src/threadengines/threadengine_pthread.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
   6  *
   7  * This file is part of InspIRCd.  InspIRCd is free software: you can
   8  * redistribute it and/or modify it under the terms of the GNU General Public
   9  * License as published by the Free Software Foundation, version 2.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14  * details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include "inspircd.h"
  22 #include "threadengines/threadengine_pthread.h"
  23 #include <pthread.h>
  24 #include <fcntl.h>
  25
  26 static void* entry_point(void* parameter)
  27 {
  28         /* Recommended by nenolod, signal safety on a per-thread basis */
  29         sigset_t set;
  30         sigemptyset(&set);
  31         sigaddset(&set, SIGPIPE);
  32         pthread_sigmask(SIG_BLOCK, &set, NULL);
  33
  34         Thread* pt = static_cast<Thread*>(parameter);
  35         pt->Run();
  36         return parameter;
  37 }
  38
  39
  40 void ThreadEngine::Start(Thread* thread)
  41 {
  42         if (pthread_create(&thread->state.pthread_id, NULL, entry_point, thread) != 0)
  43                 throw CoreException("Unable to create new thread: " + std::string(strerror(errno)));
  44 }
  45
  46 void ThreadEngine::Stop(Thread* thread)
  47 {
  48         thread->SetExitFlag();
  49         pthread_join(thread->state.pthread_id, NULL);
  50 }
  51
  52 #ifdef HAS_EVENTFD
  53 #include <sys/eventfd.h>
  54
  55 class ThreadSignalSocket : public EventHandler
  56 {
  57         SocketThread* parent;
  58  public:
  59         ThreadSignalSocket(SocketThread* p, int newfd) : parent(p)
  60         {
  61                 SetFd(newfd);
  62                 SocketEngine::AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
  63         }
  64
  65         ~ThreadSignalSocket()
  66         {
  67                 SocketEngine::Close(this);
  68         }
  69
  70         void Notify()
  71         {
  72                 eventfd_write(fd, 1);
  73         }
  74
  75         void HandleEvent(EventType et, int errornum)
  76         {
  77                 if (et == EVENT_READ)
  78                 {
  79                         eventfd_t dummy;
  80                         eventfd_read(fd, &dummy);
  81                         parent->OnNotify();
  82                 }
  83                 else
  84                 {
  85                         ServerInstance->GlobalCulls.AddItem(this);
  86                 }
  87         }
  88 };
  89
  90 SocketThread::SocketThread()
  91 {
  92         signal.sock = NULL;
  93         int fd = eventfd(0, EFD_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 EventHandler
 101 {
 102         SocketThread* parent;
 103         int send_fd;
 104  public:
 105         ThreadSignalSocket(SocketThread* p, int recvfd, int sendfd) :
 106                 parent(p), send_fd(sendfd)
 107         {
 108                 SetFd(recvfd);
 109                 SocketEngine::NonBlocking(fd);
 110                 SocketEngine::AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
 111         }
 112
 113         ~ThreadSignalSocket()
 114         {
 115                 close(send_fd);
 116                 SocketEngine::Close(this);
 117         }
 118
 119         void Notify()
 120         {
 121                 static const char dummy = '*';
 122                 write(send_fd, &dummy, 1);
 123         }
 124
 125         void HandleEvent(EventType et, int errornum)
 126         {
 127                 if (et == EVENT_READ)
 128                 {
 129                         char dummy[128];
 130                         read(fd, dummy, 128);
 131                         parent->OnNotify();
 132                 }
 133                 else
 134                 {
 135                         ServerInstance->GlobalCulls.AddItem(this);
 136                 }
 137         }
 138 };
 139
 140 SocketThread::SocketThread()
 141 {
 142         signal.sock = NULL;
 143         int fds[2];
 144         if (pipe(fds))
 145                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
 146         signal.sock = new ThreadSignalSocket(this, fds[0], fds[1]);
 147 }
 148 #endif
 149
 150 void SocketThread::NotifyParent()
 151 {
 152         signal.sock->Notify();
 153 }
 154
 155 SocketThread::~SocketThread()
 156 {
 157         if (signal.sock)
 158         {
 159                 signal.sock->cull();
 160                 delete signal.sock;
 161         }
 162 }