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 <signal.h>
  25 #include <fcntl.h>
  26
  27 ThreadEngine::ThreadEngine()
  28 {
  29 }
  30
  31 static void* entry_point(void* parameter)
  32 {
  33         /* Recommended by nenolod, signal safety on a per-thread basis */
  34         sigset_t set;
  35         sigemptyset(&set);
  36         sigaddset(&set, SIGPIPE);
  37         pthread_sigmask(SIG_BLOCK, &set, NULL);
  38
  39         Thread* pt = static_cast<Thread*>(parameter);
  40         pt->Run();
  41         return parameter;
  42 }
  43
  44
  45 void ThreadEngine::Start(Thread* thread)
  46 {
  47         ThreadData* data = new ThreadData;
  48         thread->state = data;
  49
  50         if (pthread_create(&data->pthread_id, NULL, entry_point, thread) != 0)
  51         {
  52                 thread->state = NULL;
  53                 delete data;
  54                 throw CoreException("Unable to create new thread: " + std::string(strerror(errno)));
  55         }
  56 }
  57
  58 ThreadEngine::~ThreadEngine()
  59 {
  60 }
  61
  62 void ThreadData::FreeThread(Thread* thread)
  63 {
  64         thread->SetExitFlag();
  65         pthread_join(pthread_id, NULL);
  66 }
  67
  68 #ifdef HAS_EVENTFD
  69 #include <sys/eventfd.h>
  70
  71 class ThreadSignalSocket : public EventHandler
  72 {
  73         SocketThread* parent;
  74  public:
  75         ThreadSignalSocket(SocketThread* p, int newfd) : parent(p)
  76         {
  77                 SetFd(newfd);
  78                 SocketEngine::AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
  79         }
  80
  81         ~ThreadSignalSocket()
  82         {
  83                 SocketEngine::Close(this);
  84         }
  85
  86         void Notify()
  87         {
  88                 eventfd_write(fd, 1);
  89         }
  90
  91         void HandleEvent(EventType et, int errornum)
  92         {
  93                 if (et == EVENT_READ)
  94                 {
  95                         eventfd_t dummy;
  96                         eventfd_read(fd, &dummy);
  97                         parent->OnNotify();
  98                 }
  99                 else
 100                 {
 101                         ServerInstance->GlobalCulls.AddItem(this);
 102                 }
 103         }
 104 };
 105
 106 SocketThread::SocketThread()
 107 {
 108         signal.sock = NULL;
 109         int fd = eventfd(0, EFD_NONBLOCK);
 110         if (fd < 0)
 111                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
 112         signal.sock = new ThreadSignalSocket(this, fd);
 113 }
 114 #else
 115
 116 class ThreadSignalSocket : public EventHandler
 117 {
 118         SocketThread* parent;
 119         int send_fd;
 120  public:
 121         ThreadSignalSocket(SocketThread* p, int recvfd, int sendfd) :
 122                 parent(p), send_fd(sendfd)
 123         {
 124                 SetFd(recvfd);
 125                 SocketEngine::NonBlocking(fd);
 126                 SocketEngine::AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
 127         }
 128
 129         ~ThreadSignalSocket()
 130         {
 131                 close(send_fd);
 132                 SocketEngine::Close(this);
 133         }
 134
 135         void Notify()
 136         {
 137                 static const char dummy = '*';
 138                 write(send_fd, &dummy, 1);
 139         }
 140
 141         void HandleEvent(EventType et, int errornum)
 142         {
 143                 if (et == EVENT_READ)
 144                 {
 145                         char dummy[128];
 146                         read(fd, dummy, 128);
 147                         parent->OnNotify();
 148                 }
 149                 else
 150                 {
 151                         ServerInstance->GlobalCulls.AddItem(this);
 152                 }
 153         }
 154 };
 155
 156 SocketThread::SocketThread()
 157 {
 158         signal.sock = NULL;
 159         int fds[2];
 160         if (pipe(fds))
 161                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
 162         signal.sock = new ThreadSignalSocket(this, fds[0], fds[1]);
 163 }
 164 #endif
 165
 166 void SocketThread::NotifyParent()
 167 {
 168         signal.sock->Notify();
 169 }
 170
 171 SocketThread::~SocketThread()
 172 {
 173         if (signal.sock)
 174         {
 175                 signal.sock->cull();
 176                 delete signal.sock;
 177         }
 178 }