diff --git a/trunk/src/app/srs_app_async_call.cpp b/trunk/src/app/srs_app_async_call.cpp
index 882331e78..c3a30d288 100644
--- a/trunk/src/app/srs_app_async_call.cpp
+++ b/trunk/src/app/srs_app_async_call.cpp
@@ -28,9 +28,6 @@ using namespace std;
 #include <srs_kernel_error.hpp>
 #include <srs_kernel_log.hpp>
 
-// the sleep interval in ms for http async callback.
-#define SRS_AUTO_ASYNC_CALLBACL_CIMS 30
-
 ISrsAsyncCallTask::ISrsAsyncCallTask()
 {
 }
@@ -41,13 +38,13 @@ ISrsAsyncCallTask::~ISrsAsyncCallTask()
 
 SrsAsyncCallWorker::SrsAsyncCallWorker()
 {
-    pthread = new SrsReusableThread("async", this, SRS_AUTO_ASYNC_CALLBACL_CIMS);
+    trd = NULL;
     wait = st_cond_new();
 }
 
 SrsAsyncCallWorker::~SrsAsyncCallWorker()
 {
-    srs_freep(pthread);
+    srs_freep(trd);
     
     std::vector<ISrsAsyncCallTask*>::iterator it;
     for (it = tasks.begin(); it != tasks.end(); ++it) {
@@ -76,29 +73,31 @@ int SrsAsyncCallWorker::count()
 
 int SrsAsyncCallWorker::start()
 {
-    return pthread->start();
+    srs_freep(trd);
+    trd = new SrsCoroutine("async", this, _srs_context->get_id());
+    return trd->start();
 }
 
 void SrsAsyncCallWorker::stop()
 {
     st_cond_signal(wait);
-    pthread->stop();
+    trd->stop();
 }
 
 int SrsAsyncCallWorker::cycle()
 {
     int ret = ERROR_SUCCESS;
     
-    while (pthread->can_loop()) {
+    while (!trd->pull()) {
         if (tasks.empty()) {
             st_cond_wait(wait);
         }
         
-        std::vector<ISrsAsyncCallTask*> copies = tasks;
+        std::vector<ISrsAsyncCallTask*> copy = tasks;
         tasks.clear();
         
         std::vector<ISrsAsyncCallTask*>::iterator it;
-        for (it = copies.begin(); it != copies.end(); ++it) {
+        for (it = copy.begin(); it != copy.end(); ++it) {
             ISrsAsyncCallTask* task = *it;
             if ((ret = task->call()) != ERROR_SUCCESS) {
                 srs_warn("ignore async callback %s, ret=%d", task->to_string().c_str(), ret);
diff --git a/trunk/src/app/srs_app_async_call.hpp b/trunk/src/app/srs_app_async_call.hpp
index 2da094cab..0d303dfc5 100644
--- a/trunk/src/app/srs_app_async_call.hpp
+++ b/trunk/src/app/srs_app_async_call.hpp
@@ -63,10 +63,10 @@ public:
  * when worker call with the task, the worker will do it in isolate thread.
  * that is, the task is execute/call in async mode.
  */
-class SrsAsyncCallWorker : public ISrsReusableThreadHandler
+class SrsAsyncCallWorker : public ISrsCoroutineHandler
 {
 private:
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
 protected:
     std::vector<ISrsAsyncCallTask*> tasks;
     st_cond_t wait;
diff --git a/trunk/src/app/srs_app_encoder.cpp b/trunk/src/app/srs_app_encoder.cpp
index 5f5378658..d4021b0a3 100644
--- a/trunk/src/app/srs_app_encoder.cpp
+++ b/trunk/src/app/srs_app_encoder.cpp
@@ -36,15 +36,12 @@ using namespace std;
 
 #ifdef SRS_AUTO_TRANSCODE
 
-// when error, encoder sleep for a while and retry.
-#define SRS_RTMP_ENCODER_CIMS (3000)
-
 // for encoder to detect the dead loop
 static std::vector<std::string> _transcoded_url;
 
 SrsEncoder::SrsEncoder()
 {
-    pthread = new SrsReusableThread("encoder", this, SRS_RTMP_ENCODER_CIMS);
+    trd = NULL;
     pprint = SrsPithyPrint::create_encoder();
 }
 
@@ -52,7 +49,7 @@ SrsEncoder::~SrsEncoder()
 {
     on_unpublish();
     
