// $Id$
//
// Copyright (C) 2006
-// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
-// Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
-// Stefan Bund <stefan.bund@fokus.fraunhofer.de>
+// Fraunhofer Institute for Open Communication Systems (FOKUS)
+// Competence Center NETwork research (NET), St. Augustin, GERMANY
+// Stefan Bund <g0dil@berlios.de>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
/** \file
\brief Scheduler non-inline non-template implementation
- \idea Implement signal handling (See source for more discussion
- about this)
-
\idea Multithreading support: To support multithreading, the
static member Scheduler::instance() must return a thread-local
value (that is Scheduler::instance() must allocate one Scheduler
threads)
*/
-// Here a basic concept of how to add signal support to the scheduler:
-//
-// Every signal to be reported by the scheduler will be asigned a
-// generic signal handler by the scheduler. This signal handler will
-// use longjmp (juck) to report this signal back to the scheduler
-// main-loop.
-//
-// To make this safe, the main-loop will look something like:
-//
-// int signal = setjmp(jmpBuffer_);
-// if (signal == 0) {
-// // unblock all signals which are registered with the
-// // scheduler
-// // call epoll
-// // block all relevant signals again
-// }
-//
-// // now handle the event
-//
-// The signal handler is then simply defined as
-//
-// static void Scheduler::sigHandler(int signal)
-// {
-// // make sure to restore the signal handler here if
-// // necessary
-// longjmp(Scheduler::instance().jmpBuffer_,signal);
-// }
-//
-// You should use sigaction to register the signal handlers and define
-// a sa_mask so all Scheduler-registered signals are automatically
-// *blocked* whenever one of the signals is called (including the
-// called signal!) (This also means, we will have to re-register all
-// signals if we change the registration of some signal since the
-// sa_mask changes). This ensures, that no two signals can be
-// delivered on top of each other. And of course any signal registered
-// with the scheduler must be blocked as soon as it is registered with
-// the scheduler.
-
#include "Scheduler.hh"
//#include "Scheduler.ih"
// Custom includes
-#include <errno.h>
-#include <sys/epoll.h>
-#include "../Utils/Exception.hh"
-
-static const int EPollInitialSize = 16;
#define prefix_
///////////////////////////////cc.p////////////////////////////////////////
-prefix_ senf::Scheduler::Scheduler()
- : timerIdCounter_(0), epollFd_ (epoll_create(EPollInitialSize)), terminate_(false),
- eventTime_(0)
-{
- if (epollFd_<0)
- throw SystemException(errno);
-}
-
-prefix_ void senf::Scheduler::do_add(int fd, SimpleCallback const & cb, int eventMask)
-{
- FdTable::iterator i (fdTable_.find(fd));
- int action (EPOLL_CTL_MOD);
- if (i == fdTable_.end()) {
- action = EPOLL_CTL_ADD;
- i = fdTable_.insert(std::make_pair(fd, EventSpec())).first;
- }
-
- if (eventMask & EV_READ) i->second.cb_read = cb;
- if (eventMask & EV_PRIO) i->second.cb_prio = cb;
- if (eventMask & EV_WRITE) i->second.cb_write = cb;
-
- epoll_event ev;
- memset(&ev,0,sizeof(ev));
- ev.events = i->second.epollMask();
- ev.data.fd = fd;
-
- if (epoll_ctl(epollFd_, action, fd, &ev)<0)
- throw SystemException(errno);
-}
-
-prefix_ void senf::Scheduler::do_remove(int fd, int eventMask)
+prefix_ void senf::Scheduler::process()
{
- FdTable::iterator i (fdTable_.find(fd));
- if (i == fdTable_.end())
- return;
-
- if (eventMask & EV_READ) i->second.cb_read = 0;
- if (eventMask & EV_PRIO) i->second.cb_prio = 0;
- if (eventMask & EV_WRITE) i->second.cb_write = 0;
-
- epoll_event ev;
- memset(&ev,0,sizeof(ev));
- ev.events = i->second.epollMask();
- ev.data.fd = fd;
-
- int action (EPOLL_CTL_MOD);
- if (ev.events==0) {
- action = EPOLL_CTL_DEL;
- fdTable_.erase(i);
+ terminate_ = false;
+ while(! terminate_ && ! (fdDispatcher_.empty() &&
+ timerDispatcher_.empty() &&
+ fileDispatcher_.empty())) {
+ signalDispatcher_.unblockSignals();
+ timerDispatcher_.unblockSignals();
+ manager_.processOnce();
+ timerDispatcher_.blockSignals();
+ signalDispatcher_.blockSignals();
+ fileDispatcher_.prepareRun();
+ runner_.run();
}
-
- if (epoll_ctl(epollFd_, action, fd, &ev)<0)
- throw SystemException(errno);
}
+///////////////////////////////////////////////////////////////////////////
+// senf::SchedulerLogTimeSource
-prefix_ int senf::Scheduler::EventSpec::epollMask()
+prefix_ senf::log::time_type senf::SchedulerLogTimeSource::operator()()
const
{
- int mask (0);
- if (cb_read) mask |= EPOLLIN;
- if (cb_prio) mask |= EPOLLPRI;
- if (cb_write) mask |= EPOLLOUT;
- return mask;
-}
-
-prefix_ void senf::Scheduler::process()
-{
- terminate_ = false;
- eventTime_ = ClockService::now();
- while (! terminate_) {
-
- // 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();
- }
-
- 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)
- 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;
- timerMap_.erase(i);
- timerQueue_.pop();
- }
-
- if (events <= 0)
- continue;
-
- FdTable::iterator i = fdTable_.find(ev.data.fd);
- BOOST_ASSERT (i != fdTable_.end() );
- EventSpec spec (i->second);
-
- unsigned extraFlags (0);
- if (ev.events & EPOLLHUP) extraFlags |= EV_HUP;
- if (ev.events & EPOLLERR) extraFlags |= EV_ERR;
-
- if (ev.events & EPOLLIN) {
- BOOST_ASSERT(spec.cb_read);
- spec.cb_read(EventId(EV_READ | extraFlags));
- }
- else if (ev.events & EPOLLPRI) {
- BOOST_ASSERT(spec.cb_prio);
- spec.cb_prio(EventId(EV_PRIO | extraFlags));
- }
- else if (ev.events & EPOLLOUT) {
- BOOST_ASSERT(spec.cb_write);
- spec.cb_write(EventId(EV_WRITE | extraFlags));
- }
- else {
- // This branch is only taken, if HUP or ERR is signaled but none of IN/OUT/PRI.
- // In this case we will signal all registered callbacks. The callbacks must be
- // prepared to be called multiple times if they are registered to more than
- // one event.
- if (spec.cb_write)
- spec.cb_write(EventId(extraFlags));
- if (spec.cb_prio)
- spec.cb_prio(EventId(extraFlags));
- if (spec.cb_read)
- spec.cb_read(EventId(extraFlags));
- }
- }
+ return Scheduler::instance().eventTime();
}
///////////////////////////////cc.e////////////////////////////////////////
projects / senf.git / blobdiff