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timer.cpp
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C/C++ Source or Header
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2002-11-09
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/////////////////////////////////////////////////////////////////////////////
// Name: mgl/timer.cpp
// Purpose: wxTimer implementation
// Author: Vaclav Slavik
// Id: $Id: timer.cpp,v 1.3.2.1 2002/11/09 15:20:36 RR Exp $
// Copyright: (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com)
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "timer.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
// ----------------------------------------------------------------------------
// NB: when using generic wxTimer implementation in your port, you *must* call
// wxTimer::NotifyTimers() often enough. The ideal place for this
// is in wxEventLoop::Dispatch().
// ----------------------------------------------------------------------------
#include "wx/timer.h"
#if wxUSE_TIMER
#include "wx/log.h"
#include "wx/module.h"
// ----------------------------------------------------------------------------
// Time input function
// ----------------------------------------------------------------------------
#ifdef __WXMGL__
// We take advantage of wxMGL's _EVT_getTicks because it is faster
// (especially under MS-DOS!) and more precise than wxGetLocalTimeMillis
// if we are unlucky and the latter combines information from two sources.
#include "wx/mgl/private.h"
extern "C" ulong _EVT_getTicks();
#define GetMillisecondsTime() _EVT_getTicks()
#else
// #define GetMillisecondsTime() wxGetLocalTimeMillis().ToLong()
// Suppresses the debug warning in ToLong. FIXME: check
// that we don't drastically lose precision
#define GetMillisecondsTime() (unsigned long) wxGetLocalTimeMillis().GetValue()
#endif
// ----------------------------------------------------------------------------
// helper structures and wxTimerScheduler
// ----------------------------------------------------------------------------
class wxTimerDesc
{
public:
wxTimerDesc(wxTimer *t) :
timer(t), running(FALSE), next(NULL), prev(NULL),
shotTime(0), deleteFlag(NULL) {}
wxTimer *timer;
bool running;
wxTimerDesc *next, *prev;
unsigned long shotTime;
volatile bool *deleteFlag; // see comment in ~wxTimer
};
class wxTimerScheduler
{
public:
wxTimerScheduler() : m_timers(NULL) {}
void QueueTimer(wxTimerDesc *desc, unsigned long when = 0);
void RemoveTimer(wxTimerDesc *desc);
void NotifyTimers();
private:
wxTimerDesc *m_timers;
};
void wxTimerScheduler::QueueTimer(wxTimerDesc *desc, unsigned long when)
{
if ( desc->running )
return; // already scheduled
if ( when == 0 )
when = GetMillisecondsTime() + desc->timer->GetInterval();
desc->shotTime = when;
desc->running = TRUE;
wxLogTrace( wxT("timer"), wxT("queued timer %p at tick %ld"),
desc->timer, (long) when);
if ( m_timers )
{
wxTimerDesc *d = m_timers;
while ( d->next && d->next->shotTime < when ) d = d->next;
desc->next = d->next;
desc->prev = d;
if ( d->next )
d->next->prev = desc;
d->next = desc;
}
else
{
m_timers = desc;
desc->prev = desc->next = NULL;
}
}
void wxTimerScheduler::RemoveTimer(wxTimerDesc *desc)
{
desc->running = FALSE;
if ( desc == m_timers )
m_timers = desc->next;
if ( desc->prev )
desc->prev->next = desc->next;
if ( desc->next )
desc->next->prev = desc->prev;
desc->prev = desc->next = NULL;
}
void wxTimerScheduler::NotifyTimers()
{
if ( m_timers )
{
bool oneShot;
volatile bool timerDeleted;
unsigned long now = GetMillisecondsTime();
wxTimerDesc *desc;
while ( m_timers && m_timers->shotTime <= now )
{
desc = m_timers;
oneShot = desc->timer->IsOneShot();
RemoveTimer(desc);
timerDeleted = FALSE;
desc->deleteFlag = &timerDeleted;
desc->timer->Notify();
if ( !timerDeleted )
{
wxLogTrace( wxT("timer"), wxT("notified timer %p sheduled for %ld"),
desc->timer, (long) desc->shotTime);
desc->deleteFlag = NULL;
if ( !oneShot )
QueueTimer(desc, now + desc->timer->GetInterval());
}
}
}
}
// ----------------------------------------------------------------------------
// wxTimer
// ----------------------------------------------------------------------------
IMPLEMENT_ABSTRACT_CLASS(wxTimer,wxObject)
wxTimerScheduler *gs_scheduler = NULL;
void wxTimer::Init()
{
if ( !gs_scheduler )
gs_scheduler = new wxTimerScheduler;
m_desc = new wxTimerDesc(this);
}
wxTimer::~wxTimer()
{
wxLogTrace( wxT("timer"), wxT("destroying timer %p..."), this);
if ( IsRunning() )
Stop();
// NB: this is a hack: wxTimerScheduler must have some way of knowing
// that wxTimer object was deleted under its hands -- this may
// happen if somebody is really nasty and deletes the timer
// from wxTimer::Notify()
if ( m_desc->deleteFlag != NULL )
*m_desc->deleteFlag = TRUE;
delete m_desc;
wxLogTrace( wxT("timer"), wxT(" ...done destroying timer %p..."), this);
}
bool wxTimer::IsRunning() const
{
return m_desc->running;
}
bool wxTimer::Start(int millisecs, bool oneShot)
{
wxLogTrace( wxT("timer"), wxT("started timer %p: %i ms, oneshot=%i"),
this, millisecs, oneShot);
if ( !wxTimerBase::Start(millisecs, oneShot) )
return FALSE;
gs_scheduler->QueueTimer(m_desc);
return TRUE;
}
void wxTimer::Stop()
{
if ( !m_desc->running ) return;
gs_scheduler->RemoveTimer(m_desc);
}
/*static*/ void wxTimer::NotifyTimers()
{
if ( gs_scheduler )
gs_scheduler->NotifyTimers();
}
// A module to deallocate memory properly:
class wxTimerModule: public wxModule
{
DECLARE_DYNAMIC_CLASS(wxTimerModule)
public:
wxTimerModule() {}
bool OnInit() { return TRUE; }
void OnExit() { delete gs_scheduler; gs_scheduler = NULL; }
};
IMPLEMENT_DYNAMIC_CLASS(wxTimerModule, wxModule)
#endif //wxUSE_TIMER