-    srs_freep(pthread);
+    srs_freep(trd);
     srs_freep(pprint);
 }
 
@@ -76,24 +73,35 @@ int SrsEncoder::on_publish(SrsRequest* req)
     }
     
     // start thread to run all encoding engines.
-    if ((ret = pthread->start()) != ERROR_SUCCESS) {
+    srs_freep(trd);
+    trd = new SrsCoroutine("encoder", this, _srs_context->get_id());
+    if ((ret = trd->start()) != ERROR_SUCCESS) {
         srs_error("st_thread_create failed. ret=%d", ret);
         return ret;
     }
-    srs_trace("encoder thread cid=%d, current_cid=%d", pthread->cid(), _srs_context->get_id());
     
     return ret;
 }
 
 void SrsEncoder::on_unpublish()
 {
-    pthread->stop();
+    trd->stop();
     clear_engines();
 }
 
+// when error, encoder sleep for a while and retry.
+#define SRS_RTMP_ENCODER_CIMS (3000)
+
 int SrsEncoder::cycle()
 {
-    int ret = do_cycle();
+    int ret = ERROR_SUCCESS;
+    
+    while (!trd->pull()) {
+        if ((ret = do_cycle()) != ERROR_SUCCESS) {
+            srs_warn("Encoder: Ignore error, ret=%d", ret);
+        }
+        st_usleep(SRS_RTMP_ENCODER_CIMS * 1000);
+    }
     
     // kill ffmpeg when finished and it alive
     std::vector<SrsFFMPEG*>::iterator it;
diff --git a/trunk/src/app/srs_app_encoder.hpp b/trunk/src/app/srs_app_encoder.hpp
index cc68c3e13..ba83483d3 100644
--- a/trunk/src/app/srs_app_encoder.hpp
+++ b/trunk/src/app/srs_app_encoder.hpp
@@ -42,13 +42,13 @@ class SrsFFMPEG;
  * the encoder for a stream,
  * may use multiple ffmpegs to transcode the specified stream.
  */
-class SrsEncoder : public ISrsReusableThreadHandler
+class SrsEncoder : public ISrsCoroutineHandler
 {
 private:
     std::string input_stream_name;
     std::vector<SrsFFMPEG*> ffmpegs;
 private:
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
     SrsPithyPrint* pprint;
 public:
     SrsEncoder();
diff --git a/trunk/src/app/srs_app_ingest.cpp b/trunk/src/app/srs_app_ingest.cpp
index b3f6d772d..562f4a2fb 100644
--- a/trunk/src/app/srs_app_ingest.cpp
+++ b/trunk/src/app/srs_app_ingest.cpp
@@ -37,10 +37,6 @@ using namespace std;
 #include <srs_app_utility.hpp>
 #include <srs_protocol_utility.hpp>
 
-// when error, ingester sleep for a while and retry.
-// ingest never sleep a long time, for we must start the stream ASAP.
-#define SRS_AUTO_INGESTER_CIMS (3000)
-
 SrsIngesterFFMPEG::SrsIngesterFFMPEG()
 {
     ffmpeg = NULL;
@@ -109,7 +105,7 @@ SrsIngester::SrsIngester()
     
     expired = false;
     
-    pthread = new SrsReusableThread("ingest", this, SRS_AUTO_INGESTER_CIMS);
+    trd = NULL;
     pprint = SrsPithyPrint::create_ingester();
 }
 
@@ -117,7 +113,7 @@ SrsIngester::~SrsIngester()
 {
     _srs_config->unsubscribe(this);
     
-    srs_freep(pthread);
+    srs_freep(trd);
     clear_engines();
 }
 
@@ -144,18 +140,19 @@ int SrsIngester::start()
     // for the reload may add more ingesters.
     
     // start thread to run all encoding engines.
-    if ((ret = pthread->start()) != ERROR_SUCCESS) {
+    srs_freep(trd);
+    trd = new SrsCoroutine("ingest", this, _srs_context->get_id());
+    if ((ret = trd->start()) != ERROR_SUCCESS) {
         srs_error("st_thread_create failed. ret=%d", ret);
         return ret;
     }
-    srs_trace("ingest thread cid=%d, current_cid=%d", pthread->cid(), _srs_context->get_id());
     
     return ret;
 }
 
 void SrsIngester::stop()
 {
-    pthread->stop();
+    trd->stop();
     clear_engines();
 }
 
