src/unix/timerunx.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/unix/timerunx.cpp
   3 // Purpose:     wxTimer implementation for non-GUI applications under Unix
   4 // Author:      Lukasz Michalski
   5 // Created:     15/01/2005
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 Lukasz Michalski
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 #include "wx/wxprec.h"
  20
  21 #if wxUSE_TIMER
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/log.h"
  25     #include "wx/module.h"
  26     #include "wx/app.h"
  27     #include "wx/list.h"
  28     #include "wx/hashmap.h"
  29     #include "wx/event.h"
  30 #endif
  31
  32 #include "wx/apptrait.h"
  33 #include "wx/longlong.h"
  34
  35 #include <sys/time.h>
  36 #include <signal.h>
  37
  38 #include "wx/unix/private/timer.h"
  39
  40 #include "wx/listimpl.cpp"
  41 WX_DEFINE_LIST(wxTimerList)
  42
  43 // trace mask for the debugging messages used here
  44 #define wxTrace_Timer wxT("timer")
  45
  46 // ----------------------------------------------------------------------------
  47 // local functions
  48 // ----------------------------------------------------------------------------
  49
  50 // helper function to format wxUsecClock_t
  51 static inline wxString wxUsecClockAsString(wxUsecClock_t usec)
  52 {
  53     #if wxUSE_LONGLONG
  54         return usec.ToString();
  55     #else // wxUsecClock_t == double
  56         return wxString::Format(_T("%.0f"), usec);
  57     #endif
  58 }
  59
  60 // ============================================================================
  61 // wxTimerScheduler implementation
  62 // ============================================================================
  63
  64 wxTimerScheduler *wxTimerScheduler::ms_instance = NULL;
  65
  66 wxTimerScheduler::~wxTimerScheduler()
  67 {
  68     for ( wxTimerList::iterator node = m_timers.begin();
  69           node != m_timers.end();
  70           ++node )
  71     {
  72         delete *node;
  73     }
  74 }
  75
  76 void wxTimerScheduler::AddTimer(wxUnixTimerImpl *timer, wxUsecClock_t expiration)
  77 {
  78     DoAddTimer(new wxTimerSchedule(timer, expiration));
  79 }
  80
  81 void wxTimerScheduler::DoAddTimer(wxTimerSchedule *s)
  82 {
  83     // do an insertion sort to keep the list sorted in expiration order
  84     wxTimerList::iterator node;
  85     for ( node = m_timers.begin(); node != m_timers.end(); ++node )
  86     {
  87         wxASSERT_MSG( (*node)->m_timer != s->m_timer,
  88                       _T("adding the same timer twice?") );
  89
  90         if ( (*node)->m_expiration > s->m_expiration )
  91             break;
  92     }
  93
  94     m_timers.insert(node, s);
  95
  96     wxLogTrace(wxTrace_Timer, wxT("Inserted timer %d expiring at %s"),
  97                s->m_timer->GetId(),
  98                wxUsecClockAsString(s->m_expiration).c_str());
  99 }
 100
 101 void wxTimerScheduler::RemoveTimer(wxUnixTimerImpl *timer)
 102 {
 103     wxLogTrace(wxTrace_Timer, wxT("Removing timer %d"), timer->GetId());
 104
 105     for ( wxTimerList::iterator node = m_timers.begin();
 106           node != m_timers.end();
 107           ++node )
 108     {
 109         if ( (*node)->m_timer == timer )
 110         {
 111             delete *node;
 112             m_timers.erase(node);
 113             return;
 114         }
 115     }
 116
 117     wxFAIL_MSG( _T("removing inexistent timer?") );
 118 }
 119
 120 bool wxTimerScheduler::GetNext(wxUsecClock_t *remaining) const
 121 {
 122     if ( m_timers.empty() )
 123       return false;
 124
 125     wxCHECK_MSG( remaining, false, _T("NULL pointer") );
 126
 127     *remaining = (*m_timers.begin())->m_expiration - wxGetLocalTimeUsec();
 128     if ( *remaining < 0 )
 129     {
 130         // timer already expired, don't wait at all before notifying it
 131         *remaining = 0;
 132     }
 133
 134     return true;
 135 }
 136
 137 void wxTimerScheduler::NotifyExpired()
 138 {
 139     if ( m_timers.empty() )
 140       return;
 141
 142     const wxUsecClock_t now = wxGetLocalTimeUsec();
 143
 144     wxTimerList::iterator cur,
