[ceph.git] / ceph / src / common / WorkQueue.cc

// -*- 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 "WorkQueue.h"
#include "include/compat.h"
#include "common/errno.h"

#define dout_subsys ceph_subsys_tp
#undef dout_prefix
#define dout_prefix *_dout << name << " "


ThreadPool::ThreadPool(CephContext *cct_, string nm, string tn, int n, const char *option)
  : cct(cct_), name(std::move(nm)), thread_name(std::move(tn)),
    lockname(name + "::lock"),
    _lock(ceph::make_mutex(lockname)),  // this should be safe due to declaration order
    _stop(false),
    _pause(0),
    _draining(0),
    _num_threads(n),
    processing(0)
{
  if (option) {
    _thread_num_option = option;
    // set up conf_keys
    _conf_keys = new const char*[2];
    _conf_keys[0] = _thread_num_option.c_str();
    _conf_keys[1] = NULL;
  } else {
    _conf_keys = new const char*[1];
    _conf_keys[0] = NULL;
  }
}

void ThreadPool::TPHandle::suspend_tp_timeout()
{
  cct->get_heartbeat_map()->clear_timeout(hb);
}

void ThreadPool::TPHandle::reset_tp_timeout()
{
  cct->get_heartbeat_map()->reset_timeout(
    hb, grace, suicide_grace);
}

ThreadPool::~ThreadPool()
{
  ceph_assert(_threads.empty());
  delete[] _conf_keys;
}

void ThreadPool::handle_conf_change(const ConfigProxy& conf,
				    const std::set <std::string> &changed)
{
  if (changed.count(_thread_num_option)) {
    char *buf;
    int r = conf.get_val(_thread_num_option.c_str(), &buf, -1);
    ceph_assert(r >= 0);
    int v = atoi(buf);
    free(buf);
    if (v >= 0) {
      _lock.lock();
      _num_threads = v;
      start_threads();
      _cond.notify_all();
      _lock.unlock();
    }
  }
}

void ThreadPool::worker(WorkThread *wt)
{
  std::unique_lock ul(_lock);
  ldout(cct,10) << "worker start" << dendl;
  
  std::stringstream ss;
  ss << name << " thread " << (void *)pthread_self();
  heartbeat_handle_d *hb = cct->get_heartbeat_map()->add_worker(ss.str(), pthread_self());

  while (!_stop) {

    // manage dynamic thread pool
    join_old_threads();
    if (_threads.size() > _num_threads) {
      ldout(cct,1) << " worker shutting down; too many threads (" << _threads.size() << " > " << _num_threads << ")" << dendl;
      _threads.erase(wt);
      _old_threads.push_back(wt);
      break;
    }

    if (!_pause && !work_queues.empty()) {
      WorkQueue_* wq;
      int tries = 2 * work_queues.size();
      bool did = false;
      while (tries--) {
	next_work_queue %= work_queues.size();
	wq = work_queues[next_work_queue++];
	
	void *item = wq->_void_dequeue();
	if (item) {
	  processing++;
	  ldout(cct,12) << "worker wq " << wq->name << " start processing " << item
			<< " (" << processing << " active)" << dendl;
	  TPHandle tp_handle(cct, hb, wq->timeout_interval, wq->suicide_interval);
	  tp_handle.reset_tp_timeout();
	  ul.unlock();
	  wq->_void_process(item, tp_handle);
	  ul.lock();
	  wq->_void_process_finish(item);
	  processing--;
	  ldout(cct,15) << "worker wq " << wq->name << " done processing " << item
			<< " (" << processing << " active)" << dendl;
	  if (_pause || _draining)
	    _wait_cond.notify_all();
	  did = true;
	  break;
	}
      }
      if (did)
	continue;
    }

    ldout(cct,20) << "worker waiting" << dendl;
    cct->get_heartbeat_map()->reset_timeout(
      hb,
      cct->_conf->threadpool_default_timeout,
      0);
    auto wait = std::chrono::seconds(
      cct->_conf->threadpool_empty_queue_max_wait);
    _cond.wait_for(ul, wait);
  }
  ldout(cct,1) << "worker finish" << dendl;