@@ -172,10 +169,28 @@ void SrsIngester::fast_stop()
     }
 }
 
+// when error, ingester sleep for a while and retry.
+// ingest never sleep a long time, for we must start the stream ASAP.
+#define SRS_AUTO_INGESTER_CIMS (3000)
+
 int SrsIngester::cycle()
 {
     int ret = ERROR_SUCCESS;
     
+    while (!trd->pull()) {
+        if ((ret = do_cycle()) != ERROR_SUCCESS) {
+            srs_warn("Ingester: Ignore error, ret=%d", ret);
+        }
+        st_usleep(SRS_AUTO_INGESTER_CIMS * 1000);
+    }
+    
+    return ret;
+}
+
+int SrsIngester::do_cycle()
+{
+    int ret = ERROR_SUCCESS;
+    
     // when expired, restart all ingesters.
     if (expired) {
         expired = false;
diff --git a/trunk/src/app/srs_app_ingest.hpp b/trunk/src/app/srs_app_ingest.hpp
index a40d27af0..a4f5ca9a4 100644
--- a/trunk/src/app/srs_app_ingest.hpp
+++ b/trunk/src/app/srs_app_ingest.hpp
@@ -71,12 +71,12 @@ public:
  * encode with FFMPEG(optional),
  * push to SRS(or any RTMP server) over RTMP.
  */
-class SrsIngester : public ISrsReusableThreadHandler, public ISrsReloadHandler
+class SrsIngester : public ISrsCoroutineHandler, public ISrsReloadHandler
 {
 private:
     std::vector<SrsIngesterFFMPEG*> ingesters;
 private:
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
     SrsPithyPrint* pprint;
     // whether the ingesters are expired,
     // for example, the listen port changed,
@@ -95,6 +95,8 @@ private:
 // interface ISrsReusableThreadHandler.
 public:
     virtual int cycle();
+private:
+    virtual int do_cycle();
 private:
     virtual void clear_engines();
     virtual int parse();
diff --git a/trunk/src/app/srs_app_kafka.cpp b/trunk/src/app/srs_app_kafka.cpp
index d832db03f..21d6f753e 100644
--- a/trunk/src/app/srs_app_kafka.cpp
+++ b/trunk/src/app/srs_app_kafka.cpp
@@ -40,7 +40,6 @@ using namespace std;
 
 #ifdef SRS_AUTO_KAFKA
 
-#define SRS_KAKFA_CIMS 3000
 #define SRS_KAFKA_PRODUCER_TIMEOUT 30000
 #define SRS_KAFKA_PRODUCER_AGGREGATE_SIZE 1
 
@@ -366,7 +365,7 @@ SrsKafkaProducer::SrsKafkaProducer()
     metadata_expired = st_cond_new();
     
     lock = st_mutex_new();
-    pthread = new SrsReusableThread("kafka", this, SRS_KAKFA_CIMS);
+    trd = NULL;
     worker = new SrsAsyncCallWorker();
     cache = new SrsKafkaCache();
     
@@ -380,7 +379,7 @@ SrsKafkaProducer::~SrsKafkaProducer()
     srs_freep(lb);
     
     srs_freep(worker);
-    srs_freep(pthread);
+    srs_freep(trd);
     srs_freep(cache);
     
     st_mutex_destroy(lock);
@@ -410,7 +409,9 @@ int SrsKafkaProducer::start()
         return ret;
     }
     
-    if ((ret = pthread->start()) != ERROR_SUCCESS) {
+    srs_freep(trd);
+    trd = new SrsCoroutine("kafka", this, _srs_context->get_id());
+    if ((ret = trd->start()) != ERROR_SUCCESS) {
         srs_error("start kafka thread failed. ret=%d", ret);
     }
     
@@ -425,7 +426,7 @@ void SrsKafkaProducer::stop()
         return;
     }
     
-    pthread->stop();
+    trd->stop();
     worker->stop();
 }
 
@@ -491,12 +492,16 @@ int SrsKafkaProducer::on_close(int key)
     return worker->execute(new SrsKafkaMessage(this, key, obj));
 }
 
+#define SRS_KAKFA_CIMS 3000
 int SrsKafkaProducer::cycle()
 {
     int ret = ERROR_SUCCESS;
     
