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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 "Mutex.h"
#include "Thread.h"
#include "Timer.h"
#include "common/config.h"
#include "include/Context.h"
#define dout_subsys ceph_subsys_timer
#undef dout_prefix
#define dout_prefix *_dout << "timer(" << this << ")."
#include <sstream>
#include <signal.h>
#include <sys/time.h>
#include <math.h>
class SafeTimerThread : public Thread {
SafeTimer *parent;
public:
SafeTimerThread(SafeTimer *s) : parent(s) {}
void *entry() {
parent->timer_thread();
return NULL;
}
};
typedef std::multimap < utime_t, Context *> scheduled_map_t;
typedef std::map < Context*, scheduled_map_t::iterator > event_lookup_map_t;
SafeTimer::SafeTimer(CephContext *cct_, Mutex &l)
: cct(cct_), lock(l),
thread(NULL),
stopping(false)
{
}
SafeTimer::~SafeTimer()
{
assert(thread == NULL);
}
void SafeTimer::init()
{
ldout(cct,10) << "init" << dendl;
thread = new SafeTimerThread(this);
thread->create();
}
void SafeTimer::shutdown()
{
ldout(cct,10) << "shutdown" << dendl;
if (thread) {
assert(lock.is_locked());
cancel_all_events();
stopping = true;
cond.Signal();
lock.Unlock();
thread->join();
lock.Lock();
delete thread;
thread = NULL;
}
}
void SafeTimer::timer_thread()
{
lock.Lock();
ldout(cct,10) << "timer_thread starting" << dendl;
while (!stopping) {
utime_t now = ceph_clock_now(cct);
while (!schedule.empty()) {
scheduled_map_t::iterator 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;
callback->finish(0);
delete callback;
}
ldout(cct,20) << "timer_thread going to sleep" << dendl;
if (schedule.empty())
cond.Wait(lock);
else
cond.WaitUntil(lock, schedule.begin()->first);
ldout(cct,20) << "timer_thread awake" << dendl;
}
ldout(cct,10) << "timer_thread exiting" << dendl;
lock.Unlock();
}
void SafeTimer::add_event_after(double seconds, Context *callback)
{
assert(lock.is_locked());
utime_t when = ceph_clock_now(cct);
when += seconds;
add_event_at(when, callback);
}
void SafeTimer::add_event_at(utime_t when, Context *callback)
{
assert(lock.is_locked());
ldout(cct,10) << "add_event_at " << when << " -> " << callback << dendl;
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. */
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.Signal();
}
bool SafeTimer::cancel_event(Context *callback)
{
assert(lock.is_locked());
std::map<Context*, std::multimap<utime_t, Context*>::iterator>::iterator 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;
}
void SafeTimer::cancel_all_events()
{
ldout(cct,10) << "cancel_all_events" << dendl;
assert(lock.is_locked());
while (!events.empty()) {
std::map<Context*, std::multimap<utime_t, Context*>::iterator>::iterator p = events.begin();
ldout(cct,10) << " cancelled " << p->second->first << " -> " << p->first << dendl;
delete p->first;
schedule.erase(p->second);
events.erase(p);
}
}
void SafeTimer::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;
}
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