310 lines
6.9 KiB
C++
310 lines
6.9 KiB
C++
// event.cxx -- Flight Gear periodic event scheduler
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//
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// Written by Curtis Olson, started December 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (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, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <simgear/compiler.h>
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#ifdef FG_MATH_EXCEPTION_CLASH
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# include <math.h>
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#endif
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#include STL_ALGORITHM
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#include STL_FUNCTIONAL
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#include STL_STRING
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#ifdef FG_HAVE_STD_INCLUDES
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# include <cstdio>
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# ifdef HAVE_STDLIB_H
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# include <cstdlib>
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# endif
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#else
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# include <stdio.h>
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif
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#if defined( HAVE_WINDOWS_H ) && defined(__MWERKS__)
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# include <windows.h> // For Metrowerks environment
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# include <winbase.h> // There is no ANSI/MSL time function that
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// contains milliseconds
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#endif
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#include <simgear/debug/logstream.hxx>
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#include "event.hxx"
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FG_USING_STD(for_each);
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FG_USING_STD(mem_fun);
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FG_USING_STD(string);
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fgEVENT_MGR global_events;
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fgEVENT::fgEVENT( const string& desc,
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const fgCallback& cb,
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EventState evt_status,
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int evt_interval )
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: description(desc),
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event_cb(cb.clone()),
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status(evt_status),
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interval(evt_interval),
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cum_time(0),
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min_time(100000),
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max_time(0),
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count(0)
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{
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}
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#if 0
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fgEVENT::fgEVENT( const fgEVENT& evt )
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: description(evt.description),
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event_cb(evt.event_cb),
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status(evt.status),
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interval(evt.interval),
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last_run(evt.last_run),
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current(evt.current),
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next_run(evt.next_run),
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cum_time(evt.cum_time),
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min_time(evt.min_time),
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max_time(evt.max_time),
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count(evt.count)
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{
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}
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fgEVENT&
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fgEVENT::operator= ( const fgEVENT& evt )
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{
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if ( this != &evt )
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{
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description = evt.description;
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event_cb = evt.event_cb;
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status = evt.status;
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interval = evt.interval;
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last_run = evt.last_run;
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current = evt.current;
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next_run = evt.next_run;
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cum_time = evt.cum_time;
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min_time = evt.min_time;
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max_time = evt.max_time;
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count = evt.count;
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}
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return *this;
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}
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#endif
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fgEVENT::~fgEVENT()
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{
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delete event_cb;
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}
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void
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fgEVENT::run()
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{
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FG_LOG(FG_EVENT, FG_INFO, "Running " << description );
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// record starting time
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last_run.stamp();
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// run the event
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event_cb->call( (void**)NULL );
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// increment the counter for this event
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count++;
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// update the event status
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status = FG_EVENT_READY;
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// calculate duration and stats
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current.stamp();
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long duration = current - last_run;
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cum_time += duration;
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if ( duration < min_time ) {
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min_time = duration;
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}
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if ( duration > max_time ) {
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max_time = duration;
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}
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// determine the next absolute run time
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next_run = last_run + interval;
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}
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// Dump scheduling stats
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int
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fgEVENT::PrintStats() const
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{
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FG_LOG( FG_EVENT, FG_INFO,
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" " << description
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<< " int=" << interval / 1000.0
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<< " cum=" << cum_time
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<< " min=" << min_time
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<< " max=" << max_time
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<< " count=" << count
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<< " ave=" << cum_time / (double)count );
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return 0;
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}
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// Constructor
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fgEVENT_MGR::fgEVENT_MGR( void ) {
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}
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// Initialize the scheduling subsystem
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void fgEVENT_MGR::Init( void ) {
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FG_LOG(FG_EVENT, FG_INFO, "Initializing event manager" );
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run_queue.erase( run_queue.begin(), run_queue.end() );
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event_table.erase( event_table.begin(), event_table.end() );
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}
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// Register an event with the scheduler.
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void
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fgEVENT_MGR::Register( const string& desc,
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const fgCallback& cb,
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fgEVENT::EventState status,
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int interval )
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{
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// convert interval specified in milleseconds to usec
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fgEVENT* e = new fgEVENT( desc, cb, status, interval * 1000 );
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FG_LOG( FG_EVENT, FG_INFO, "Registering event: " << desc );
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// Actually run the event
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e->run();
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// Now add to event_table
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event_table.push_back(e);
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}
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// Update the scheduling parameters for an event
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void fgEVENT_MGR::Update( void ) {
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}
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// Delete a scheduled event
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void fgEVENT_MGR::Delete( void ) {
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}
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// Temporarily suspend scheduling of an event
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void fgEVENT_MGR::Suspend( void ) {
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}
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// Resume scheduling and event
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void fgEVENT_MGR::Resume( void ) {
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}
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// Dump scheduling stats
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void
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fgEVENT_MGR::PrintStats()
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{
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FG_LOG( FG_EVENT, FG_INFO, "" );
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FG_LOG( FG_EVENT, FG_INFO, "Event Stats" );
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FG_LOG( FG_EVENT, FG_INFO, "-----------" );
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ConstEventIterator first = event_table.begin();
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ConstEventIterator last = event_table.end();
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while ( first != last )
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{
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(*first)->PrintStats();
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++first;
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}
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#if 0 // msvc++ 6.0 barfs at mem_fun()
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for_each( event_table.begin(),
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event_table.end(),
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mem_fun( &fgEVENT::PrintStats ) );
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#endif
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FG_LOG( FG_EVENT, FG_INFO, "");
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}
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// Add pending jobs to the run queue and run the job at the front of
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// the queue
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void fgEVENT_MGR::Process( void ) {
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fgEVENT *e_ptr;
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FGTimeStamp cur_time;
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unsigned int i, size;
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FG_LOG( FG_EVENT, FG_DEBUG, "Processing events" );
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// get the current time
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cur_time.stamp();
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FG_LOG( FG_EVENT, FG_DEBUG,
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" Current timestamp = " << cur_time.get_seconds() );
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// printf("Checking if anything is ready to move to the run queue\n");
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// see if anything else is ready to be placed on the run queue
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size = event_table.size();
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// while ( current != last ) {
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for ( i = 0; i < size; i++ ) {
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// e = *current++;
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e_ptr = event_table[i];
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if ( e_ptr->status == fgEVENT::FG_EVENT_READY ) {
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FG_LOG( FG_EVENT, FG_DEBUG,
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" Item " << i << " current " << cur_time.get_seconds()
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<< " next run @ " << e_ptr->next_run.get_seconds() );
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if ( ( e_ptr->next_run - cur_time ) <= 0 ) {
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run_queue.push_back(e_ptr);
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e_ptr->status = fgEVENT::FG_EVENT_QUEUED;
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}
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}
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}
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// Checking to see if there is anything on the run queue
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// printf("Checking to see if there is anything on the run queue\n");
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if ( run_queue.size() ) {
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// printf("Yep, running it\n");
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e_ptr = run_queue.front();
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run_queue.pop_front();
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e_ptr->run();
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}
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}
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// Destructor
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fgEVENT_MGR::~fgEVENT_MGR( void ) {
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EventIterator first = event_table.begin();
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EventIterator last = event_table.end();
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for ( ; first != last; ++first )
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{
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delete (*first);
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}
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run_queue.erase( run_queue.begin(), run_queue.end() );
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event_table.erase( event_table.begin(), event_table.end() );
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}
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