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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "Cond.h"
#include "Timer.h"
#define dout_subsys ceph_subsys_timer
#undef dout_prefix
#define dout_prefix *_dout << "timer(" << this << ")."
using std::pair;
using ceph::operator <<;
template <class Mutex>
class CommonSafeTimerThread : public Thread {
CommonSafeTimer<Mutex> *parent;
public:
explicit CommonSafeTimerThread(CommonSafeTimer<Mutex> *s) : parent(s) {}
void *entry() override {
parent->timer_thread();
return NULL;
}
};
template <class Mutex>
CommonSafeTimer<Mutex>::CommonSafeTimer(CephContext *cct_, Mutex &l, bool safe_callbacks)
: cct(cct_), lock(l),
safe_callbacks(safe_callbacks),
thread(NULL),
stopping(false)
{
}
template <class Mutex>
CommonSafeTimer<Mutex>::~CommonSafeTimer()
{
ceph_assert(thread == NULL);
}
template <class Mutex>
void CommonSafeTimer<Mutex>::init()
{
ldout(cct,10) << "init" << dendl;
thread = new CommonSafeTimerThread<Mutex>(this);
thread->create("safe_timer");
}
template <class Mutex>
void CommonSafeTimer<Mutex>::shutdown()
{
ldout(cct,10) << "shutdown" << dendl;
if (thread) {
ceph_assert(ceph_mutex_is_locked(lock));
cancel_all_events();
stopping = true;
cond.notify_all();
lock.unlock();
thread->join();
lock.lock();
delete thread;
thread = NULL;
}
}
template <class Mutex>
void CommonSafeTimer<Mutex>::timer_thread()
{
std::unique_lock l{lock};
ldout(cct,10) << "timer_thread starting" << dendl;
while (!stopping) {
auto now = clock_t::now();
while (!schedule.empty()) {
auto p = schedule.begin();
// is the future now?
if (p->first > now)
break;
Context *callback = p->second;
events.erase(callback);
schedule.erase(p);
ldout(cct,10) << "timer_thread executing " << callback << dendl;
if (!safe_callbacks) {
l.unlock();
callback->complete(0);
l.lock();
} else {
callback->complete(0);
}
}
// recheck stopping if we dropped the lock
if (!safe_callbacks && stopping)
break;
ldout(cct,20) << "timer_thread going to sleep" << dendl;
if (schedule.empty()) {
cond.wait(l);
} else {
auto when = schedule.begin()->first;
cond.wait_until(l, when);
}
ldout(cct,20) << "timer_thread awake" << dendl;
}
ldout(cct,10) << "timer_thread exiting" << dendl;
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_after(double seconds, Context *callback)
{
return add_event_after(ceph::make_timespan(seconds), callback);
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_after(ceph::timespan duration, Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
auto when = clock_t::now() + duration;
return add_event_at(when, callback);
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_at(CommonSafeTimer<Mutex>::clock_t::time_point when, Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
ldout(cct,10) << __func__ << " " << when << " -> " << callback << dendl;
if (stopping) {
ldout(cct,5) << __func__ << " already shutdown, event not added" << dendl;
delete callback;
return nullptr;
}
scheduled_map_t::value_type s_val(when, callback);
scheduled_map_t::iterator i = schedule.insert(s_val);
event_lookup_map_t::value_type e_val(callback, i);
pair < event_lookup_map_t::iterator, bool > rval(events.insert(e_val));
/* If you hit this, you tried to insert the same Context* twice. */
ceph_assert(rval.second);
/* If the event we have just inserted comes before everything else, we need to
* adjust our timeout. */
if (i == schedule.begin())
cond.notify_all();
return callback;
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_at(ceph::real_clock::time_point when, Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
// convert from real_clock to mono_clock
auto mono_now = ceph::mono_clock::now();
auto real_now = ceph::real_clock::now();
const auto delta = when - real_now;
const auto mono_atime = (mono_now +
std::chrono::ceil<clock_t::duration>(delta));
return add_event_at(mono_atime, callback);
}
template <class Mutex>
bool CommonSafeTimer<Mutex>::cancel_event(Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
auto p = events.find(callback);
if (p == events.end()) {
ldout(cct,10) << "cancel_event " << callback << " not found" << dendl;
return false;
}
ldout(cct,10) << "cancel_event " << p->second->first << " -> " << callback << dendl;
delete p->first;
schedule.erase(p->second);
events.erase(p);
return true;
}
template <class Mutex>
void CommonSafeTimer<Mutex>::cancel_all_events()
{
ldout(cct,10) << "cancel_all_events" << dendl;
ceph_assert(ceph_mutex_is_locked(lock));
while (!events.empty()) {
auto p = events.begin();
ldout(cct,10) << " cancelled " << p->second->first << " -> " << p->first << dendl;
delete p->first;
schedule.erase(p->second);
events.erase(p);
}
}
template <class Mutex>
void CommonSafeTimer<Mutex>::dump(const char *caller) const
{
if (!caller)
caller = "";
ldout(cct,10) << "dump " << caller << dendl;
for (scheduled_map_t::const_iterator s = schedule.begin();
s != schedule.end();
++s)
ldout(cct,10) << " " << s->first << "->" << s->second << dendl;
}
template class CommonSafeTimer<ceph::mutex>;
template class CommonSafeTimer<ceph::fair_mutex>;
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