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                 ServerInstance->SE->AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
  79         }
  80
  81         ~ThreadSignalSocket()
  82         {
  83         }
  84
  85         void Notify()
  86         {
  87                 eventfd_write(fd, 1);
  88         }
  89
  90         void HandleEvent(EventType et, int errornum)
  91         {
  92                 if (et == EVENT_READ)
  93                 {
  94                         eventfd_t dummy;
  95                         eventfd_read(fd, &dummy);
  96                         parent->OnNotify();
  97                 }
  98                 else
  99                 {
 100                         ServerInstance->GlobalCulls.AddItem(this);
 101                 }
 102         }
 103 };
 104
 105 SocketThread::SocketThread()
 106 {
 107         int fd = eventfd(0, EFD_NONBLOCK);
 108         if (fd < 0)
 109                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
 110         signal.sock = new ThreadSignalSocket(this, fd);
 111 }
 112 #else
 113
 114 class ThreadSignalSocket : public EventHandler
 115 {
 116         SocketThread* parent;
 117         int send_fd;
 118  public:
 119         ThreadSignalSocket(SocketThread* p, int recvfd, int sendfd) :
 120                 parent(p), send_fd(sendfd)
 121         {
 122                 SetFd(recvfd);
 123                 ServerInstance->SE->NonBlocking(fd);
 124                 ServerInstance->SE->AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
 125         }
 126
 127         ~ThreadSignalSocket()
 128         {
 129                 close(send_fd);
 130         }
 131
 132         void Notify()
 133         {
 134                 static const char dummy = '*';
 135                 write(send_fd, &dummy, 1);
 136         }
 137
 138         void HandleEvent(EventType et, int errornum)
 139         {
 140                 if (et == EVENT_READ)
 141                 {
 142                         char dummy[128];
 143                         read(fd, dummy, 128);
 144                         parent->OnNotify();
 145                 }
 146                 else
 147                 {
 148                         ServerInstance->GlobalCulls.AddItem(this);
 149                 }
 150         }
 151 };
 152
 153 SocketThread::SocketThread()
 154 {
 155         int fds[2];
 156         if (pipe(fds))
 157                 throw new CoreException("Could not create pipe " + std::string(strerror(errno)));
 158         signal.sock = new ThreadSignalSocket(this, fds[0], fds[1]);
 159 }
 160 #endif
 161
 162 void SocketThread::NotifyParent()
 163 {
 164         signal.sock->Notify();
 165 }
 166
 167 SocketThread::~SocketThread()
 168 {
 169 }