  cct->get_heartbeat_map()->remove_worker(hb);
}

void ThreadPool::start_threads()
{
  ceph_assert(ceph_mutex_is_locked(_lock));
  while (_threads.size() < _num_threads) {
    WorkThread *wt = new WorkThread(this);
    ldout(cct, 10) << "start_threads creating and starting " << wt << dendl;
    _threads.insert(wt);

    wt->create(thread_name.c_str());
  }
}

void ThreadPool::join_old_threads()
{
  ceph_assert(ceph_mutex_is_locked(_lock));
  while (!_old_threads.empty()) {
    ldout(cct, 10) << "join_old_threads joining and deleting " << _old_threads.front() << dendl;
    _old_threads.front()->join();
    delete _old_threads.front();
    _old_threads.pop_front();
  }
}

void ThreadPool::start()
{
  ldout(cct,10) << "start" << dendl;

  if (_thread_num_option.length()) {
    ldout(cct, 10) << " registering config observer on " << _thread_num_option << dendl;
    cct->_conf.add_observer(this);
  }

  _lock.lock();
  start_threads();
  _lock.unlock();
  ldout(cct,15) << "started" << dendl;
}

void ThreadPool::stop(bool clear_after)
{
  ldout(cct,10) << "stop" << dendl;

  if (_thread_num_option.length()) {
    ldout(cct, 10) << " unregistering config observer on " << _thread_num_option << dendl;
    cct->_conf.remove_observer(this);
  }

  _lock.lock();
  _stop = true;
  _cond.notify_all();
  join_old_threads();
  _lock.unlock();
  for (set<WorkThread*>::iterator p = _threads.begin();
       p != _threads.end();
       ++p) {
    (*p)->join();
    delete *p;
  }
  _threads.clear();
  _lock.lock();
  for (unsigned i=0; i<work_queues.size(); i++)
    work_queues[i]->_clear();
  _stop = false;
  _lock.unlock();
  ldout(cct,15) << "stopped" << dendl;
}

void ThreadPool::pause()
{
  std::unique_lock ul(_lock);
  ldout(cct,10) << "pause" << dendl;
  _pause++;
  while (processing) {
    _wait_cond.wait(ul);
  }
  ldout(cct,15) << "paused" << dendl;
}

void ThreadPool::pause_new()
{
  ldout(cct,10) << "pause_new" << dendl;
  _lock.lock();
  _pause++;
  _lock.unlock();
}

void ThreadPool::unpause()
{
  ldout(cct,10) << "unpause" << dendl;
  _lock.lock();
  ceph_assert(_pause > 0);
  _pause--;
  _cond.notify_all();
  _lock.unlock();
}

void ThreadPool::drain(WorkQueue_* wq)
{
  std::unique_lock ul(_lock);
  ldout(cct,10) << "drain" << dendl;
  _draining++;
  while (processing || (wq != NULL && !wq->_empty())) {
    _wait_cond.wait(ul);
  }
  _draining--;
}

ShardedThreadPool::ShardedThreadPool(CephContext *pcct_, string nm, string tn,
  uint32_t pnum_threads):
  cct(pcct_),
  name(std::move(nm)),
  thread_name(std::move(tn)),
  lockname(name + "::lock"),
  shardedpool_lock(ceph::make_mutex(lockname)),
  num_threads(pnum_threads),
  num_paused(0),
  num_drained(0),
  wq(NULL) {}

void ShardedThreadPool::shardedthreadpool_worker(uint32_t thread_index)
{
  ceph_assert(wq != NULL);
  ldout(cct,10) << "worker start" << dendl;

  std::stringstream ss;
  ss << name << " thread " << (void *)pthread_self();
  heartbeat_handle_d *hb = cct->get_heartbeat_map()->add_worker(ss.str(), pthread_self());

