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// --------------------------------------------------------------------------
//
// File
// Name: Timer.cpp
// Purpose: Generic timers which execute arbitrary code when
// they expire.
// Created: 5/11/2006
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <signal.h>
#include "Timer.h"
#include "MemLeakFindOn.h"
std::vector<Timer*> Timers::sTimers;
bool Timers::sInitialised = false;
// --------------------------------------------------------------------------
//
// Function
// Name: static void TimerSigHandler(int)
// Purpose: Signal handler, notifies Timers class
// Created: 19/3/04
//
// --------------------------------------------------------------------------
static void TimerSigHandler(int iUnused)
{
Timers::Signal();
}
// --------------------------------------------------------------------------
//
// Function
// Name: static void Timers::Init()
// Purpose: Initialise timers, prepare signal handler
// Created: 5/11/2006
//
// --------------------------------------------------------------------------
void Timers::Init()
{
ASSERT(!sInitialised);
#ifdef PLATFORM_CYGWIN
ASSERT(::signal(SIGALRM, TimerSigHandler) == 0);
#elif defined WIN32
// no support for signals at all
InitTimer();
SetTimerHandler(TimerSigHandler);
#else
ASSERT(::signal(SIGALRM, TimerSigHandler) == 0);
#endif // PLATFORM_CYGWIN
sInitialised = true;
}
// --------------------------------------------------------------------------
//
// Function
// Name: static void Timers::Cleanup()
// Purpose: Clean up timers, stop signal handler
// Created: 6/11/2006
//
// --------------------------------------------------------------------------
void Timers::Cleanup()
{
ASSERT(sInitialised);
#ifdef PLATFORM_CYGWIN
ASSERT(::signal(SIGALRM, NULL) == TimerSigHandler);
#elif defined WIN32
// no support for signals at all
SetTimerHandler(NULL);
FiniTimer();
#else
ASSERT(::signal(SIGALRM, NULL) == TimerSigHandler);
#endif // PLATFORM_CYGWIN
sTimers.clear();
sInitialised = false;
}
// --------------------------------------------------------------------------
//
// Function
// Name: static void Timers::Add(Timer&)
// Purpose: Add a new timer to the set, and reschedule next wakeup
// Created: 5/11/2006
//
// --------------------------------------------------------------------------
void Timers::Add(Timer& rTimer)
{
ASSERT(sInitialised);
sTimers.push_back(&rTimer);
Reschedule();
}
// --------------------------------------------------------------------------
//
// Function
// Name: static void Timers::Remove(Timer&)
// Purpose: Removes the timer from the set (preventing it from
// being called) and reschedule next wakeup
// Created: 5/11/2006
//
// --------------------------------------------------------------------------
void Timers::Remove(Timer& rTimer)
{
ASSERT(sInitialised);
bool restart = true;
while (restart)
{
restart = false;
for (std::vector<Timer*>::iterator i = sTimers.begin();
i != sTimers.end(); i++)
{
if (&rTimer == *i)
{
sTimers.erase(i);
restart = true;
break;
}
}
}
Reschedule();
}
// --------------------------------------------------------------------------
//
// Function
// Name: static void Timers::Reschedule()
// Purpose: Recalculate when the next wakeup is due
// Created: 5/11/2006
//
// --------------------------------------------------------------------------
void Timers::Reschedule()
{
ASSERT(sInitialised);
box_time_t timeNow = GetCurrentBoxTime();
box_time_t timeToNextEvent = 0;
for (std::vector<Timer*>::iterator i = sTimers.begin();
i != sTimers.end(); i++)
{
Timer& rTimer = **i;
ASSERT(!rTimer.HasExpired());
box_time_t timeToExpiry = rTimer.GetExpiryTime() - timeNow;
if (timeToNextEvent == 0 || timeToNextEvent > timeToExpiry)
{
timeToNextEvent = timeToExpiry;
}
}
ASSERT(timeToNextEvent >= 0);
struct itimerval timeout;
memset(&timeout, 0, sizeof(timeout));
timeout.it_value.tv_sec = BoxTimeToSeconds(timeToNextEvent);
timeout.it_value.tv_usec = (int)
(BoxTimeToMicroSeconds(timeToNextEvent) % MICRO_SEC_IN_SEC);
#ifdef PLATFORM_CYGWIN
if(::setitimer(ITIMER_REAL, &timeout, NULL) != 0)
#else
if(::setitimer(ITIMER_REAL, &timeout, NULL) != 0)
#endif // PLATFORM_CYGWIN
{
TRACE0("WARNING: couldn't initialise timer\n");
THROW_EXCEPTION(CommonException, Internal)
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: static void Timers::Signal()
// Purpose: Called by signal handler. Signals any timers which
// are due or overdue, removes them from the set,
// and reschedules next wakeup.
// Created: 5/11/2006
//
// --------------------------------------------------------------------------
void Timers::Signal()
{
ASSERT(sInitialised);
box_time_t timeNow = GetCurrentBoxTime();
std::vector<Timer*> timersCopy = sTimers;
for (std::vector<Timer*>::iterator i = timersCopy.begin();
i != timersCopy.end(); i++)
{
Timer& rTimer = **i;
ASSERT(!rTimer.HasExpired());
box_time_t timeToExpiry = rTimer.GetExpiryTime() - timeNow;
if (timeToExpiry <= 0)
{
rTimer.OnExpire();
}
}
Reschedule();
}
Timer::Timer(size_t timeoutSecs)
: mExpires(GetCurrentBoxTime() + SecondsToBoxTime(timeoutSecs)),
mExpired(false)
{
Timers::Add(*this);
}
Timer::~Timer()
{
Timers::Remove(*this);
}
Timer::Timer(const Timer& rToCopy)
: mExpires(rToCopy.mExpires),
mExpired(rToCopy.mExpired)
{
Timers::Add(*this);
}
Timer& Timer::operator=(const Timer& rToCopy)
{
Timers::Remove(*this);
mExpires = rToCopy.mExpires;
mExpired = rToCopy.mExpired;
if (!mExpired)
{
Timers::Add(*this);
}
}
void Timer::OnExpire()
{
mExpired = true;
Timers::Remove(*this);
}
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