for bug #194, use play fd poll, create the singleton poll

@@ -388,7 +388,8 @@ if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
             "srs_app_thread" "srs_app_bandwidth" "srs_app_st" "srs_app_log" "srs_app_config" 
             "srs_app_pithy_print" "srs_app_reload" "srs_app_http_api" "srs_app_http_conn" "srs_app_http_hooks" 
             "srs_app_json" "srs_app_ingest" "srs_app_ffmpeg" "srs_app_utility" "srs_app_dvr" "srs_app_edge"
-            "srs_app_kbps" "srs_app_heartbeat" "srs_app_empty" "srs_app_http_client" "srs_app_avc_aac")
+            "srs_app_kbps" "srs_app_heartbeat" "srs_app_empty" "srs_app_http_client" "srs_app_avc_aac"
+            "srs_app_poll")
     APP_INCS="src/app"; MODULE_DIR=${APP_INCS} . auto/modules.sh
     APP_OBJS="${MODULE_OBJS[@]}"
 fi

+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <srs_app_poll.hpp>
+
+#include <srs_kernel_error.hpp>
+
+SrsPoll::SrsPoll()
+{
+    pthread = new SrsThread(this, 0, false);
+}
+
+SrsPoll::~SrsPoll()
+{
+    srs_freep(pthread);
+    fds.clear();
+}
+
+int SrsPoll::start()
+{
+    return pthread->start();
+}
+
+int SrsPoll::cycle()
+{
+    int ret = ERROR_SUCCESS;
+    // TODO: FIXME: implements it.
+    return ret;
+}
+
+SrsPoll* SrsPoll::_instance = new SrsPoll();
+
+SrsPoll* SrsPoll::instance()
+{
+    return _instance;
+}
+
+SrsPollFD::SrsPollFD()
+{
+    _stfd = NULL;
+}
+
+SrsPollFD::~SrsPollFD()
+{
+}
+
+int SrsPollFD::initialize(st_netfd_t stfd)
+{
+    int ret = ERROR_SUCCESS;
+    
+    _stfd = stfd;
+    
+    return ret;
+}
+

+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef SRS_APP_POLL_HPP
+#define SRS_APP_POLL_HPP
+
+/*
+#include <srs_app_poll.hpp>
+*/
+
+#include <srs_core.hpp>
+
+#include <map>
+
+#include <srs_app_st.hpp>
+#include <srs_app_thread.hpp>
+
+class SrsPollFD;
+
+/**
+* the poll for all play clients to finger the active fd out.
+* for performance issue, @see: https://github.com/winlinvip/simple-rtmp-server/issues/194
+* the poll is shared by all SrsPollFD, and we start an isolate thread to finger the active fds.
+*/
+class SrsPoll : public ISrsThreadHandler
+{
+private:
+    SrsThread* pthread;
+    std::map<st_netfd_t, SrsPollFD*> fds;
+public:
+    SrsPoll();
+    virtual ~SrsPoll();
+public:
+    /**
+    * start the poll thread.
+    */
+    virtual int start();
+    /**
+    * start an cycle thread.
+    */
+    virtual int cycle();
+// singleton
+private:
+    static SrsPoll* _instance;
+public:
+    static SrsPoll* instance();
+};
+
+/**
+* the poll fd to check whether the specified fd is active.
+*/
+class SrsPollFD
+{
+private:
+    st_netfd_t _stfd;
+public:
+    SrsPollFD();
+    virtual ~SrsPollFD();
+public:
+    /**
+    * initialize the poll.
+    * @param stfd the fd to poll.
+    */
+    virtual int initialize(st_netfd_t stfd);
+};
+
+#endif
+

@@ -48,6 +48,7 @@ using namespace std;
 #include <srs_app_utility.hpp>
 #include <srs_protocol_msg_array.hpp>
 #include <srs_protocol_amf0.hpp>
+#include <srs_app_poll.hpp>
 
 // when stream is busy, for example, streaming is already
 // publishing, when a new client to request to publish,
@@ -525,6 +526,11 @@ int SrsRtmpConn::playing(SrsSource* source)
     bool user_specified_duration_to_stop = (req->duration > 0);
     int64_t starttime = -1;
     
+    SrsPollFD poll;
+    if ((ret = poll.initialize(stfd)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     while (true) {
         // collect elapse for pithy print.
         pithy_print.elapse();

@@ -44,6 +44,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_app_source.hpp>
 #include <srs_app_utility.hpp>
 #include <srs_app_heartbeat.hpp>
+#include <srs_app_poll.hpp>
 
 // signal defines.
 #define SIGNAL_RELOAD SIGHUP
@@ -664,6 +665,14 @@ int SrsServer::do_cycle()
 {
     int ret = ERROR_SUCCESS;
     
+    // start the poll for play clients.
+    // performance issue, @see: https://github.com/winlinvip/simple-rtmp-server/issues/194
+    SrsPoll* poll = SrsPoll::instance();
+    if ((ret = poll->start()) != ERROR_SUCCESS) {
+        srs_error("start poll failed. ret=%d", ret);
+        return ret;
+    }
+    
     // find the max loop
     int max = srs_max(0, SRS_SYS_TIME_RESOLUTION_MS_TIMES);
     

@@ -92,6 +92,8 @@ file
 	..\app\srs_app_kbps.cpp,
 	..\app\srs_app_log.hpp,
 	..\app\srs_app_log.cpp,
+	..\app\srs_app_poll.hpp,
+	..\app\srs_app_poll.cpp,
 	..\app\srs_app_refer.hpp,
 	..\app\srs_app_refer.cpp,
 	..\app\srs_app_reload.hpp,