  while (!stop_threads) {
    if (pause_threads) {
      std::unique_lock ul(shardedpool_lock);
      ++num_paused;
      wait_cond.notify_all();
      while (pause_threads) {
       cct->get_heartbeat_map()->reset_timeout(
	        hb,
	        wq->timeout_interval, wq->suicide_interval);
       shardedpool_cond.wait_for(
	 ul,
	 std::chrono::seconds(cct->_conf->threadpool_empty_queue_max_wait));
      }
      --num_paused;
    }
    if (drain_threads) {
      std::unique_lock ul(shardedpool_lock);
      if (wq->is_shard_empty(thread_index)) {
        ++num_drained;
        wait_cond.notify_all();
        while (drain_threads) {
	  cct->get_heartbeat_map()->reset_timeout(
	    hb,
	    wq->timeout_interval, wq->suicide_interval);
          shardedpool_cond.wait_for(
	    ul,
	    std::chrono::seconds(cct->_conf->threadpool_empty_queue_max_wait));
        }
        --num_drained;
      }
    }

    cct->get_heartbeat_map()->reset_timeout(
      hb,
      wq->timeout_interval, wq->suicide_interval);
    wq->_process(thread_index, hb);

  }

  ldout(cct,10) << "sharded worker finish" << dendl;

  cct->get_heartbeat_map()->remove_worker(hb);

}

void ShardedThreadPool::start_threads()
{
  ceph_assert(ceph_mutex_is_locked(shardedpool_lock));
  int32_t thread_index = 0;
  while (threads_shardedpool.size() < num_threads) {

    WorkThreadSharded *wt = new WorkThreadSharded(this, thread_index);
    ldout(cct, 10) << "start_threads creating and starting " << wt << dendl;
    threads_shardedpool.push_back(wt);
    wt->create(thread_name.c_str());
    thread_index++;
  }
}

void ShardedThreadPool::start()
{
  ldout(cct,10) << "start" << dendl;

  shardedpool_lock.lock();
  start_threads();
  shardedpool_lock.unlock();
  ldout(cct,15) << "started" << dendl;
}

void ShardedThreadPool::stop()
{
  ldout(cct,10) << "stop" << dendl;
  stop_threads = true;
  ceph_assert(wq != NULL);
  wq->return_waiting_threads();
  for (vector<WorkThreadSharded*>::iterator p = threads_shardedpool.begin();
       p != threads_shardedpool.end();
       ++p) {
    (*p)->join();
    delete *p;
  }
  threads_shardedpool.clear();
  ldout(cct,15) << "stopped" << dendl;
}

void ShardedThreadPool::pause()
{
  std::unique_lock ul(shardedpool_lock);
  ldout(cct,10) << "pause" << dendl;
  pause_threads = true;
  ceph_assert(wq != NULL);
  wq->return_waiting_threads();
  while (num_threads != num_paused){
    wait_cond.wait(ul);
  }
  ldout(cct,10) << "paused" << dendl; 
}

void ShardedThreadPool::pause_new()
{
  ldout(cct,10) << "pause_new" << dendl;
  shardedpool_lock.lock();
  pause_threads = true;
  ceph_assert(wq != NULL);
  wq->return_waiting_threads();
  shardedpool_lock.unlock();
  ldout(cct,10) << "paused_new" << dendl;
}

void ShardedThreadPool::unpause()
{
  ldout(cct,10) << "unpause" << dendl;
  shardedpool_lock.lock();
  pause_threads = false;
  wq->stop_return_waiting_threads();
  shardedpool_cond.notify_all();
  shardedpool_lock.unlock();
  ldout(cct,10) << "unpaused" << dendl;
}

