frontend_net: dynamic thread pool MP-629

[metaproxy-moved-to-github.git] / src / thread_pool_observer.cpp

diff --git a/src/thread_pool_observer.cpp b/src/thread_pool_observer.cpp
index a52cd92..bf60e73 100644 (file)
--- a/src/thread_pool_observer.cpp
+++ b/src/thread_pool_observer.cpp
@@ -69,7 +69,9 @@ namespace metaproxy_1 {
         std::deque<IThreadPoolMsg *> m_output;
         bool m_stop_flag;
         unsigned m_no_threads;
-        unsigned m_no_threads_waiting;
+        unsigned m_min_threads;
+        unsigned m_max_threads;
+        unsigned m_waiting_threads;
     };
     const unsigned int queue_size_per_thread = 64;
 }
@@ -94,17 +96,19 @@ IThreadPoolMsg::~IThreadPoolMsg()
 }
 
 ThreadPoolSocketObserver::ThreadPoolSocketObserver(
-    yazpp_1::ISocketObservable *obs, int no_threads)
+    yazpp_1::ISocketObservable *obs,
+    unsigned min_threads, unsigned max_threads)
     : m_p(new Rep(obs))
 {
     obs->addObserver(m_p->m_pipe.read_fd(), this);
     obs->maskObserver(this, SOCKET_OBSERVE_READ);
 
     m_p->m_stop_flag = false;
-    m_p->m_no_threads = no_threads;
-    m_p->m_no_threads_waiting = 0;
-    int i;
-    for (i = 0; i<no_threads; i++)
+    m_p->m_min_threads = m_p->m_no_threads = min_threads;
+    m_p->m_max_threads = max_threads;
+    m_p->m_waiting_threads = 0;
+    unsigned i;
+    for (i = 0; i < m_p->m_no_threads; i++)
     {
         Worker w(this);
         m_p->m_thrds.add_thread(new boost::thread(w));
@@ -119,7 +123,6 @@ ThreadPoolSocketObserver::~ThreadPoolSocketObserver()
         m_p->m_cond_input_data.notify_all();
     }
     m_p->m_thrds.join_all();
-
     m_p->m_socketObservable->deleteObserver(this);
 }
 
@@ -148,15 +151,13 @@ void ThreadPoolSocketObserver::socketNotify(int event)
             out = m_p->m_output.front();
             m_p->m_output.pop_front();
         }
-
-
         if (out)
         {
             std::ostringstream os;
             {
                 boost::mutex::scoped_lock input_lock(m_p->m_mutex_input_data);
                 os  << "tbusy/total " <<
-                    m_p->m_no_threads - m_p->m_no_threads_waiting <<
+                    m_p->m_no_threads - m_p->m_waiting_threads <<
                     "/" << m_p->m_no_threads
                     << " queue in/out " << m_p->m_input.size() << "/"
                     << m_p->m_output.size();
@@ -168,7 +169,7 @@ void ThreadPoolSocketObserver::socketNotify(int event)
 
 void ThreadPoolSocketObserver::get_thread_info(int &tbusy, int &total)
 {
-    tbusy = m_p->m_no_threads - m_p->m_no_threads_waiting;
+    tbusy = m_p->m_no_threads - m_p->m_waiting_threads;
     total = m_p->m_no_threads;
 }
 
@@ -179,10 +180,10 @@ void ThreadPoolSocketObserver::run(void *p)
         IThreadPoolMsg *in = 0;
         {
             boost::mutex::scoped_lock input_lock(m_p->m_mutex_input_data);
-            m_p->m_no_threads_waiting++;
+            m_p->m_waiting_threads++;
             while (!m_p->m_stop_flag && m_p->m_input.size() == 0)
                 m_p->m_cond_input_data.wait(input_lock);
-            m_p->m_no_threads_waiting--;
+            m_p->m_waiting_threads--;
             if (m_p->m_stop_flag)
                 break;
 
@@ -232,7 +233,13 @@ void ThreadPoolSocketObserver::cleanup(IThreadPoolMsg *m, void *info)
 void ThreadPoolSocketObserver::put(IThreadPoolMsg *m)
 {
     boost::mutex::scoped_lock input_lock(m_p->m_mutex_input_data);
-
+    if (m_p->m_waiting_threads == 0 &&
+        m_p->m_no_threads < m_p->m_max_threads)
+    {
+        m_p->m_no_threads++;
+        Worker w(this);
+        m_p->m_thrds.add_thread(new boost::thread(w));
+    }
     while (m_p->m_input.size() >= m_p->m_no_threads * queue_size_per_thread)
         m_p->m_cond_input_full.wait(input_lock);
     m_p->m_input.push_back(m);