+    bool auto_response_when_recv;
+    /**
+    * when not auto response message, manual flush the messages in queue.
+    */
+    std::vector<SrsPacket*> manual_response_queue;
 // peer out
 private:
     /**
@@ -246,6 +257,20 @@ public:
     virtual ~SrsProtocol();
 public:
     /**
+    * set the auto response message when recv for protocol stack.
+    * @param v, whether auto response message when recv message.
+    * @see: https://github.com/winlinvip/simple-rtmp-server/issues/217
+    */
+    virtual void set_auto_response(bool v);
+    /**
+    * flush for manual response when the auto response is disabled
+    * by set_auto_response(false), we default use auto response, so donot
+    * need to call this api(the protocol sdk will auto send message).
+    * @see the auto_response_when_recv and manual_response_queue.
+    */
+    virtual int manual_response_flush();
+public:
+    /**
     * set/get the recv timeout in us.
     * if timeout, recv/send message return ERROR_SOCKET_TIMEOUT.
     */
@@ -371,6 +396,10 @@ private:
     */
     virtual int do_send_messages(SrsMessage** msgs, int nb_msgs);
     /**
+    * underlayer api for send and free packet.
+    */
+    virtual int do_send_and_free_packet(SrsPacket* packet, int stream_id);
+    /**
     * generate the chunk header for msg.
     * @param mh, the header of msg to send.
     * @param c0, whether the first chunk, the c0 chunk.