void ShardedThreadPool::drain()
{
  std::unique_lock ul(shardedpool_lock);
  ldout(cct,10) << "drain" << dendl;
  drain_threads = true;
  ceph_assert(wq != NULL);
  wq->return_waiting_threads();
  while (num_threads != num_drained) {
    wait_cond.wait(ul);
  }
  drain_threads = false;
  wq->stop_return_waiting_threads();
  shardedpool_cond.notify_all();
  ldout(cct,10) << "drained" << dendl;
}
Commit	Line	Data
7c673cae FG	1	// -- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t --
	2	// vim: ts=8 sw=2 smarttab
	3	/*
	4	* Ceph - scalable distributed file system
	5	*
	6	* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
	7	*
	8	* This is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License version 2.1, as published by the Free Software
	11	* Foundation. See file COPYING.
	12	*
	13	*/
	14
31f18b77	15	#include "WorkQueue.h"
7c673cae	16	#include "include/compat.h"
7c673cae	17	#include "common/errno.h"
7c673cae FG	18
	19	#define dout_subsys ceph_subsys_tp
	20	#undef dout_prefix
	21	#define dout_prefix *_dout << name << " "
	22
	23
	24	ThreadPool::ThreadPool(CephContext cct_, string nm, string tn, int n, const char option)
	25	: cct(cct_), name(std::move(nm)), thread_name(std::move(tn)),
	26	lockname(name + "::lock"),
11fdf7f2	27	_lock(ceph::make_mutex(lockname)), // this should be safe due to declaration order
7c673cae FG	28	_stop(false),
	29	_pause(0),
	30	_draining(0),
7c673cae FG	31	_num_threads(n),
	32	processing(0)
	33	{
	34	if (option) {
	35	_thread_num_option = option;
	36	// set up conf_keys
	37	_conf_keys = new const char*[2];
	38	_conf_keys[0] = _thread_num_option.c_str();
	39	_conf_keys[1] = NULL;
	40	} else {
	41	_conf_keys = new const char*[1];
	42	_conf_keys[0] = NULL;
	43	}
	44	}
	45
	46	void ThreadPool::TPHandle::suspend_tp_timeout()
	47	{
	48	cct->get_heartbeat_map()->clear_timeout(hb);
	49	}
	50
	51	void ThreadPool::TPHandle::reset_tp_timeout()
	52	{
	53	cct->get_heartbeat_map()->reset_timeout(
	54	hb, grace, suicide_grace);
	55	}
	56
	57	ThreadPool::~ThreadPool()
	58	{
11fdf7f2	59	ceph_assert(_threads.empty());
7c673cae FG	60	delete[] _conf_keys;
	61	}
	62
11fdf7f2	63	void ThreadPool::handle_conf_change(const ConfigProxy& conf,
7c673cae FG	64	const std::set <std::string> &changed)
	65	{
	66	if (changed.count(_thread_num_option)) {
	67	char *buf;
11fdf7f2 TL	68	int r = conf.get_val(_thread_num_option.c_str(), &buf, -1);
11fdf7f2 TL	69	ceph_assert(r >= 0);
7c673cae FG	70	int v = atoi(buf);
	71	free(buf);
	72	if (v >= 0) {
11fdf7f2	73	_lock.lock();
7c673cae FG	74	_num_threads = v;
7c673cae FG	75	start_threads();
11fdf7f2 TL	76	_cond.notify_all();
11fdf7f2 TL	77	_lock.unlock();
7c673cae FG	78	}
	79	}
	80	}
	81
	82	void ThreadPool::worker(WorkThread *wt)
	83	{
11fdf7f2	84	std::unique_lock ul(_lock);
7c673cae FG	85	ldout(cct,10) << "worker start" << dendl;
	86
	87	std::stringstream ss;
c07f9fc5	88	ss << name << " thread " << (void *)pthread_self();
7c673cae FG	89	heartbeat_handle_d *hb = cct->get_heartbeat_map()->add_worker(ss.str(), pthread_self());
	90
	91	while (!_stop) {
	92
	93	// manage dynamic thread pool
	94	join_old_threads();
	95	if (_threads.size() > _num_threads) {
	96	ldout(cct,1) << " worker shutting down; too many threads (" << _threads.size() << " > " << _num_threads << ")" << dendl;
