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mirror of git://projects.qi-hardware.com/gmenu2x.git synced 2024-11-25 18:05:20 +02:00

Made Clock simpler and more reliable

Removed the suspend check: the best thing we can do after oversleeping
is the same as when we're woken right on time: fetch the time and
reschedule for the next minute boundary.

Don't create a new timer on every callback; instead return the next
interval to SDL.
This commit is contained in:
Maarten ter Huurne 2013-08-07 02:57:44 +02:00
parent a15339d425
commit 9158b90a45
2 changed files with 20 additions and 35 deletions

View File

@ -23,31 +23,23 @@ static void notify()
extern "C" Uint32 clockCallbackFunc(Uint32 timeout, void *d);
class Clock::Forwarder {
static unsigned int clockCallbackFunc(Clock *clock, unsigned int timeout)
static unsigned int clockCallbackFunc(Clock *clock)
{
return clock->clockCallback(timeout);
return clock->clockCallback();
}
friend Uint32 clockCallbackFunc(Uint32 timeout, void *d);
};
extern "C" Uint32 clockCallbackFunc(Uint32 timeout, void *d)
{
return Clock::Forwarder::clockCallbackFunc(static_cast<Clock *>(d), timeout);
return Clock::Forwarder::clockCallbackFunc(static_cast<Clock *>(d));
}
unsigned int Clock::clockCallback(unsigned int timeout)
unsigned int Clock::clockCallback()
{
unsigned int now_ticks = SDL_GetTicks();
if (now_ticks > timeout_startms + timeout + 1000) {
DEBUG("Suspend occured, restarting timer\n");
timeout_startms = now_ticks;
return timeout;
}
resetTimer();
unsigned int ms = update();
notify();
return 60000;
return ms;
}
std::string Clock::getTime(bool is24)
@ -63,7 +55,7 @@ std::string Clock::getTime(bool is24)
return std::string(buf);
}
int Clock::update()
unsigned int Clock::update()
{
struct timeval tv;
struct tm result;
@ -71,25 +63,20 @@ int Clock::update()
localtime_r(&tv.tv_sec, &result);
minutes = result.tm_min;
hours = result.tm_hour;
DEBUG("Time updated: %02i:%02i\n", hours, minutes);
return result.tm_sec;
}
DEBUG("Time updated: %02i:%02i:%02i\n", hours, minutes, result.tm_sec);
void Clock::resetTimer()
{
SDL_RemoveTimer(timer);
timer = NULL;
int secs = update();
addTimer((60 - secs) * 1000);
// Compute number of milliseconds to next minute boundary.
// We don't need high precision, but it is important that any deviation is
// past the minute mark, so the fetched hour and minute number belong to
// the freshly started minute.
// Clamping it at 1 sec both avoids overloading the system in case our
// computation goes haywire and avoids passing 0 to SDL, which would stop
// the recurring timer.
return std::max(1, (60 - result.tm_sec)) * 1000;
}
void Clock::addTimer(int timeout)
{
if (timeout < 1000 || timeout > 60000)
timeout = 60000;
timeout_startms = SDL_GetTicks();
timer = SDL_AddTimer(timeout, clockCallbackFunc, this);
if (timer == NULL)
ERROR("Could not initialize SDLTimer: %s\n", SDL_GetError());
@ -99,8 +86,8 @@ Clock::Clock()
{
tzset();
int sec = update();
addTimer((60 - sec) * 1000);
unsigned int ms = update();
addTimer(ms);
}
Clock::~Clock()

View File

@ -16,12 +16,10 @@ public:
private:
void addTimer(int timeout);
void resetTimer();
int update();
unsigned int clockCallback(unsigned int timeout);
unsigned int update();
unsigned int clockCallback();
SDL_TimerID timer;
unsigned int timeout_startms;
int minutes, hours;
};