unsigned long long
TimerManager::now()
{
if (ms_clockDg)
return ms_clockDg();
#ifdef WINDOWS
LARGE_INTEGER count;
if (!QueryPerformanceCounter(&count))
MORDOR_THROW_EXCEPTION_FROM_LAST_ERROR_API("QueryPerformanceCounter");
unsigned long long countUll = (unsigned long long)count.QuadPart;
if (g_frequency == 0)
g_frequency = queryFrequency();
return muldiv64(countUll, 1000000, g_frequency);
#elif defined(OSX)
unsigned long long absoluteTime = mach_absolute_time();
if (g_timebase.denom == 0)
g_timebase = queryTimebase();
return muldiv64(absoluteTime, g_timebase.numer, (uint64_t)g_timebase.denom * 1000);
#else
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
MORDOR_THROW_EXCEPTION_FROM_LAST_ERROR_API("clock_gettime");
return ts.tv_sec * 1000000ull + ts.tv_nsec / 1000;
#endif
}
namespace Mordor {
static Logger::ptr g_log = Log::lookup("mordor:timer");
#ifdef WINDOWS
static unsigned long long queryFrequency()
{
LARGE_INTEGER frequency;
BOOL bRet = QueryPerformanceFrequency(&frequency);
MORDOR_ASSERT(bRet);
return (unsigned long long)frequency.QuadPart;
}
unsigned long long g_frequency = queryFrequency();
#elif defined (OSX)
static mach_timebase_info_data_t queryTimebase()
{
mach_timebase_info_data_t timebase;
mach_timebase_info(&timebase);
return timebase;
}
mach_timebase_info_data_t g_timebase = queryTimebase();
#endif
unsigned long long
TimerManager::now()
{
#ifdef WINDOWS
LARGE_INTEGER count;
if (!QueryPerformanceCounter(&count))
MORDOR_THROW_EXCEPTION_FROM_LAST_ERROR_API("QueryPerformanceCounter");
unsigned long long countUll = (unsigned long long)count.QuadPart;
if (g_frequency == 0)
g_frequency = queryFrequency();
return countUll * 1000000 / g_frequency;
#elif defined(OSX)
unsigned long long absoluteTime = mach_absolute_time();
if (g_timebase.denom == 0)
g_timebase = queryTimebase();
return absoluteTime * g_timebase.numer / g_timebase.denom / 1000;
#else
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
MORDOR_THROW_EXCEPTION_FROM_LAST_ERROR_API("clock_gettime");
return ts.tv_sec * 1000000ull + ts.tv_nsec / 1000;
#endif
}
Timer::Timer(unsigned long long us, boost::function<void ()> dg, bool recurring,
TimerManager *manager)
: m_recurring(recurring),
m_us(us),
m_dg(dg),
m_manager(manager)
{
MORDOR_ASSERT(m_dg);
m_next = TimerManager::now() + m_us;
}
Timer::Timer(unsigned long long next)
: m_next(next)
{}
bool
Timer::cancel()
{
MORDOR_LOG_DEBUG(g_log) << this << " cancel";
boost::mutex::scoped_lock lock(m_manager->m_mutex);
if (m_dg) {
m_dg = NULL;
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_manager->m_timers.find(shared_from_this());
MORDOR_ASSERT(it != m_manager->m_timers.end());
m_manager->m_timers.erase(it);
return true;
}
return false;
}
bool
Timer::refresh()
{
boost::mutex::scoped_lock lock(m_manager->m_mutex);
if (!m_dg)
return false;
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_manager->m_timers.find(shared_from_this());
MORDOR_ASSERT(it != m_manager->m_timers.end());
m_manager->m_timers.erase(it);
m_next = TimerManager::now() + m_us;
m_manager->m_timers.insert(shared_from_this());
lock.unlock();
MORDOR_LOG_DEBUG(g_log) << this << " refresh";
return true;
}
bool
Timer::reset(unsigned long long us, bool fromNow)
{
boost::mutex::scoped_lock lock(m_manager->m_mutex);
if (!m_dg)
return false;
// No change
if (us == m_us && !fromNow)
return true;
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_manager->m_timers.find(shared_from_this());
MORDOR_ASSERT(it != m_manager->m_timers.end());
m_manager->m_timers.erase(it);
unsigned long long start;
if (fromNow)
start = TimerManager::now();
else
start = m_next - m_us;
m_us = us;
m_next = start + m_us;
it = m_manager->m_timers.insert(shared_from_this()).first;
bool atFront = (it == m_manager->m_timers.begin()) && !m_manager->m_tickled;
if (atFront)
m_manager->m_tickled = true;
lock.unlock();
MORDOR_LOG_DEBUG(g_log) << this << " reset to " << m_us;