	97	_threads.erase(wt);
	98	_old_threads.push_back(wt);
	99	break;
	100	}
	101
	102	if (!_pause && !work_queues.empty()) {
	103	WorkQueue_* wq;
11fdf7f2	104	int tries = 2 * work_queues.size();
7c673cae FG	105	bool did = false;
	106	while (tries--) {
	107	next_work_queue %= work_queues.size();
	108	wq = work_queues[next_work_queue++];
	109
	110	void *item = wq->_void_dequeue();
	111	if (item) {
	112	processing++;
	113	ldout(cct,12) << "worker wq " << wq->name << " start processing " << item
	114	<< " (" << processing << " active)" << dendl;
	115	TPHandle tp_handle(cct, hb, wq->timeout_interval, wq->suicide_interval);
	116	tp_handle.reset_tp_timeout();
11fdf7f2	117	ul.unlock();
7c673cae	118	wq->_void_process(item, tp_handle);
11fdf7f2	119	ul.lock();
7c673cae FG	120	wq->_void_process_finish(item);
	121	processing--;
	122	ldout(cct,15) << "worker wq " << wq->name << " done processing " << item
	123	<< " (" << processing << " active)" << dendl;
	124	if (_pause \|\| _draining)
11fdf7f2	125	_wait_cond.notify_all();
7c673cae FG	126	did = true;
	127	break;
	128	}
	129	}
	130	if (did)
	131	continue;
	132	}
	133
	134	ldout(cct,20) << "worker waiting" << dendl;
	135	cct->get_heartbeat_map()->reset_timeout(
	136	hb,
	137	cct->_conf->threadpool_default_timeout,
	138	0);
11fdf7f2 TL	139	auto wait = std::chrono::seconds(
	140	cct->_conf->threadpool_empty_queue_max_wait);
	141	_cond.wait_for(ul, wait);
7c673cae FG	142	}
	143	ldout(cct,1) << "worker finish" << dendl;
	144
	145	cct->get_heartbeat_map()->remove_worker(hb);
7c673cae FG	146	}
	147
	148	void ThreadPool::start_threads()
	149	{
11fdf7f2	150	ceph_assert(ceph_mutex_is_locked(_lock));
7c673cae FG	151	while (_threads.size() < _num_threads) {
	152	WorkThread *wt = new WorkThread(this);
	153	ldout(cct, 10) << "start_threads creating and starting " << wt << dendl;
	154	_threads.insert(wt);
	155
7c673cae FG	156	wt->create(thread_name.c_str());
	157	}
	158	}
	159
	160	void ThreadPool::join_old_threads()
	161	{
11fdf7f2	162	ceph_assert(ceph_mutex_is_locked(_lock));
7c673cae FG	163	while (!_old_threads.empty()) {
	164	ldout(cct, 10) << "join_old_threads joining and deleting " << _old_threads.front() << dendl;
	165	_old_threads.front()->join();
	166	delete _old_threads.front();
	167	_old_threads.pop_front();
	168	}
	169	}
	170
	171	void ThreadPool::start()
	172	{
	173	ldout(cct,10) << "start" << dendl;
	174
	175	if (_thread_num_option.length()) {
	176	ldout(cct, 10) << " registering config observer on " << _thread_num_option << dendl;
11fdf7f2	177	cct->_conf.add_observer(this);
7c673cae FG	178	}
7c673cae FG	179
11fdf7f2	180	_lock.lock();
7c673cae	181	start_threads();
11fdf7f2	182	_lock.unlock();
7c673cae FG	183	ldout(cct,15) << "started" << dendl;
	184	}
	185
	186	void ThreadPool::stop(bool clear_after)
	187	{
	188	ldout(cct,10) << "stop" << dendl;
	189
	190	if (_thread_num_option.length()) {
	191	ldout(cct, 10) << " unregistering config observer on " << _thread_num_option << dendl;
11fdf7f2	192	cct->_conf.remove_observer(this);
7c673cae FG	193	}
7c673cae FG	194
11fdf7f2	195	_lock.lock();
7c673cae	196	_stop = true;
11fdf7f2	197	_cond.notify_all();
7c673cae	198	join_old_threads();
11fdf7f2	199	_lock.unlock();
7c673cae FG	200	for (set<WorkThread*>::iterator p = _threads.begin();
