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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) 2011 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.
*
*/
#ifndef CEPH_HEARTBEATMAP_H
#define CEPH_HEARTBEATMAP_H
#include <list>
#include <atomic>
#include <string>
#include <pthread.h>
#include "common/ceph_time.h"
#include "RWLock.h"
class CephContext;
namespace ceph {
/*
* HeartbeatMap -
*
* Maintain a set of handles for internal subsystems to periodically
* check in with a health check and timeout. Each user can register
* and get a handle they can use to set or reset a timeout.
*
* A simple is_healthy() method checks for any users who are not within
* their grace period for a heartbeat.
*/
struct heartbeat_handle_d {
const std::string name;
pthread_t thread_id;
// TODO: use atomic<time_point>, once we can ditch GCC 4.8
std::atomic<unsigned> timeout = { 0 }, suicide_timeout = { 0 };
time_t grace, suicide_grace;
std::list<heartbeat_handle_d*>::iterator list_item;
explicit heartbeat_handle_d(const std::string& n)
: name(n), thread_id(0), grace(0), suicide_grace(0)
{ }
};
class HeartbeatMap {
public:
// register/unregister
heartbeat_handle_d *add_worker(const std::string& name, pthread_t thread_id);
void remove_worker(const heartbeat_handle_d *h);
// reset the timeout so that it expects another touch within grace amount of time
void reset_timeout(heartbeat_handle_d *h,
ceph::coarse_mono_clock::rep grace,
ceph::coarse_mono_clock::rep suicide_grace);
// clear the timeout so that it's not checked on
void clear_timeout(heartbeat_handle_d *h);
// return false if any of the timeouts are currently expired.
bool is_healthy();
// touch cct->_conf->heartbeat_file if is_healthy()
void check_touch_file();
// get the number of unhealthy workers
int get_unhealthy_workers() const;
// get the number of total workers
int get_total_workers() const;
explicit HeartbeatMap(CephContext *cct);
~HeartbeatMap();
private:
CephContext *m_cct;
RWLock m_rwlock;
ceph::coarse_mono_clock::time_point m_inject_unhealthy_until;
std::list<heartbeat_handle_d*> m_workers;
std::atomic<unsigned> m_unhealthy_workers = { 0 };
std::atomic<unsigned> m_total_workers = { 0 };
bool _check(const heartbeat_handle_d *h, const char *who,
ceph::coarse_mono_clock::rep now);
};
}
#endif
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