-    if ((ret = do_cycle()) != ERROR_SUCCESS) {
-        srs_warn("ignore kafka error. ret=%d", ret);
+    while (!trd->pull()) {
+        if ((ret = do_cycle()) != ERROR_SUCCESS) {
+            srs_warn("ignore kafka error. ret=%d", ret);
+        }
+        st_usleep(SRS_KAKFA_CIMS * 1000);
     }
     
     return ret;
diff --git a/trunk/src/app/srs_app_kafka.hpp b/trunk/src/app/srs_app_kafka.hpp
index 919152f3d..ef2dcec1a 100644
--- a/trunk/src/app/srs_app_kafka.hpp
+++ b/trunk/src/app/srs_app_kafka.hpp
@@ -158,13 +158,13 @@ extern void srs_dispose_kafka();
 /**
  * the kafka producer used to save log to kafka cluster.
  */
-class SrsKafkaProducer : virtual public ISrsReusableThreadHandler, virtual public ISrsKafkaCluster
+class SrsKafkaProducer : virtual public ISrsCoroutineHandler, virtual public ISrsKafkaCluster
 {
 private:
     // TODO: FIXME: support reload.
     bool enabled;
     st_mutex_t lock;
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
 private:
     bool metadata_ok;
     st_cond_t metadata_expired;
diff --git a/trunk/src/app/srs_app_listener.cpp b/trunk/src/app/srs_app_listener.cpp
index c897ec138..5b047f2a4 100755
--- a/trunk/src/app/srs_app_listener.cpp
+++ b/trunk/src/app/srs_app_listener.cpp
@@ -79,7 +79,7 @@ SrsUdpListener::SrsUdpListener(ISrsUdpHandler* h, string i, int p)
     nb_buf = SRS_UDP_MAX_PACKET_SIZE;
     buf = new char[nb_buf];
     
-    pthread = new SrsReusableThread("udp", this);
+    trd = NULL;
 }
 
 SrsUdpListener::~SrsUdpListener()
@@ -87,8 +87,7 @@ SrsUdpListener::~SrsUdpListener()
     // close the stfd to trigger thread to interrupted.
     srs_close_stfd(_stfd);
     
-    pthread->stop();
-    srs_freep(pthread);
+    srs_freep(trd);
     
     // st does not close it sometimes,
     // close it manually.
@@ -118,13 +117,8 @@ int SrsUdpListener::listen()
     }
     srs_verbose("create linux socket success. ip=%s, port=%d, fd=%d", ip.c_str(), port, _fd);
     
-    int reuse_socket = 1;
-    if (setsockopt(_fd, SOL_SOCKET, SO_REUSEADDR, &reuse_socket, sizeof(int)) == -1) {
-        ret = ERROR_SOCKET_SETREUSE;
-        srs_error("setsockopt reuse-addr error. ip=%s, port=%d, ret=%d", ip.c_str(), port, ret);
-        return ret;
-    }
-    srs_verbose("setsockopt reuse-addr success. ip=%s, port=%d, fd=%d", ip.c_str(), port, _fd);
+    srs_fd_close_exec(_fd);
+    srs_socket_reuse_addr(_fd);
     
     sockaddr_in addr;
     addr.sin_family = AF_INET;
@@ -144,7 +138,9 @@ int SrsUdpListener::listen()
     }
     srs_verbose("st open socket success. ep=%s:%d, fd=%d", ip.c_str(), port, _fd);
     
-    if ((ret = pthread->start()) != ERROR_SUCCESS) {
+    srs_freep(trd);
+    trd = new SrsCoroutine("udp", this);
+    if ((ret = trd->start()) != ERROR_SUCCESS) {
         srs_error("st_thread_create listen thread error. ep=%s:%d, ret=%d", ip.c_str(), port, ret);
         return ret;
     }
@@ -157,23 +153,25 @@ int SrsUdpListener::cycle()
 {
     int ret = ERROR_SUCCESS;
     
