add srs pipe for bug #194

@@ -388,7 +388,8 @@ if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
             "srs_app_thread" "srs_app_bandwidth" "srs_app_st" "srs_app_log" "srs_app_config" 
             "srs_app_thread" "srs_app_bandwidth" "srs_app_st" "srs_app_log" "srs_app_config" 
             "srs_app_pithy_print" "srs_app_reload" "srs_app_http_api" "srs_app_http_conn" "srs_app_http_hooks" 
             "srs_app_pithy_print" "srs_app_reload" "srs_app_http_api" "srs_app_http_conn" "srs_app_http_hooks" 
             "srs_app_json" "srs_app_ingest" "srs_app_ffmpeg" "srs_app_utility" "srs_app_dvr" "srs_app_edge"
             "srs_app_json" "srs_app_ingest" "srs_app_ffmpeg" "srs_app_utility" "srs_app_dvr" "srs_app_edge"
-            "srs_app_kbps" "srs_app_heartbeat" "srs_app_empty" "srs_app_http_client" "srs_app_avc_aac")
+            "srs_app_kbps" "srs_app_heartbeat" "srs_app_empty" "srs_app_http_client" "srs_app_avc_aac"
+            "srs_app_pipe")
     APP_INCS="src/app"; MODULE_DIR=${APP_INCS} . auto/modules.sh
     APP_INCS="src/app"; MODULE_DIR=${APP_INCS} . auto/modules.sh
     APP_OBJS="${MODULE_OBJS[@]}"
     APP_OBJS="${MODULE_OBJS[@]}"
 fi
 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_pipe.hpp>
+
+#include <unistd.h>
+
+#include <srs_kernel_error.hpp>
+#include <srs_kernel_log.hpp>
+
+SrsPipe::SrsPipe()
+{
+    fds[0] = fds[1] = 0;
+    read_stfd = write_stfd = NULL;
+    _already_written = false;
+}
+
+SrsPipe::~SrsPipe()
+{
+    srs_close_stfd(read_stfd);
+    srs_close_stfd(write_stfd);
+}
+
+int SrsPipe::initialize()
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (pipe(fds) < 0) {
+        ret = ERROR_SYSTEM_CREATE_PIPE;
+        srs_error("create pipe failed. ret=%d", ret);
+        return ret;
+    }
+    
+    if ((read_stfd = st_netfd_open(fds[0])) == NULL) {
+        ret = ERROR_SYSTEM_CREATE_PIPE;
+        srs_error("open read pipe failed. ret=%d", ret);
+        return ret;
+    }
+    
+    if ((write_stfd = st_netfd_open(fds[1])) == NULL) {
+        ret = ERROR_SYSTEM_CREATE_PIPE;
+        srs_error("open write pipe failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+bool SrsPipe::already_written()
+{
+    return _already_written;
+}
+
+int SrsPipe::active()
+{
+    int ret = ERROR_SUCCESS;
+    
+    int v = 0;
+    if (st_write(read_stfd, &v, sizeof(int), ST_UTIME_NO_TIMEOUT) != sizeof(int)) {
+        ret = ERROR_SYSTEM_WRITE_PIPE;
+        srs_error("write pipe failed. ret=%d", ret);
+        return ret;
+    }
+    
+    _already_written = true;
+    
+    return ret;
+}
+
+int SrsPipe::reset()
+{
+    int ret = ERROR_SUCCESS;
+    
+    int v;
+    if (st_read(read_stfd, &v, sizeof(int), ST_UTIME_NO_TIMEOUT) != sizeof(int)) {
+        ret = ERROR_SYSTEM_READ_PIPE;
+        srs_error("read pipe failed. ret=%d", ret);
+        return ret;
+    }
+    
+    _already_written = false;
+    
+    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_PIPE_HPP
+#define SRS_APP_PIPE_HPP
+
+/*
+#include <srs_app_pipe.hpp>
+*/
+
+#include <srs_core.hpp>
+
+#include <srs_app_st.hpp>
+
+/**
+* convert something to io, 
+* for example, signal or SrsConsumer event.
+* for performance issue, @see: https://github.com/winlinvip/simple-rtmp-server/issues/194
+*/
+class SrsPipe
+{
+private:
+    int fds[2];
+    st_netfd_t read_stfd;
+    st_netfd_t write_stfd;
+    /**
+    * for the event based service, 
+    * for example, the consumer only care whether there is data writen in pipe,
+    * and the source will not write to pipe when pipe is already writen.
+    */
+    bool _already_written;
+public:
+    SrsPipe();
+    virtual ~SrsPipe();
+public:
+    /**
+    * initialize pipes, open fds.
+    */
+    virtual int initialize();
+public:
+    /**
+    * for event based service, whether already writen data.
+    */
+    virtual bool already_written();
+    /**
+    * for event based service, 
+    * write an int to pipe and set the pipe to active.
+    */
+    virtual int active();
+    /**
+    * for event based service,
+    * read an int from pipe and reset the pipe to deactive.
+    */
+    virtual int reset();
+};
+
+#endif
+

@@ -88,6 +88,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_SYSTEM_FILE_SEEK              1049
 #define ERROR_SYSTEM_FILE_SEEK              1049
 #define ERROR_SYSTEM_IO_INVALID             1050
 #define ERROR_SYSTEM_IO_INVALID             1050
 #define ERROR_ST_EXCEED_THREADS             1051
 #define ERROR_ST_EXCEED_THREADS             1051
+#define ERROR_SYSTEM_READ_PIPE              1052
+#define ERROR_SYSTEM_WRITE_PIPE             1053
 
 
 ///////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////
 // RTMP protocol error.
 // RTMP protocol error.

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