 145                           next;
 146     for ( cur = m_timers.begin(); cur != m_timers.end(); cur = next )
 147     {
 148         wxTimerSchedule * const s = *cur;
 149         if ( s->m_expiration > now )
 150         {
 151             // as the list is sorted by expiration time, we can skip the rest
 152             break;
 153         }
 154
 155         // remember next as we will delete the node pointed to by cur
 156         next = cur;
 157         ++next;
 158
 159         m_timers.erase(cur);
 160
 161         // check whether we need to keep this timer
 162         wxUnixTimerImpl * const timer = s->m_timer;
 163         if ( timer->IsOneShot() )
 164         {
 165             // the timer needs to be stopped but don't call its Stop() from
 166             // here as it would attempt to remove the timer from our list and
 167             // we had already done it, so we just need to reset its state
 168             timer->MarkStopped();
 169
 170             // don't need it any more
 171             delete s;
 172         }
 173         else // reschedule the next timer expiration
 174         {
 175             // always keep the expiration time in the future, i.e. base it on
 176             // the current time instead of just offsetting it from the current
 177             // expiration time because it could happen that we're late and the
 178             // current expiration time is (far) in the past
 179             s->m_expiration = now + timer->GetInterval()*1000;
 180             DoAddTimer(s);
 181         }
 182
 183         // and finally notify the timer
 184         timer->Notify();
 185     }
 186 }
 187
 188 // ============================================================================
 189 // wxUnixTimerImpl implementation
 190 // ============================================================================
 191
 192 wxUnixTimerImpl::wxUnixTimerImpl(wxTimer* timer)
 193                : wxTimerImpl(timer)
 194 {
 195     m_isRunning = false;
 196 }
 197
 198 bool wxUnixTimerImpl::Start(int milliseconds, bool oneShot)
 199 {
 200     // notice that this will stop an already running timer
 201     wxTimerImpl::Start(milliseconds, oneShot);
 202
 203     wxTimerScheduler::Get().AddTimer(this, wxGetLocalTimeUsec() + m_milli*1000);
 204     m_isRunning = true;
 205
 206     return true;
 207 }
 208
 209 void wxUnixTimerImpl::Stop()
 210 {
 211     if ( m_isRunning )
 212     {
 213         wxTimerScheduler::Get().RemoveTimer(this);
 214
 215         m_isRunning = false;
 216     }
 217 }
 218
 219 bool wxUnixTimerImpl::IsRunning() const
 220 {
 221     return m_isRunning;
 222 }
 223
 224 wxUnixTimerImpl::~wxUnixTimerImpl()
 225 {
 226     wxASSERT_MSG( !m_isRunning, _T("must have been stopped before") );
 227 }
 228
 229 // ============================================================================
 230 // wxTimerUnixModule: responsible for freeing the global timer scheduler
 231 // ============================================================================
 232
 233 class wxTimerUnixModule : public wxModule
 234 {
 235 public:
 236     wxTimerUnixModule() {}
 237     virtual bool OnInit() { return true; }
 238     virtual void OnExit() { wxTimerScheduler::Shutdown(); }
 239
 240     DECLARE_DYNAMIC_CLASS(wxTimerUnixModule)
 241 };
 242
 243 IMPLEMENT_DYNAMIC_CLASS(wxTimerUnixModule, wxModule)
 244
 245 // ============================================================================
 246 // global functions
 247 // ============================================================================
 248
 249 wxUsecClock_t wxGetLocalTimeUsec()
 250 {
 251 #ifdef HAVE_GETTIMEOFDAY
 252     struct timeval tv;
 253     if ( wxGetTimeOfDay(&tv) != -1 )
 254     {
 255         wxUsecClock_t val = 1000000L; // usec/sec
 256         val *= tv.tv_sec;
 257         return val + tv.tv_usec;
 258     }
 259 #endif // HAVE_GETTIMEOFDAY
 260
 261     return wxGetLocalTimeMillis() * 1000L;
 262 }
 263
 264 wxTimerImpl *wxConsoleAppTraits::CreateTimerImpl(wxTimer *timer)
 265 {
 266     return new wxUnixTimerImpl(timer);
 267 }
 268
 269 #endif // wxUSE_TIMER
 270