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/* |
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iom.h -- I/O multiplexor |
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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 VPE_IOM_H__ |
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#define VPE_IOM_H__ |
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|
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#include <vector> |
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|
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#include <sys/poll.h> |
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|
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#include "slog.h" |
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|
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typedef double tstamp; |
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|
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extern tstamp NOW; |
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|
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template<class R, class A> class callback; |
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struct io_watcher; |
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struct time_watcher; |
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|
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class io_manager { |
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vector<pollfd> pfs; |
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vector<const io_watcher *> iow; |
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vector<time_watcher *> tw; // actually a heap |
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|
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void idle_cb (tstamp &ts); time_watcher *idle; |
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public: |
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|
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void reschedule_time_watchers (); |
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|
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// register a watcher |
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void reg (int fd, short events, io_watcher *w); |
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void unreg (io_watcher *w); |
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void reg (time_watcher *w); |
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void unreg (time_watcher *w); |
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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; |
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|
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template<class R, class A> |
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class callback { |
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struct object { }; |
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|
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void *obj; |
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R (object::*meth)(A arg); |
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|
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// a proxy is a kind of recipe on how to call a specific class method |
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struct proxy_base { |
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virtual R call (void *obj, R (object::*meth)(A), A arg) = 0; |
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}; |
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template<class O1, class O2> |
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struct proxy : proxy_base { |
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virtual R call (void *obj, R (object::*meth)(A), A arg) |
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{ |
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((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<R (O2::*)(A)>(meth))) |
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(arg); |
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} |
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}; |
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|
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proxy_base *prxy; |
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|
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public: |
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template<class O1, class O2> |
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callback (O1 *object, R (O2::*method)(A)) |
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{ |
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static proxy<O1,O2> p; |
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obj = reinterpret_cast<void *>(object); |
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meth = reinterpret_cast<R (object::*)(A)>(method); |
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prxy = &p; |
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} |
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|
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R call(A arg) const |
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{ |
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return prxy->call (obj, meth, arg); |
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} |
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|
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R operator ()(A arg) const |
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{ |
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return call (arg); |
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} |
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}; |
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|
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struct io_watcher : callback<void, short> { |
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template<class O1, class O2> |
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io_watcher (O1 *object, void (O2::*method)(short revents)) |
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: callback<void, short>(object,method) |
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{ } |
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|
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~io_watcher () |
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{ |
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iom.unreg (this); |
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} |
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|
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void start (int fd, short events) |
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{ |
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iom.reg (fd, events, this); |
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} |
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|
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void stop () |
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{ |
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iom.unreg (this); |
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} |
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}; |
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|
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#define TSTAMP_CANCEL -1. |
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|
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struct time_watcher : callback<void, tstamp &> { |
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bool registered; // already registered? |
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tstamp at; |
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|
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template<class O1, class O2> |
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time_watcher (O1 *object, void (O2::*method)(tstamp &)) |
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: callback<void, tstamp &>(object,method) |
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, registered(false) |
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{ } |
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|
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~time_watcher () |
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{ |
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iom.unreg (this); |
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} |
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|
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void set (tstamp when); |
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void trigger (); |
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|
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void operator ()() |
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{ |
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trigger (); |
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} |
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|
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void start (); |
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void start (tstamp when) |
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{ |
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set (when); |
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} |
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|
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void stop () |
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{ |
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iom.unreg (this); |
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} |
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|
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void reset (tstamp when = TSTAMP_CANCEL) |
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{ |
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stop (); |
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at = when; |
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} |
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}; |
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|
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#endif |
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|
