// Custom includes
#include <errno.h>
#include <sys/epoll.h>
-#include "Utils/Exception.hh"
+#include "../Utils/Exception.hh"
static const int EPollInitialSize = 16;
#define prefix_
///////////////////////////////cc.p////////////////////////////////////////
-prefix_ senf::Scheduler::Scheduler & senf::Scheduler::instance()
-{
- static Scheduler instance;
- return instance;
-}
-
-prefix_ void senf::Scheduler::timeout(sched_time timeout, TimerCallback const & cb)
-{
- timerQueue_.push(TimerSpec(now()+timeout,cb));
-}
-
prefix_ senf::Scheduler::Scheduler()
- : epollFd_ (epoll_create(EPollInitialSize)),
- epoch_ (boost::posix_time::microsec_clock::universal_time())
+ : timerIdCounter_(0), epollFd_ (epoll_create(EPollInitialSize)), terminate_(false),
+ eventTime_(0)
{
if (epollFd_<0)
throw SystemException(errno);
prefix_ void senf::Scheduler::process()
{
terminate_ = false;
+ eventTime_ = ClockService::now();
while (! terminate_) {
- sched_time timeNow = now();
- while ( ! timerQueue_.empty() && timerQueue_.top().timeout <= timeNow ) {
- timerQueue_.top().cb();
+ // Since a callback may have disabled further timers, we need to check for canceled timeouts
+ // again.
+
+ while (! timerQueue_.empty()) {
+ TimerMap::iterator i (timerQueue_.top());
+ if (! i->second.canceled)
+ break;
+ timerMap_.erase(i);
timerQueue_.pop();
}
- if (terminate_)
- return;
-
- int timeout (MinTimeout);
- if (! timerQueue_.empty()) {
- sched_time delta ((timerQueue_.top().timeout - timeNow)/1000000UL);
- if (delta<MinTimeout)
- timeout = int(delta);
+ int timeout (-1);
+ if (timerQueue_.empty()) {
+ if (fdTable_.empty())
+ break;
+ }
+ else {
+ ClockService::clock_type delta (
+ (timerQueue_.top()->second.timeout - eventTime_)/1000000UL);
+ timeout = delta < 0 ? 0 : delta;
}
+ ///\todo Handle more than one epoll_event per call
struct epoll_event ev;
int events = epoll_wait(epollFd_, &ev, 1, timeout);
if (events<0)
- // 'man epoll' says, epoll will not return with EINTR.
- throw SystemException(errno);
- if (events==0)
- // Timeout .. the handler will be run when going back to the loop top
+ if (errno != EINTR)
+ throw SystemException(errno);
+
+ eventTime_ = ClockService::now();
+
+ // We always run event handlers. This is important, even if a file-descriptor is signaled
+ // since some descriptors (e.g. real files) will *always* be ready and we still may want to
+ // handle timers.
+ // Time handlers are run before file events to not delay them unnecessarily.
+
+ while (! timerQueue_.empty()) {
+ TimerMap::iterator i (timerQueue_.top());
+ if (i->second.canceled)
+ ;
+ else if (i->second.timeout <= eventTime_)
+ i->second.cb();
+ else
+ break;
+ timerQueue_.pop();
+ timerMap_.erase(i);
+ }
+
+ if (events <= 0)
continue;
FdTable::iterator i = fdTable_.find(ev.data.fd);