-    // TODO: FIXME: support ipv6, @see man 7 ipv6
-    sockaddr_in from;
-    int nb_from = sizeof(sockaddr_in);
-    int nread = 0;
-    
-    if ((nread = st_recvfrom(_stfd, buf, nb_buf, (sockaddr*)&from, &nb_from, ST_UTIME_NO_TIMEOUT)) <= 0) {
-        srs_warn("ignore recv udp packet failed, nread=%d", nread);
-        return ret;
-    }
-    
-    if ((ret = handler->on_udp_packet(&from, buf, nread)) != ERROR_SUCCESS) {
-        srs_warn("handle udp packet failed. ret=%d", ret);
-        return ret;
-    }
-    
-    if (SRS_UDP_PACKET_RECV_CYCLE_INTERVAL_MS > 0) {
-        st_usleep(SRS_UDP_PACKET_RECV_CYCLE_INTERVAL_MS * 1000);
+    while (!trd->pull()) {
+        // TODO: FIXME: support ipv6, @see man 7 ipv6
+        sockaddr_in from;
+        int nb_from = sizeof(sockaddr_in);
+        int nread = 0;
+        
+        if ((nread = st_recvfrom(_stfd, buf, nb_buf, (sockaddr*)&from, &nb_from, ST_UTIME_NO_TIMEOUT)) <= 0) {
+            srs_warn("ignore recv udp packet failed, nread=%d", nread);
+            return ret;
+        }
+        
+        if ((ret = handler->on_udp_packet(&from, buf, nread)) != ERROR_SUCCESS) {
+            srs_warn("handle udp packet failed. ret=%d", ret);
+            return ret;
+        }
+        
+        if (SRS_UDP_PACKET_RECV_CYCLE_INTERVAL_MS > 0) {
+            st_usleep(SRS_UDP_PACKET_RECV_CYCLE_INTERVAL_MS * 1000);
+        }
     }
     
     return ret;
@@ -188,13 +186,12 @@ SrsTcpListener::SrsTcpListener(ISrsTcpHandler* h, string i, int p)
     _fd = -1;
     _stfd = NULL;
     
-    pthread = new SrsReusableThread("tcp", this);
+    trd = NULL;
 }
 
 SrsTcpListener::~SrsTcpListener()
 {
-    pthread->stop();
-    srs_freep(pthread);
+    srs_freep(trd);
     
     srs_close_stfd(_stfd);
 }
@@ -215,13 +212,8 @@ int SrsTcpListener::listen()
     }
     srs_verbose("create linux socket success. port=%d, fd=%d", port, _fd);
     
-    int reuse_socket = 1;
-    if (setsockopt(_fd, SOL_SOCKET, SO_REUSEADDR, &reuse_socket, sizeof(int)) == -1) {
-        ret = ERROR_SOCKET_SETREUSE;
-        srs_error("setsockopt reuse-addr error. port=%d, ret=%d", port, ret);
-        return ret;
-    }
-    srs_verbose("setsockopt reuse-addr success. port=%d, fd=%d", port, _fd);
+    srs_fd_close_exec(_fd);
+    srs_socket_reuse_addr(_fd);
     
     sockaddr_in addr;
     addr.sin_family = AF_INET;
@@ -248,7 +240,9 @@ int SrsTcpListener::listen()
     }
     srs_verbose("st open socket success. ep=%s:%d, fd=%d", ip.c_str(), port, _fd);
     
-    if ((ret = pthread->start()) != ERROR_SUCCESS) {
+    srs_freep(trd);
+    trd = new SrsCoroutine("tcp", this);
+    if ((ret = trd->start()) != ERROR_SUCCESS) {
         srs_error("st_thread_create listen thread error. ep=%s:%d, ret=%d", ip.c_str(), port, ret);
         return ret;
     }
@@ -261,20 +255,25 @@ int SrsTcpListener::cycle()
 {
     int ret = ERROR_SUCCESS;
     
-    st_netfd_t client_stfd = st_accept(_stfd, NULL, NULL, ST_UTIME_NO_TIMEOUT);
-    
-    if(client_stfd == NULL){
-        // ignore error.
-        if (errno != EINTR) {
-            srs_error("ignore accept thread stoppped for accept client error");
+    while (!trd->pull()) {
+        st_netfd_t stfd = st_accept(_stfd, NULL, NULL, ST_UTIME_NO_TIMEOUT);
+        int fd = st_netfd_fileno(stfd);
+        
+        srs_fd_close_exec(fd);
+        
+        if(stfd == NULL){
+            // ignore error.
+            if (errno != EINTR) {
+                srs_error("ignore accept thread stoppped for accept client error");
+            }
+            return ret;
+        }
+        srs_verbose("get a client. fd=%d", fd);
+        
+        if ((ret = handler->on_tcp_client(stfd)) != ERROR_SUCCESS) {
+            srs_warn("accept client error. ret=%d", ret);
+            return ret;
         }
-        return ret;
-    }
-    srs_verbose("get a client. fd=%d", st_netfd_fileno(client_stfd));
-    
-    if ((ret = handler->on_tcp_client(client_stfd)) != ERROR_SUCCESS) {
-        srs_warn("accept client error. ret=%d", ret);
-        return ret;
     }
     
