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/* |
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iom.h -- generic I/O multiplexer |
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Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de> |
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|
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This file is part of GVPE. |
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|
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GVPE 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 gvpe; if not, write to the Free Software |
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Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#ifndef IOM_H__ |
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#define IOM_H__ |
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|
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// required: |
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// - a vector template like simplevec or stl's vector |
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// - defines for all watcher types required in your app |
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// edit iom_conf.h as appropriate. |
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#include "iom_conf.h" |
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|
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#include "callback.h" |
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|
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#ifndef IOM_IO |
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# define IOM_IO 0 |
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#endif |
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#ifndef IOM_TIME |
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# define IOM_TIME 0 |
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#endif |
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#ifndef IOM_CHECK |
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# define IOM_CHECK 0 |
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#endif |
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#ifndef IOM_IDLE |
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# define IOM_IDLE 0 |
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#endif |
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#ifndef IOM_SIG |
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# define IOM_SIG 0 |
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#endif |
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|
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typedef double tstamp; |
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extern tstamp NOW; |
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|
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// TSTAMP_MAX must still fit into a positive struct timeval |
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#define TSTAMP_MAX (double)(1UL<<31) |
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|
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struct watcher; |
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#if IOM_IO |
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struct io_watcher; |
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#endif |
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#if IOM_TIME |
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struct time_watcher; |
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#endif |
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#if IOM_CHECK |
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struct check_watcher; |
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#endif |
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#if IOM_IDLE |
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struct idle_watcher; |
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#endif |
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#if IOM_SIG |
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struct sig_watcher; |
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#endif |
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|
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template<class watcher> |
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struct io_manager_vec : vector<watcher *> { |
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void erase_unordered (unsigned int pos) |
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{ |
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watcher *w = (*this)[this->size () - 1]; |
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this->pop_back (); |
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|
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if (!this->empty ()) |
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if (((*this)[pos] = w)) // '=' is correct! |
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w->active = pos + 1; |
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} |
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}; |
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|
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// only used as a namespace, and for initialisation purposes |
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class io_manager { |
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template<class watcher> |
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static void reg (watcher &w, io_manager_vec<watcher> &queue); |
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|
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template<class watcher> |
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static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
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|
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public: |
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#if IOM_TIME |
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// fetch time only |
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static tstamp now (); |
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|
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// set NOW |
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static void set_now (); |
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#endif |
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|
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// register a watcher |
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#if IOM_IO |
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static void reg (io_watcher &w); static void unreg (io_watcher &w); |
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#endif |
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#if IOM_TIME |
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static void reg (time_watcher &w); static void unreg (time_watcher &w); |
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#endif |
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#if IOM_CHECK |
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static void reg (check_watcher &w); static void unreg (check_watcher &w); |
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#endif |
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#if IOM_IDLE |
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static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
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#endif |
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#if IOM_SIG |
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static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
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#endif |
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|
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static void loop (); |
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}; |
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|
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struct watcher { |
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int active; /* 0 == inactive, else index into respective vector */ |
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|
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watcher () : active (0) { } |
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}; |
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|
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#if IOM_IO |
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enum { EVENT_UNDEF = -1, EVENT_NONE = 0, EVENT_READ = 1, EVENT_WRITE = 2 }; |
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|
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struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
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int fd; |
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short events; |
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|
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void set (int fd_, short events_) { fd = fd_; events = events_; } |
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|
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void set (short events_) { set (fd, events_); } |
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void start () { io_manager::reg (*this); } |
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void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); } |
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void stop () { io_manager::unreg (*this); } |
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|
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template<class O1, class O2> |
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io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
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: callback2<void, io_watcher &, short> (object,method) |
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{ } |
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~io_watcher () { stop (); } |
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}; |
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#endif |
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|
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#if IOM_TIME |
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struct time_watcher : watcher, callback1<void, time_watcher &> { |
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tstamp at; |
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|
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void trigger (); |
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|
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void set (tstamp when) { at = when; } |
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void operator () () { trigger (); } |
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void start () { io_manager::reg (*this); } |
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void start (tstamp when) { set (when); io_manager::reg (*this); } |
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void stop () { io_manager::unreg (*this); } |
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|
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template<class O1, class O2> |
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time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
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: callback1<void, time_watcher &> (object,method), at (0) |
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{ } |
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~time_watcher () { stop (); } |
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}; |
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#endif |
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|
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#if IOM_CHECK |
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// run before checking for new events |
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struct check_watcher : watcher, callback1<void, check_watcher &> { |
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void start () { io_manager::reg (*this); } |
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void stop () { io_manager::unreg (*this); } |
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|
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template<class O1, class O2> |
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check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
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: callback1<void, check_watcher &> (object,method) |
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{ } |
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~check_watcher () { stop (); } |
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}; |
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#endif |
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|
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#if IOM_IDLE |
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// run after checking for any i/o, but before waiting |
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struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
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void start () { io_manager::reg (*this); } |
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void stop () { io_manager::unreg (*this); } |
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|
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template<class O1, class O2> |
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idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
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: callback1<void, idle_watcher &> (object,method) |
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{ } |
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~idle_watcher () { stop (); } |
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}; |
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#endif |
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|
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#if IOM_SIG |
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struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
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int signum; |
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|
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void start (int signum); |
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void stop () { io_manager::unreg (*this); } |
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|
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template<class O1, class O2> |
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sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
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: callback1<void, sig_watcher &> (object,method), signum (-1) |
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{ } |
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~sig_watcher () { stop (); } |
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}; |
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#endif |
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|
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#endif |
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|