if (atFront)
m_manager->onTimerInsertedAtFront();
return true;
}
TimerManager::TimerManager()
: m_tickled(false)
{}
TimerManager::~TimerManager()
{
#ifndef NDEBUG
boost::mutex::scoped_lock lock(m_mutex);
MORDOR_ASSERT(m_timers.empty());
#endif
}
Timer::ptr
TimerManager::registerTimer(unsigned long long us, boost::function<void ()> dg,
bool recurring)
{
MORDOR_ASSERT(dg);
Timer::ptr result(new Timer(us, dg, recurring, this));
boost::mutex::scoped_lock lock(m_mutex);
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_timers.insert(result).first;
bool atFront = (it == m_timers.begin()) && !m_tickled;
if (atFront)
m_tickled = true;
lock.unlock();
MORDOR_LOG_DEBUG(g_log) << result.get() << " registerTimer(" << us
<< ", " << recurring << "): " << atFront;
if (atFront)
onTimerInsertedAtFront();
return result;
}
unsigned long long
TimerManager::nextTimer()
{
boost::mutex::scoped_lock lock(m_mutex);
m_tickled = false;
if (m_timers.empty()) {
MORDOR_LOG_DEBUG(g_log) << this << " nextTimer(): ~0ull";
return ~0ull;
}
const Timer::ptr &next = *m_timers.begin();
unsigned long long nowUs = now();
unsigned long long result;
if (nowUs >= next->m_next)
result = 0;
else
result = next->m_next - nowUs;
MORDOR_LOG_DEBUG(g_log) << this << " nextTimer(): " << result;
return result;
}
std::vector<boost::function<void ()> >
TimerManager::processTimers()
{
std::vector<Timer::ptr> expired;
std::vector<boost::function<void ()> > result;
unsigned long long nowUs = now();
{
boost::mutex::scoped_lock lock(m_mutex);
if (m_timers.empty() || (*m_timers.begin())->m_next > nowUs)
return result;
Timer nowTimer(nowUs);
Timer::ptr nowTimerPtr(&nowTimer, &nop<Timer *>);
// Find all timers that are expired
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_timers.lower_bound(nowTimerPtr);
while (it != m_timers.end() && (*it)->m_next == nowUs ) ++it;
// Copy to expired, remove from m_timers;
expired.insert(expired.begin(), m_timers.begin(), it);
m_timers.erase(m_timers.begin(), it);
result.reserve(expired.size());
// Look at expired timers and re-register recurring timers
// (while under the same lock)
for (std::vector<Timer::ptr>::iterator it2(expired.begin());
it2 != expired.end();
++it2) {
Timer::ptr &timer = *it2;
MORDOR_ASSERT(timer->m_dg);
result.push_back(timer->m_dg);
if (timer->m_recurring) {
MORDOR_LOG_TRACE(g_log) << timer << " expired and refreshed";
timer->m_next = nowUs + timer->m_us;
m_timers.insert(timer);
} else {
MORDOR_LOG_TRACE(g_log) << timer << " expired";
timer->m_dg = NULL;
}
}
}
return result;
}
void
TimerManager::executeTimers()
{
std::vector<boost::function<void ()> > expired = processTimers();
// Run the callbacks for each expired timer (not under a lock)
for (std::vector<boost::function<void ()> >::iterator it(expired.begin());
it != expired.end();
++it) {
(*it)();
}
}
bool
Timer::Comparator::operator()(const Timer::ptr &lhs,
const Timer::ptr &rhs) const
{
// Order NULL before everything else
if (!lhs && !rhs)
return false;
if (!lhs)
return true;
if (!rhs)
return false;
// Order primarily on m_next
if (lhs->m_next < rhs->m_next)
return true;
if (rhs->m_next < lhs->m_next)
return false;
// Order by raw pointer for equivalent timeout values
return lhs.get() < rhs.get();
}
}
namespace Mordor {
boost::function<unsigned long long ()> TimerManager::ms_clockDg;
static Logger::ptr g_log = Log::lookup("mordor:timer");
// now() doesn't roll over at 0xffff...., because underlying hardware timers
// do not count in microseconds; also, prevent clock anomalies from causing
// timers that will never expire
static ConfigVar<unsigned long long>::ptr g_clockRolloverThreshold =
Config::lookup<unsigned long long>("timer.clockrolloverthreshold", 5000000ULL,
"Expire all timers if the clock goes backward by >= this amount");
static void
stubOnTimer(boost::weak_ptr<void> weakCond, boost::function<void ()> dg);