     return ret;
diff --git a/trunk/src/app/srs_app_listener.hpp b/trunk/src/app/srs_app_listener.hpp
index fc9966229..cad00c87e 100644
--- a/trunk/src/app/srs_app_listener.hpp
+++ b/trunk/src/app/srs_app_listener.hpp
@@ -78,12 +78,12 @@ public:
 /**
  * bind udp port, start thread to recv packet and handler it.
  */
-class SrsUdpListener : public ISrsReusableThreadHandler
+class SrsUdpListener : public ISrsCoroutineHandler
 {
 private:
     int _fd;
     st_netfd_t _stfd;
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
 private:
     char* buf;
     int nb_buf;
@@ -107,12 +107,12 @@ public:
 /**
  * bind and listen tcp port, use handler to process the client.
  */
-class SrsTcpListener : public ISrsReusableThreadHandler
+class SrsTcpListener : public ISrsCoroutineHandler
 {
 private:
     int _fd;
     st_netfd_t _stfd;
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
 private:
     ISrsTcpHandler* handler;
     std::string ip;
diff --git a/trunk/src/app/srs_app_ng_exec.cpp b/trunk/src/app/srs_app_ng_exec.cpp
index dfaef8ecb..7f5e920f6 100644
--- a/trunk/src/app/srs_app_ng_exec.cpp
+++ b/trunk/src/app/srs_app_ng_exec.cpp
@@ -36,12 +36,9 @@ using namespace std;
 #include <srs_kernel_consts.hpp>
 #include <srs_protocol_utility.hpp>
 
-// when error, ng-exec sleep for a while and retry.
-#define SRS_RTMP_EXEC_CIMS (3000)
-
 SrsNgExec::SrsNgExec()
 {
-    pthread = new SrsReusableThread("encoder", this, SRS_RTMP_EXEC_CIMS);
+    trd = NULL;
     pprint = SrsPithyPrint::create_exec();
 }
 
@@ -49,7 +46,7 @@ SrsNgExec::~SrsNgExec()
 {
     on_unpublish();
     
-    srs_freep(pthread);
+    srs_freep(trd);
     srs_freep(pprint);
 }
 
@@ -63,24 +60,34 @@ int SrsNgExec::on_publish(SrsRequest* req)
     }
     
     // start thread to run all processes.
-    if ((ret = pthread->start()) != ERROR_SUCCESS) {
+    srs_freep(trd);
+    trd = new SrsCoroutine("encoder", this, _srs_context->get_id());
+    if ((ret = trd->start()) != ERROR_SUCCESS) {
         srs_error("st_thread_create failed. ret=%d", ret);
         return ret;
     }
-    srs_trace("exec thread cid=%d, current_cid=%d", pthread->cid(), _srs_context->get_id());
     
     return ret;
 }
 
 void SrsNgExec::on_unpublish()
 {
-    pthread->stop();
+    trd->stop();
     clear_exec_publish();
 }
 
+// when error, ng-exec sleep for a while and retry.
+#define SRS_RTMP_EXEC_CIMS (3000)
 int SrsNgExec::cycle()
 {
-    int ret = do_cycle();
+    int ret = ERROR_SUCCESS;
+    
+    while (!trd->pull()) {
+        if ((ret = do_cycle()) != ERROR_SUCCESS) {
+            srs_warn("EXEC: Ignore error, ret=%d", ret);
+        }
+        st_usleep(SRS_RTMP_EXEC_CIMS * 1000);
+    }
     
     std::vector<SrsProcess*>::iterator it;
     for (it = exec_publishs.begin(); it != exec_publishs.end(); ++it) {
diff --git a/trunk/src/app/srs_app_ng_exec.hpp b/trunk/src/app/srs_app_ng_exec.hpp
index 06ac2e01c..1b963e71b 100644
--- a/trunk/src/app/srs_app_ng_exec.hpp
+++ b/trunk/src/app/srs_app_ng_exec.hpp
@@ -40,10 +40,10 @@ class SrsProcess;
  * @see https://github.com/arut/nginx-rtmp-module/wiki/Directives#exec_push
  * @see https://github.com/ossrs/srs/issues/367
  */
-class SrsNgExec : public ISrsReusableThreadHandler
+class SrsNgExec : public ISrsCoroutineHandler
 {
 private:
-    SrsReusableThread* pthread;
+    SrsCoroutine* trd;
     SrsPithyPrint* pprint;
     std::string input_stream_name;
     std::vector<SrsProcess*> exec_publishs;
diff --git a/trunk/src/app/srs_app_st.cpp b/trunk/src/app/srs_app_st.cpp
index 7080d0251..3713d8251 100755
--- a/trunk/src/app/srs_app_st.cpp
+++ b/trunk/src/app/srs_app_st.cpp
@@ -124,8 +124,12 @@ int SrsCoroutine::cid()
 