	201	p != _threads.end();
	202	++p) {
	203	(*p)->join();
	204	delete *p;
	205	}
	206	_threads.clear();
11fdf7f2	207	_lock.lock();
7c673cae FG	208	for (unsigned i=0; i<work_queues.size(); i++)
	209	work_queues[i]->_clear();
	210	_stop = false;
11fdf7f2	211	_lock.unlock();
7c673cae FG	212	ldout(cct,15) << "stopped" << dendl;
	213	}
	214
	215	void ThreadPool::pause()
	216	{
11fdf7f2	217	std::unique_lock ul(_lock);
7c673cae	218	ldout(cct,10) << "pause" << dendl;
7c673cae	219	_pause++;
11fdf7f2 TL	220	while (processing) {
	221	_wait_cond.wait(ul);
	222	}
7c673cae FG	223	ldout(cct,15) << "paused" << dendl;
	224	}
	225
	226	void ThreadPool::pause_new()
	227	{
	228	ldout(cct,10) << "pause_new" << dendl;
11fdf7f2	229	_lock.lock();
7c673cae	230	_pause++;
11fdf7f2	231	_lock.unlock();
7c673cae FG	232	}
	233
	234	void ThreadPool::unpause()
	235	{
	236	ldout(cct,10) << "unpause" << dendl;
11fdf7f2 TL	237	_lock.lock();
11fdf7f2 TL	238	ceph_assert(_pause > 0);
7c673cae	239	_pause--;
11fdf7f2 TL	240	_cond.notify_all();
11fdf7f2 TL	241	_lock.unlock();
7c673cae FG	242	}
	243
	244	void ThreadPool::drain(WorkQueue_* wq)
	245	{
11fdf7f2	246	std::unique_lock ul(_lock);
7c673cae	247	ldout(cct,10) << "drain" << dendl;
7c673cae	248	_draining++;
11fdf7f2 TL	249	while (processing \|\| (wq != NULL && !wq->_empty())) {
11fdf7f2 TL	250	_wait_cond.wait(ul);
7c673cae	251	}
11fdf7f2	252	_draining--;
7c673cae FG	253	}
	254
	255	ShardedThreadPool::ShardedThreadPool(CephContext *pcct_, string nm, string tn,
	256	uint32_t pnum_threads):
	257	cct(pcct_),
	258	name(std::move(nm)),
	259	thread_name(std::move(tn)),
	260	lockname(name + "::lock"),
11fdf7f2	261	shardedpool_lock(ceph::make_mutex(lockname)),
7c673cae	262	num_threads(pnum_threads),
7c673cae FG	263	num_paused(0),
	264	num_drained(0),
	265	wq(NULL) {}
	266
	267	void ShardedThreadPool::shardedthreadpool_worker(uint32_t thread_index)
	268	{
11fdf7f2	269	ceph_assert(wq != NULL);
7c673cae FG	270	ldout(cct,10) << "worker start" << dendl;
	271
	272	std::stringstream ss;
c07f9fc5	273	ss << name << " thread " << (void *)pthread_self();
7c673cae FG	274	heartbeat_handle_d *hb = cct->get_heartbeat_map()->add_worker(ss.str(), pthread_self());
7c673cae FG	275
31f18b77 FG	276	while (!stop_threads) {
31f18b77 FG	277	if (pause_threads) {
11fdf7f2	278	std::unique_lock ul(shardedpool_lock);
7c673cae	279	++num_paused;
11fdf7f2	280	wait_cond.notify_all();
31f18b77	281	while (pause_threads) {
7c673cae	282	cct->get_heartbeat_map()->reset_timeout(
31f18b77 FG	283	hb,
31f18b77 FG	284	wq->timeout_interval, wq->suicide_interval);
11fdf7f2 TL	285	shardedpool_cond.wait_for(
	286	ul,
	287	std::chrono::seconds(cct->_conf->threadpool_empty_queue_max_wait));
7c673cae FG	288	}
7c673cae FG	289	--num_paused;
7c673cae	290	}
31f18b77	291	if (drain_threads) {
11fdf7f2	292	std::unique_lock ul(shardedpool_lock);
7c673cae FG	293	if (wq->is_shard_empty(thread_index)) {
7c673cae FG	294	++num_drained;
11fdf7f2	295	wait_cond.notify_all();
31f18b77	296	while (drain_threads) {
7c673cae FG	297	cct->get_heartbeat_map()->reset_timeout(
	298	hb,
	299	wq->timeout_interval, wq->suicide_interval);
11fdf7f2 TL	300	shardedpool_cond.wait_for(
	301	ul,
	302	std::chrono::seconds(cct->_conf->threadpool_empty_queue_max_wait));
