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Simplifies and fix bugs in FbTk::Timer

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* Calling Timer::setTimeout() from within Timer::start() might lead to ugly
  behavior (as experienced in bugs #3590078, #3600143, etc; see commit
  4d307dcd10, fixes the problem partially).

* Stop a timer first, then call the handler (via Timer::fireTimeout()). A
  given handler might call Timer::start() again, which (re)adds the Timer
  to the control list .. the following Timer::stop() would remove it again.

* Use 'm_start' as indicator if timer is running.

* Move the (now quite short) code of ::addTimer / ::removeTimer
  into the Timer::start() and Timer::stop() functions.
This commit is contained in:
Mathias Gumz 2013-01-15 21:40:33 +01:00
parent 239e895826
commit 33161595f4
2 changed files with 36 additions and 41 deletions
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72
src/FbTk/Timer.cc
View file

@ -55,7 +55,6 @@
#include <vector>
#include <set>
namespace {
struct TimerCompare {
@ -64,51 +63,30 @@ struct TimerCompare {
}
};
typedef std::set<FbTk::Timer*, TimerCompare> TimerList;
TimerList s_timerlist;
/// add a timer to the static list
void addTimer(FbTk::Timer *timer) {
assert(timer);
int interval = timer->getInterval();
// interval timers have their timeout change every time they are started!
if (interval != 0) {
timer->setTimeout(interval * FbTk::FbTime::IN_SECONDS);
}
s_timerlist.insert(timer);
}
/// remove a timer from the static list
void removeTimer(FbTk::Timer *timer) {
assert(timer);
s_timerlist.erase(timer);
}
}
namespace FbTk {
Timer::Timer():m_timing(false), m_once(false), m_interval(0) {
Timer::Timer() :
m_once(false),
m_interval(0),
m_start(0) {
}
Timer::Timer(const RefCount<Slot<void> > &handler):
m_handler(handler),
m_timing(false),
m_once(false),
m_interval(0) {
m_interval(0),
m_start(0) {
}
Timer::~Timer() {
if (isTiming()) stop();
stop();
}
@ -131,19 +109,31 @@ void Timer::setCommand(const RefCount<Slot<void> > &cmd) {
void Timer::start() {
m_start = FbTk::FbTime::now();
// only add Timers that actually DO something
if ((! m_timing || m_interval != 0) && m_handler) {
m_timing = true;
::addTimer(this);
if ( ( ! isTiming() || m_interval > 0 ) && m_handler) {
// in case start() gets triggered on a started
// timer with 'm_interval != 0' we have to remove
// it from s_timerlist before restarting it
stop();
m_start = FbTk::FbTime::now();
// interval timers have their timeout change every
// time they are started!
if (m_interval != 0) {
m_timeout = m_interval * FbTk::FbTime::IN_SECONDS;
}
s_timerlist.insert(this);
}
}
void Timer::stop() {
m_timing = false;
::removeTimer(this);
if (isTiming()) {
s_timerlist.erase(this);
m_start = 0;
}
}
uint64_t Timer::getEndTime() const {
@ -216,10 +206,16 @@ void Timer::updateTimers(int fd) {
FbTk::Timer& t = *timeouts[i];
t.fireTimeout();
// first we stop the timer to remove it
// from s_timerlist
t.stop();
if (! t.doOnce()) { // restart the current timer
// then we call the handler which might (re)start 't'
// on it's own
t.fireTimeout();
// restart 't' if needed
if (!t.doOnce() && !t.isTiming()) {
t.start();
}
}

5
src/FbTk/Timer.hh
View file

@ -61,7 +61,7 @@ public:
static void updateTimers(int file_descriptor);
int isTiming() const { return m_timing; }
int isTiming() const { return (m_start > 0); }
int getInterval() const { return m_interval; }
int doOnce() const { return m_once; }
@ -77,11 +77,10 @@ protected:
private:
RefCount<Slot<void> > m_handler; ///< what to do on a timeout
bool m_timing; ///< clock running?
bool m_once; ///< do timeout only once?
int m_interval; ///< Is an interval-only timer (e.g. clock), in seconds
uint64_t m_start; ///< start time in microseconds
uint64_t m_start; ///< start time in microseconds, 0 if not running
uint64_t m_timeout; ///< time length in microseconds
};