 int SrsCoroutine::cycle()
 {
-    if (!context && _srs_context) {
-        context = _srs_context->generate_id();
+    if (_srs_context) {
+        if (context) {
+            _srs_context->set_id(context);
+        } else {
+            context = _srs_context->generate_id();
+        }
     }
     srs_info("Thread.cycle: Start with cid=%d, err=%d", context, err);
     
diff --git a/trunk/src/app/srs_app_thread.cpp b/trunk/src/app/srs_app_thread.cpp
index 1fa5668f6..014c69b4b 100755
--- a/trunk/src/app/srs_app_thread.cpp
+++ b/trunk/src/app/srs_app_thread.cpp
@@ -78,89 +78,6 @@ void SrsCoroutineManager::clear()
     }
 }
 
-ISrsReusableThreadHandler::ISrsReusableThreadHandler()
-{
-}
-
-ISrsReusableThreadHandler::~ISrsReusableThreadHandler()
-{
-}
-
-void ISrsReusableThreadHandler::on_thread_start()
-{
-}
-
-int ISrsReusableThreadHandler::on_before_cycle()
-{
-    return ERROR_SUCCESS;
-}
-
-int ISrsReusableThreadHandler::on_end_cycle()
-{
-    return ERROR_SUCCESS;
-}
-
-void ISrsReusableThreadHandler::on_thread_stop()
-{
-}
-
-SrsReusableThread::SrsReusableThread(const char* n, ISrsReusableThreadHandler* h, int64_t cims)
-{
-    handler = h;
-    pthread = new internal::SrsThread(n, this, cims, true);
-}
-
-SrsReusableThread::~SrsReusableThread()
-{
-    pthread->stop();
-    srs_freep(pthread);
-}
-
-int SrsReusableThread::start()
-{
-    return pthread->start();
-}
-
-void SrsReusableThread::stop()
-{
-    pthread->stop();
-}
-
-bool SrsReusableThread::can_loop()
-{
-    return pthread->can_loop();
-}
-
-int SrsReusableThread::cid()
-{
-    return pthread->cid();
-}
-
-int SrsReusableThread::cycle()
-{
-    return handler->cycle();
-}
-
-void SrsReusableThread::on_thread_start()
-{
-    handler->on_thread_start();
-}
-
-int SrsReusableThread::on_before_cycle()
-{
-    return handler->on_before_cycle();
-}
-
-int SrsReusableThread::on_end_cycle()
-{
-    return handler->on_end_cycle();
-}
-
-void SrsReusableThread::on_thread_stop()
-{
-    handler->on_thread_stop();
-}
-
 ISrsReusableThread2Handler::ISrsReusableThread2Handler()
 {
 }
diff --git a/trunk/src/app/srs_app_thread.hpp b/trunk/src/app/srs_app_thread.hpp
index 85feabf8f..ee9983493 100644
--- a/trunk/src/app/srs_app_thread.hpp
+++ b/trunk/src/app/srs_app_thread.hpp
@@ -58,85 +58,6 @@ private:
     void clear();
 };
 