#ifdef WINDOWS
static unsigned long long queryFrequency()
{
LARGE_INTEGER frequency;
BOOL bRet = QueryPerformanceFrequency(&frequency);
MORDOR_ASSERT(bRet);
return (unsigned long long)frequency.QuadPart;
}
unsigned long long g_frequency = queryFrequency();
#elif defined (OSX)
static mach_timebase_info_data_t queryTimebase()
{
mach_timebase_info_data_t timebase;
mach_timebase_info(&timebase);
return timebase;
}
mach_timebase_info_data_t g_timebase = queryTimebase();
#endif
unsigned long long
TimerManager::now()
{
if (ms_clockDg)
return ms_clockDg();
#ifdef WINDOWS
LARGE_INTEGER count;
if (!QueryPerformanceCounter(&count))
MORDOR_THROW_EXCEPTION_FROM_LAST_ERROR_API("QueryPerformanceCounter");
unsigned long long countUll = (unsigned long long)count.QuadPart;
if (g_frequency == 0)
g_frequency = queryFrequency();
return muldiv64(countUll, 1000000, g_frequency);
#elif defined(OSX)
unsigned long long absoluteTime = mach_absolute_time();
if (g_timebase.denom == 0)
g_timebase = queryTimebase();
return muldiv64(absoluteTime, g_timebase.numer, (uint64_t)g_timebase.denom * 1000);
#else
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
MORDOR_THROW_EXCEPTION_FROM_LAST_ERROR_API("clock_gettime");
return ts.tv_sec * 1000000ull + ts.tv_nsec / 1000;
#endif
}
Timer::Timer(unsigned long long us, boost::function<void ()> dg, bool recurring,
TimerManager *manager)
: m_recurring(recurring),
m_us(us),
m_dg(dg),
m_manager(manager)
{
MORDOR_ASSERT(m_dg);
m_next = TimerManager::now() + m_us;
}
Timer::Timer(unsigned long long next)
: m_next(next)
{}
bool
Timer::cancel()
{
MORDOR_LOG_DEBUG(g_log) << this << " cancel";
boost::mutex::scoped_lock lock(m_manager->m_mutex);
if (m_dg) {
m_dg = NULL;
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_manager->m_timers.find(shared_from_this());
MORDOR_ASSERT(it != m_manager->m_timers.end());
m_manager->m_timers.erase(it);
return true;
}
return false;
}
bool
Timer::refresh()
{
boost::mutex::scoped_lock lock(m_manager->m_mutex);
if (!m_dg)
return false;
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_manager->m_timers.find(shared_from_this());
MORDOR_ASSERT(it != m_manager->m_timers.end());
m_manager->m_timers.erase(it);
m_next = TimerManager::now() + m_us;
m_manager->m_timers.insert(shared_from_this());
lock.unlock();
MORDOR_LOG_DEBUG(g_log) << this << " refresh";
return true;
}
bool
Timer::reset(unsigned long long us, bool fromNow)
{
boost::mutex::scoped_lock lock(m_manager->m_mutex);
if (!m_dg)
return false;
// No change
if (us == m_us && !fromNow)
return true;
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_manager->m_timers.find(shared_from_this());
MORDOR_ASSERT(it != m_manager->m_timers.end());
m_manager->m_timers.erase(it);
unsigned long long start;
if (fromNow)
start = TimerManager::now();
else
start = m_next - m_us;
m_us = us;
m_next = start + m_us;
it = m_manager->m_timers.insert(shared_from_this()).first;
bool atFront = (it == m_manager->m_timers.begin()) && !m_manager->m_tickled;
if (atFront)
m_manager->m_tickled = true;
lock.unlock();
MORDOR_LOG_DEBUG(g_log) << this << " reset to " << m_us;
if (atFront)
m_manager->onTimerInsertedAtFront();
return true;
}
TimerManager::TimerManager()
: m_tickled(false),
m_previousTime(0ull)
{}
TimerManager::~TimerManager()
{
#ifndef NDEBUG
boost::mutex::scoped_lock lock(m_mutex);
MORDOR_ASSERT(m_timers.empty());
#endif
}
Timer::ptr
TimerManager::registerTimer(unsigned long long us, boost::function<void ()> dg,
bool recurring)
{
MORDOR_ASSERT(dg);
Timer::ptr result(new Timer(us, dg, recurring, this));
boost::mutex::scoped_lock lock(m_mutex);
std::set<Timer::ptr, Timer::Comparator>::iterator it =
m_timers.insert(result).first;
bool atFront = (it == m_timers.begin()) && !m_tickled;
if (atFront)
m_tickled = true;
lock.unlock();
MORDOR_LOG_DEBUG(g_log) << result.get() << " registerTimer(" << us
<< ", " << recurring << "): " << atFront;
