src/thread_pool_observer.cpp

   1
   2 /* $Id: thread_pool_observer.cpp,v 1.10 2005-11-07 12:31:05 adam Exp $
   3    Copyright (c) 2005, Index Data.
   4
   5 %LICENSE%
   6  */
   7 #include "config.hpp"
   8
   9 #if HAVE_UNISTD_H
  10 #include <unistd.h>
  11 #endif
  12 #ifdef WIN32
  13 #include <winsock.h>
  14 #endif
  15
  16 #include <boost/thread/thread.hpp>
  17 #include <boost/thread/mutex.hpp>
  18 #include <boost/thread/condition.hpp>
  19
  20 #include <ctype.h>
  21 #include <stdio.h>
  22
  23 #include <deque>
  24
  25 #include <yaz++/socket-observer.h>
  26 #include <yaz/log.h>
  27
  28 #include "thread_pool_observer.hpp"
  29
  30 namespace yp2 {
  31     class ThreadPoolSocketObserver::Worker {
  32     public:
  33         Worker(ThreadPoolSocketObserver *s) : m_s(s) {};
  34         ThreadPoolSocketObserver *m_s;
  35         void operator() (void) {
  36             m_s->run(0);
  37         }
  38     };
  39
  40     class ThreadPoolSocketObserver::Rep : public boost::noncopyable {
  41         friend class ThreadPoolSocketObserver;
  42     public:
  43         Rep(yazpp_1::ISocketObservable *obs);
  44         ~Rep();
  45     private:
  46         yazpp_1::ISocketObservable *m_socketObservable;
  47         int m_fd[2];
  48         boost::thread_group m_thrds;
  49         boost::mutex m_mutex_input_data;
  50         boost::condition m_cond_input_data;
  51         boost::mutex m_mutex_output_data;
  52         std::deque<IThreadPoolMsg *> m_input;
  53         std::deque<IThreadPoolMsg *> m_output;
  54         bool m_stop_flag;
  55         int m_no_threads;
  56     };
  57 }
  58
  59
  60 using namespace yazpp_1;
  61 using namespace yp2;
  62
  63 ThreadPoolSocketObserver::Rep::Rep(ISocketObservable *obs)
  64     : m_socketObservable(obs)
  65 {
  66 }
  67
  68 ThreadPoolSocketObserver::Rep::~Rep()
  69 {
  70 }
  71
  72 IThreadPoolMsg::~IThreadPoolMsg()
  73 {
  74
  75 }
  76
  77 ThreadPoolSocketObserver::ThreadPoolSocketObserver(ISocketObservable *obs,
  78                                                    int no_threads)
  79     : m_p(new Rep(obs))
  80 {
  81     pipe(m_p->m_fd);
  82     obs->addObserver(m_p->m_fd[0], this);
  83     obs->maskObserver(this, SOCKET_OBSERVE_READ);
  84
  85     m_p->m_stop_flag = false;
  86     m_p->m_no_threads = no_threads;
  87     int i;
  88     for (i = 0; i<no_threads; i++)
  89     {
  90         Worker w(this);
  91         m_p->m_thrds.add_thread(new boost::thread(w));
  92     }
  93 }
  94
  95 ThreadPoolSocketObserver::~ThreadPoolSocketObserver()
  96 {
  97     {
  98         boost::mutex::scoped_lock input_lock(m_p->m_mutex_input_data);
  99         m_p->m_stop_flag = true;
 100         m_p->m_cond_input_data.notify_all();
 101     }
 102     m_p->m_thrds.join_all();
 103
 104     m_p->m_socketObservable->deleteObserver(this);
 105
 106     close(m_p->m_fd[0]);
 107     close(m_p->m_fd[1]);
 108 }
 109
 110 void ThreadPoolSocketObserver::socketNotify(int event)
 111 {
 112     if (event & SOCKET_OBSERVE_READ)
 113     {
 114         char buf[2];
 115         read(m_p->m_fd[0], buf, 1);
 116         IThreadPoolMsg *out;
 117         {
 118             boost::mutex::scoped_lock output_lock(m_p->m_mutex_output_data);
 119             out = m_p->m_output.front();
 120             m_p->m_output.pop_front();
 121         }
 122         if (out)
 123             out->result();
 124     }
 125 }
 126
 127 void ThreadPoolSocketObserver::run(void *p)
 128 {
 129     while(1)
 130     {
 131         IThreadPoolMsg *in = 0;
 132         {
 133             boost::mutex::scoped_lock input_lock(m_p->m_mutex_input_data);
 134             while (!m_p->m_stop_flag && m_p->m_input.size() == 0)
 135                 m_p->m_cond_input_data.wait(input_lock);
 136             if (m_p->m_stop_flag)
 137                 break;
 138
 139             in = m_p->m_input.front();
 140             m_p->m_input.pop_front();
 141         }
 142         IThreadPoolMsg *out = in->handle();
 143         {
 144             boost::mutex::scoped_lock output_lock(m_p->m_mutex_output_data);
 145             m_p->m_output.push_back(out);
 146             write(m_p->m_fd[1], "", 1);
 147         }
 148     }
 149 }
 150
 151 void ThreadPoolSocketObserver::put(IThreadPoolMsg *m)
 152 {
 153     boost::mutex::scoped_lock input_lock(m_p->m_mutex_input_data);
 154     m_p->m_input.push_back(m);
 155     m_p->m_cond_input_data.notify_one();
 156 }
 157 /*
 158  * Local variables:
 159  * c-basic-offset: 4
 160  * indent-tabs-mode: nil
 161  * c-file-style: "stroustrup"
 162  * End:
 163  * vim: shiftwidth=4 tabstop=8 expandtab
 164  */
 165