-/**
- * the reuse thread is a thread stop and start by other thread.
- *       user can create thread and stop then start again and again,
- *       generally must provides a start and stop method, @see SrsIngester.
- *       the step to create a thread stop by other thread:
- *       1. create SrsReusableThread field.
- *       2. must manually stop the thread when started it.
- *       for example:
- *           class SrsIngester : public ISrsReusableThreadHandler {
- *               public: SrsIngester() { pthread = new SrsReusableThread("ingest", this, SRS_AUTO_INGESTER_CIMS); }
- *               public: virtual int start() { return pthread->start(); }
- *               public: virtual void stop() { pthread->stop(); }
- *               public: virtual int cycle() {
- *                   // check status, start ffmpeg when stopped.
- *               }
- *           };
- */
-class ISrsReusableThreadHandler
-{
-public:
-    ISrsReusableThreadHandler();
-    virtual ~ISrsReusableThreadHandler();
-public:
-    /**
-     * the cycle method for the one cycle thread.
-     * @remark when the cycle has its inner loop, it must check whether
-     * the thread is interrupted.
-     */
-    virtual int cycle() = 0;
-public:
-    /**
-     * other callback for handler.
-     * @remark all callback is optional, handler can ignore it.
-     */
-    virtual void on_thread_start();
-    virtual int on_before_cycle();
-    virtual int on_end_cycle();
-    virtual void on_thread_stop();
-};
-class SrsReusableThread : public internal::ISrsThreadHandler
-{
-private:
-    internal::SrsThread* pthread;
-    ISrsReusableThreadHandler* handler;
-public:
-    SrsReusableThread(const char* n, ISrsReusableThreadHandler* h, int64_t cims = 0);
-    virtual ~SrsReusableThread();
-public:
-    /**
-     * for the reusable thread, start and stop by user.
-     */
-    virtual int start();
-    /**
-     * stop the thread, wait for the thread to terminate.
-     * @remark user can stop multiple times, ignore if already stopped.
-     */
-    virtual void stop();
-    /**
-     * whether the thread should loop,
-     * used for handler->cycle() which has a loop method,
-     * to check this method, break if false.
-     */
-    virtual bool can_loop();
-public:
-    /**
-     * get the context id. @see: ISrsThreadContext.get_id().
-     * used for parent thread to get the id.
-     * @remark when start thread, parent thread will block and wait for this id ready.
-     */
-    virtual int cid();
-// interface internal::ISrsThreadHandler
-public:
-    virtual int cycle();
-    virtual void on_thread_start();
-    virtual int on_before_cycle();
-    virtual int on_end_cycle();
-    virtual void on_thread_stop();
-};
-
 /**
  * the reuse thread is a thread stop and start by other thread.
  * the version 2, is the thread cycle has its inner loop, which should
diff --git a/trunk/src/service/srs_service_st.cpp b/trunk/src/service/srs_service_st.cpp
index e713f2bfa..d921cf54f 100644
--- a/trunk/src/service/srs_service_st.cpp
+++ b/trunk/src/service/srs_service_st.cpp
@@ -23,6 +23,8 @@
 
 #include <srs_service_st.hpp>
 
+#include <fcntl.h>
+#include <sys/socket.h>
 using namespace std;
 
 #include <srs_kernel_error.hpp>
@@ -88,6 +90,19 @@ void srs_close_stfd(st_netfd_t& stfd)
     }
 }
 
+void srs_fd_close_exec(int fd)
+{
+    int flags = fcntl(fd, F_GETFD);
+    flags |= FD_CLOEXEC;
+    fcntl(fd, F_SETFD, flags);
+}
+
+void srs_socket_reuse_addr(int fd)
+{
+    int v = 1;
+    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(int));
+}
+
 SrsStSocket::SrsStSocket()
 {
     stfd = NULL;
diff --git a/trunk/src/service/srs_service_st.hpp b/trunk/src/service/srs_service_st.hpp
index 281de85e4..1faf95373 100644
--- a/trunk/src/service/srs_service_st.hpp
+++ b/trunk/src/service/srs_service_st.hpp
@@ -38,6 +38,12 @@ extern int srs_st_init();
 // @remark when close, user must ensure io completed.
 extern void srs_close_stfd(st_netfd_t& stfd);
 
+// Set the FD_CLOEXEC of FD.
+extern void srs_fd_close_exec(int fd);
+
+// Set the SO_REUSEADDR of socket.
+extern void srs_socket_reuse_addr(int fd);
+
 /**
  * the socket provides TCP socket over st,
  * that is, the sync socket mechanism.
diff --git a/trunk/src/service/srs_service_utility.cpp b/trunk/src/service/srs_service_utility.cpp
index e3454782a..2d36d2387 100644
--- a/trunk/src/service/srs_service_utility.cpp
+++ b/trunk/src/service/srs_service_utility.cpp
@@ -56,6 +56,8 @@ int srs_socket_connect(string server, int port, int64_t tm, st_netfd_t* pstfd)
         return ret;
     }
     
+    srs_fd_close_exec(sock);
+    
     srs_assert(!stfd);
     stfd = st_netfd_open_socket(sock);
     if(stfd == NULL){