if (atFront)
onTimerInsertedAtFront();
return result;
}
Timer::ptr
TimerManager::registerConditionTimer(unsigned long long us,
boost::function<void ()> dg,
boost::weak_ptr<void> weakCond,
bool recurring)
{
return registerTimer(us,
boost::bind(stubOnTimer, weakCond, dg),
recurring);
}
static void
stubOnTimer(
boost::weak_ptr<void> weakCond, boost::function<void ()> dg)
{
boost::shared_ptr<void> temp = weakCond.lock();
if (temp) {
dg();
} else {
MORDOR_LOG_DEBUG(g_log) << " Conditionally skip in stubOnTimer!";
}
}
unsigned long long
TimerManager::nextTimer()
{
boost::mutex::scoped_lock lock(m_mutex);
m_tickled = false;
if (m_timers.empty()) {
MORDOR_LOG_DEBUG(g_log) << this << " nextTimer(): ~0ull";
return ~0ull;
}
const Timer::ptr &next = *m_timers.begin();
unsigned long long nowUs = now();
unsigned long long result;
if (nowUs >= next->m_next)
result = 0;
else
result = next->m_next - nowUs;
MORDOR_LOG_DEBUG(g_log) << this << " nextTimer(): " << result;
return result;
}
bool
TimerManager::detectClockRollover(unsigned long long nowUs)
{
// If the time jumps backward, expire timers (rather than have them
// expire in the distant future or not at all).
// We check this way because now() will not roll from 0xffff... to zero
// since the underlying hardware counter doesn't count microseconds.
// Use a threshold value so we don't overreact to minor clock jitter.
bool rollover = false;
if (nowUs < m_previousTime && // check first in case the next line would underflow
nowUs < m_previousTime - g_clockRolloverThreshold->val())
{
MORDOR_LOG_ERROR(g_log) << this << " clock has rolled back from "
<< m_previousTime << " to " << nowUs << "; expiring all timers";
rollover = true;
}
m_previousTime = nowUs;
return rollover;
}
std::vector<boost::function<void ()> >
TimerManager::processTimers()
{
std::vector<Timer::ptr> expired;
std::vector<boost::function<void ()> > result;
unsigned long long nowUs = now();
{
boost::mutex::scoped_lock lock(m_mutex);
if (m_timers.empty())
return result;
bool rollover = detectClockRollover(nowUs);
if (!rollover && (*m_timers.begin())->m_next > nowUs)
return result;
Timer nowTimer(nowUs);
Timer::ptr nowTimerPtr(&nowTimer, &nop<Timer *>);
// Find all timers that are expired
std::set<Timer::ptr, Timer::Comparator>::iterator it =
rollover ? m_timers.end() : m_timers.lower_bound(nowTimerPtr);
while (it != m_timers.end() && (*it)->m_next == nowUs ) ++it;
// Copy to expired, remove from m_timers;
expired.insert(expired.begin(), m_timers.begin(), it);
m_timers.erase(m_timers.begin(), it);
result.reserve(expired.size());
// Look at expired timers and re-register recurring timers
// (while under the same lock)
for (std::vector<Timer::ptr>::iterator it2(expired.begin());
it2 != expired.end();
++it2) {
Timer::ptr &timer = *it2;
MORDOR_ASSERT(timer->m_dg);
result.push_back(timer->m_dg);
if (timer->m_recurring) {
MORDOR_LOG_TRACE(g_log) << timer << " expired and refreshed";
timer->m_next = nowUs + timer->m_us;
m_timers.insert(timer);
} else {
MORDOR_LOG_TRACE(g_log) << timer << " expired";
timer->m_dg = NULL;
}
}
}
return result;
}
void
TimerManager::executeTimers()
{
std::vector<boost::function<void ()> > expired = processTimers();
// Run the callbacks for each expired timer (not under a lock)
for (std::vector<boost::function<void ()> >::iterator it(expired.begin());
it != expired.end();
++it) {
(*it)();
}
}
void
TimerManager::setClock(boost::function<unsigned long long()> dg)
{
ms_clockDg = dg;
}
bool
Timer::Comparator::operator()(const Timer::ptr &lhs,
const Timer::ptr &rhs) const
{
// Order NULL before everything else
if (!lhs && !rhs)
return false;
if (!lhs)
return true;
if (!rhs)
return false;
// Order primarily on m_next
if (lhs->m_next < rhs->m_next)
return true;
if (rhs->m_next < lhs->m_next)
return false;
// Order by raw pointer for equivalent timeout values
return lhs.get() < rhs.get();
}
}
