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/* |
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iom.C -- generic I/O multiplexor |
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Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "../config.h" |
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|
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#include <cstdio> |
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|
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#include <sys/select.h> |
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#include <sys/time.h> |
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|
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#include "iom.h" |
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|
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tstamp NOW; |
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bool iom_valid; |
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io_manager iom; |
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|
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template<class watcher> |
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void io_manager::reg (watcher *w, simplevec<watcher *> &queue) |
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{ |
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if (find (queue.begin (), queue.end (), w) == queue.end ()) |
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queue.push_back (w); |
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} |
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|
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template<class watcher> |
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void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) |
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{ |
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queue.erase (find (queue.begin (), queue.end (), w)); |
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} |
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|
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#if IOM_IO |
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io_watcher::~io_watcher () |
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{ |
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if (iom_valid) |
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iom.unreg (this); |
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} |
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|
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void io_manager::reg (io_watcher *w) |
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{ |
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reg (w, iow); |
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} |
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|
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void io_manager::unreg (io_watcher *w) |
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{ |
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unreg (w, iow); |
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} |
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|
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#endif |
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|
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#if IOM_TIME |
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void time_watcher::trigger () |
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{ |
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call (*this); |
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|
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iom.reg (this); |
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} |
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|
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time_watcher::~time_watcher () |
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{ |
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if (iom_valid) |
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iom.unreg (this); |
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|
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at = TSTAMP_CANCEL; |
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} |
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|
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void io_manager::reg (time_watcher *w) |
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{ |
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reg (w, tw); |
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} |
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|
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void io_manager::unreg (time_watcher *w) |
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{ |
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unreg (w, tw); |
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} |
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#endif |
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|
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#if IOM_CHECK |
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check_watcher::~check_watcher () |
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{ |
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if (iom_valid) |
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iom.unreg (this); |
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} |
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|
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void io_manager::reg (check_watcher *w) |
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{ |
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reg (w, cw); |
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} |
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|
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void io_manager::unreg (check_watcher *w) |
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{ |
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unreg (w, cw); |
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} |
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#endif |
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|
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#if IOM_IDLE |
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idle_watcher::~idle_watcher () |
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{ |
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if (iom_valid) |
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iom.unreg (this); |
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} |
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|
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void io_manager::reg (idle_watcher *w) |
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{ |
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reg (w, iw); |
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} |
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|
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void io_manager::unreg (idle_watcher *w) |
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{ |
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unreg (w, iw); |
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} |
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#endif |
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|
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#if IOM_TIME |
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inline void set_now (void) |
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{ |
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struct timeval tv; |
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|
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gettimeofday (&tv, 0); |
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|
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NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; |
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#endif |
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} |
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|
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void io_manager::loop () |
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{ |
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#if IOM_TIME |
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set_now (); |
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#endif |
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|
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for (;;) |
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{ |
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struct timeval *to = 0; |
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struct timeval tval; |
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|
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#if IOM_IDLE |
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if (iw.size ()) |
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{ |
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tval.tv_sec = 0; |
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tval.tv_usec = 0; |
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to = &tval; |
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} |
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else |
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#endif |
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{ |
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#if IOM_TIME |
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time_watcher *w; |
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|
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for (;tw.size ();) |
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{ |
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w = tw[0]; |
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|
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for (time_watcher **i = tw.begin (); i < tw.end (); ++i) |
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if ((*i)->at < w->at) |
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w = *i; |
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|
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if (w->at > NOW) |
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{ |
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double diff = w->at - NOW; |
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tval.tv_sec = (int)diff; |
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tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); |
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to = &tval; |
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break; |
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} |
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else if (w->at >= 0) |
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w->call (*w); |
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else |
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unreg (w); |
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} |
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#endif |
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} |
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|
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#if IOM_CHECK |
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for (int i = 0; i < cw.size (); ++i) |
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cw[i]->call (*cw[i]); |
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#endif |
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|
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#if IOM_IO |
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fd_set rfd, wfd; |
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|
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FD_ZERO (&rfd); |
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FD_ZERO (&wfd); |
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|
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int fds = 0; |
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|
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for (io_watcher **w = iow.begin (); w < iow.end (); ++w) |
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{ |
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if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); |
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if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); |
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|
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if ((*w)->fd >= fds) fds = (*w)->fd + 1; |
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} |
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|
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if (!to && !fds) |
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break; // no events |
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|
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fds = select (fds, &rfd, &wfd, 0, to); |
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# if IOM_TIME |
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set_now (); |
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# endif |
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|
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if (fds > 0) |
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for (int i = 0; i < iow.size (); ++i) |
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{ |
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io_watcher *w = iow[i]; |
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|
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short revents = w->events; |
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|
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if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; |
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if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; |
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|
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if (revents) |
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w->call (*w, revents); |
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} |
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#if IOM_IDLE |
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else if (iw.size ()) |
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for (int i = 0; i < iw.size (); ++i) |
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iw[i]->call (*iw[i]); |
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#endif |
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|
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#elif IOM_TIME |
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if (!to) |
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break; |
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|
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select (0, 0, 0, 0, &to); |
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set_now (); |
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#else |
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break; |
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#endif |
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} |
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} |
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|
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io_manager::io_manager () |
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{ |
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#if IOM_TIME |
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set_now (); |
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#endif |
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|
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iom_valid = true; |
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} |
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|
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io_manager::~io_manager () |
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{ |
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iom_valid = false; |
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} |
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|
