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

trunk/src/app/srs_app_poll.hpp

@@ -0,0 +1,88 @@
+/*
+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
+