src/threadengines/threadengine_pthread.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "threadengines/threadengine_pthread.h"
  16 #include <pthread.h>
  17 #include <signal.h>
  18 #include <fcntl.h>
  19
  20 ThreadEngine::ThreadEngine()
  21 {
  22 }
  23
  24 static void* entry_point(void* parameter)
  25 {
  26         /* Recommended by nenolod, signal safety on a per-thread basis */
  27         sigset_t set;
  28         sigemptyset(&set);
  29         sigaddset(&set, SIGPIPE);
  30         pthread_sigmask(SIG_BLOCK, &set, NULL);
  31
  32         Thread* pt = static_cast<Thread*>(parameter);
  33         pt->Run();
  34         return parameter;
  35 }
  36
  37
  38 void ThreadEngine::Start(Thread* thread)
  39 {
  40         ThreadData* data = new ThreadData;
  41         thread->state = data;
  42
  43         if (pthread_create(&data->pthread_id, NULL, entry_point, thread) != 0)
  44         {
  45                 thread->state = NULL;
  46                 delete data;
  47                 throw CoreException("Unable to create new thread: " + std::string(strerror(errno)));
  48         }
  49 }
  50
  51 ThreadEngine::~ThreadEngine()
  52 {
  53 }
  54
  55 void ThreadData::FreeThread(Thread* thread)
  56 {
  57         thread->SetExitFlag();
  58         pthread_join(pthread_id, NULL);
  59 }
  60
  61 #ifdef HAS_EVENTFD
  62 #include <sys/eventfd.h>
  63
  64 class ThreadSignalSocket : public BufferedSocket
  65 {
  66         SocketThread* parent;
  67  public:
  68         ThreadSignalSocket(SocketThread* p, int newfd) : BufferedSocket(newfd), parent(p) {}
  69
  70         ~ThreadSignalSocket()
  71         {
  72         }
  73
  74         void Notify()
  75         {
  76                 eventfd_write(fd, 1);
  77         }
  78
  79         void OnDataReady()
  80         {
  81                 recvq.clear();
  82                 parent->OnNotify();
  83         }
  84
  85         void OnError(BufferedSocketError)
  86         {
  87                 ServerInstance->GlobalCulls.AddItem(this);
  88         }
  89 };
  90
  91 SocketThread::SocketThread()
  92 {
  93         int fd = eventfd(0, O_NONBLOCK);
  94         if (fd < 0)
  95                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
  96         signal.sock = new ThreadSignalSocket(this, fd);
  97 }
  98 #else
  99
 100 class ThreadSignalSocket : public BufferedSocket
 101 {
 102         SocketThread* parent;
 103         int send_fd;
 104  public:
 105         ThreadSignalSocket(SocketThread* p, int recvfd, int sendfd) :
 106                 BufferedSocket(recvfd), parent(p), send_fd(sendfd)  {}
 107
 108         ~ThreadSignalSocket()
 109         {
 110                 close(send_fd);
 111         }
 112
 113         void Notify()
 114         {
 115                 char dummy = '*';
 116                 write(send_fd, &dummy, 1);
 117         }
 118
 119         void OnDataReady()
 120         {
 121                 recvq.clear();
 122                 parent->OnNotify();
 123         }
 124
 125         void OnError(BufferedSocketError)
 126         {
 127                 ServerInstance->GlobalCulls.AddItem(this);
 128         }
 129 };
 130
 131 SocketThread::SocketThread()
 132 {
 133         int fds[2];
 134         if (pipe(fds))
 135                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
 136         signal.sock = new ThreadSignalSocket(this, fds[0], fds[1]);
 137 }
 138 #endif
 139
 140 void SocketThread::NotifyParent()
 141 {
 142         signal.sock->Notify();
 143 }
 144
 145 SocketThread::~SocketThread()
 146 {
 147 }