7c673cae FG	303	}
	304	--num_drained;
	305	}
7c673cae FG	306	}
	307
	308	cct->get_heartbeat_map()->reset_timeout(
	309	hb,
	310	wq->timeout_interval, wq->suicide_interval);
	311	wq->_process(thread_index, hb);
	312
	313	}
	314
	315	ldout(cct,10) << "sharded worker finish" << dendl;
	316
	317	cct->get_heartbeat_map()->remove_worker(hb);
	318
	319	}
	320
	321	void ShardedThreadPool::start_threads()
	322	{
11fdf7f2	323	ceph_assert(ceph_mutex_is_locked(shardedpool_lock));
7c673cae FG	324	int32_t thread_index = 0;
	325	while (threads_shardedpool.size() < num_threads) {
	326
	327	WorkThreadSharded *wt = new WorkThreadSharded(this, thread_index);
	328	ldout(cct, 10) << "start_threads creating and starting " << wt << dendl;
	329	threads_shardedpool.push_back(wt);
	330	wt->create(thread_name.c_str());
	331	thread_index++;
	332	}
	333	}
	334
	335	void ShardedThreadPool::start()
	336	{
	337	ldout(cct,10) << "start" << dendl;
	338
11fdf7f2	339	shardedpool_lock.lock();
7c673cae	340	start_threads();
11fdf7f2	341	shardedpool_lock.unlock();
7c673cae FG	342	ldout(cct,15) << "started" << dendl;
	343	}
	344
	345	void ShardedThreadPool::stop()
	346	{
	347	ldout(cct,10) << "stop" << dendl;
31f18b77	348	stop_threads = true;
11fdf7f2	349	ceph_assert(wq != NULL);
7c673cae FG	350	wq->return_waiting_threads();
	351	for (vector<WorkThreadSharded*>::iterator p = threads_shardedpool.begin();
	352	p != threads_shardedpool.end();
	353	++p) {
	354	(*p)->join();
	355	delete *p;
	356	}
	357	threads_shardedpool.clear();
	358	ldout(cct,15) << "stopped" << dendl;
	359	}
	360
	361	void ShardedThreadPool::pause()
	362	{
11fdf7f2	363	std::unique_lock ul(shardedpool_lock);
7c673cae	364	ldout(cct,10) << "pause" << dendl;
31f18b77	365	pause_threads = true;
11fdf7f2	366	ceph_assert(wq != NULL);
7c673cae FG	367	wq->return_waiting_threads();
7c673cae FG	368	while (num_threads != num_paused){
11fdf7f2	369	wait_cond.wait(ul);
7c673cae	370	}
7c673cae FG	371	ldout(cct,10) << "paused" << dendl;
	372	}
	373
	374	void ShardedThreadPool::pause_new()
	375	{
	376	ldout(cct,10) << "pause_new" << dendl;
11fdf7f2	377	shardedpool_lock.lock();
31f18b77	378	pause_threads = true;
11fdf7f2	379	ceph_assert(wq != NULL);
7c673cae	380	wq->return_waiting_threads();
11fdf7f2	381	shardedpool_lock.unlock();
7c673cae FG	382	ldout(cct,10) << "paused_new" << dendl;
	383	}
	384
	385	void ShardedThreadPool::unpause()
	386	{
	387	ldout(cct,10) << "unpause" << dendl;
11fdf7f2	388	shardedpool_lock.lock();
31f18b77	389	pause_threads = false;
11fdf7f2 TL	390	wq->stop_return_waiting_threads();
	391	shardedpool_cond.notify_all();
	392	shardedpool_lock.unlock();
7c673cae FG	393	ldout(cct,10) << "unpaused" << dendl;
	394	}
	395
	396	void ShardedThreadPool::drain()
	397	{
11fdf7f2	398	std::unique_lock ul(shardedpool_lock);
7c673cae	399	ldout(cct,10) << "drain" << dendl;
31f18b77	400	drain_threads = true;
11fdf7f2	401	ceph_assert(wq != NULL);
7c673cae FG	402	wq->return_waiting_threads();
7c673cae FG	403	while (num_threads != num_drained) {
11fdf7f2	404	wait_cond.wait(ul);
7c673cae	405	}
31f18b77	406	drain_threads = false;
11fdf7f2 TL	407	wq->stop_return_waiting_threads();
11fdf7f2 TL	408	shardedpool_cond.notify_all();
7c673cae FG	409	ldout(cct,10) << "drained" << dendl;
	410	}
	411