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/* |
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iom.h -- generic I/O multiplexor |
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Copyright (C) 2003, 2004 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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#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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|
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typedef double tstamp; |
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extern tstamp NOW; |
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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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|
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template<class watcher> |
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struct io_manager_vec : protected vector<watcher *> { |
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friend class io_manager; |
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protected: |
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void erase_unordered (unsigned int pos) |
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{ |
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watcher *w = (*this)[size () - 1]; |
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pop_back (); |
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|
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if (size ()) |
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if ((*this)[pos] = w) |
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w->active = pos + 1; |
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} |
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}; |
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|
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class io_manager { |
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#if IOM_IO |
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io_manager_vec<io_watcher> iow; |
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#endif |
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#if IOM_CHECK |
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io_manager_vec<check_watcher> cw; |
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#endif |
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#if IOM_TIME |
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io_manager_vec<time_watcher> tw; |
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#endif |
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#if IOM_IDLE |
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io_manager_vec<idle_watcher> iw; |
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#endif |
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|
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template<class watcher> |
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void reg (watcher *w, io_manager_vec<watcher> &queue); |
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|
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template<class watcher> |
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void unreg (watcher *w, io_manager_vec<watcher> &queue); |
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|
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public: |
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// register a watcher |
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#if IOM_IO |
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void reg (io_watcher *w); void unreg (io_watcher *w); |
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#endif |
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#if IOM_TIME |
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void reg (time_watcher *w); void unreg (time_watcher *w); |
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#endif |
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#if IOM_CHECK |
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void reg (check_watcher *w); void unreg (check_watcher *w); |
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#endif |
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#if IOM_IDLE |
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void reg (idle_watcher *w); void unreg (idle_watcher *w); |
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#endif |
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|
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void loop (); |
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|
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io_manager (); |
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~io_manager (); |
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}; |
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|
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extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
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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_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 () { iom.reg (this); } |
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void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
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void stop () { iom.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 () { iom.reg (this); } |
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void start (tstamp when) { set (when); iom.reg (this); } |
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void stop () { iom.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 () { iom.reg (this); } |
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void stop () { iom.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 () { iom.reg (this); } |
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void stop () { iom.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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#endif |
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