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Copy paththread_pool_scheduler.cpp
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304 lines (264 loc) · 10.8 KB
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/******************************************************************************\
* ___ __ *
* /\_ \ __/\ \ *
* \//\ \ /\_\ \ \____ ___ _____ _____ __ *
* \ \ \ \/\ \ \ '__`\ /'___\/\ '__`\/\ '__`\ /'__`\ *
* \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_ *
* /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\ *
* \/____/ \/_/\/___/ \/____/ \ \ \/ \ \ \/ \/__/\/_/ *
* \ \_\ \ \_\ *
* \/_/ \/_/ *
* *
* Copyright (C) 2011-2013 *
* Dominik Charousset <dominik.charousset@haw-hamburg.de> *
* *
* This file is part of libcppa. *
* libcppa is free software: you can redistribute it and/or modify it under *
* the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation, either version 3 of the License *
* or (at your option) any later version. *
* *
* libcppa is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with libcppa. If not, see <http://www.gnu.org/licenses/>. *
\******************************************************************************/
#include <mutex>
#include <thread>
#include <cstdint>
#include <cstddef>
#include <iostream>
#include "cppa/event_based_actor.hpp"
#include "cppa/thread_mapped_actor.hpp"
#include "cppa/detail/actor_count.hpp"
#include "cppa/context_switching_actor.hpp"
#include "cppa/detail/thread_pool_scheduler.hpp"
using std::cout;
using std::endl;
namespace cppa { namespace detail {
namespace {
typedef std::unique_lock<std::mutex> guard_type;
typedef intrusive::single_reader_queue<thread_pool_scheduler::worker> worker_queue;
} // namespace <anonmyous>
struct thread_pool_scheduler::worker {
typedef scheduled_actor* job_ptr;
job_queue* m_job_queue;
job_ptr m_dummy;
std::thread m_thread;
worker(job_queue* jq, job_ptr dummy) : m_job_queue(jq), m_dummy(dummy) { }
void start() {
m_thread = std::thread(&thread_pool_scheduler::worker_loop, this);
}
worker(const worker&) = delete;
worker& operator=(const worker&) = delete;
job_ptr aggressive_polling() {
job_ptr result = nullptr;
for (int i = 0; i < 100; ++i) {
result = m_job_queue->try_pop();
if (result) {
return result;
}
std::this_thread::yield();
}
return result;
}
job_ptr less_aggressive_polling() {
job_ptr result = nullptr;
for (int i = 0; i < 550; ++i) {
result = m_job_queue->try_pop();
if (result) {
return result;
}
//std::this_thread::sleep_for(std::chrono::milliseconds(1));
std::this_thread::sleep_for(std::chrono::microseconds(50));
}
return result;
}
job_ptr relaxed_polling() {
job_ptr result = nullptr;
for (;;) {
result = m_job_queue->try_pop();
if (result) {
return result;
}
std::this_thread::sleep_for(std::chrono::milliseconds(10));
}
}
void operator()() {
util::fiber fself;
job_ptr job = nullptr;
actor_ptr next_job;
for (;;) {
job = aggressive_polling();
if (job == nullptr) {
job = less_aggressive_polling();
if (job == nullptr) {
job = relaxed_polling();
}
}
if (job == m_dummy) {
// dummy of doom received ...
m_job_queue->push_back(job); // kill the next guy
return; // and say goodbye
}
else {
do {
next_job.reset();
if (job->resume(&fself, next_job) == resume_result::actor_done) {
bool hidden = job->is_hidden();
job->deref();
//std::atomic_thread_fence(std::memory_order_seq_cst);
if (!hidden) dec_actor_count();
}
if (next_job) {
job = static_cast<job_ptr>(next_job.get());
//get_scheduler()->printer()->enqueue(job, make_any_tuple("fast-forwarded execution (chained actor)\n"));
}
else job = nullptr;
}
while (job); // loops until next_job was nullptr
}
}
}
};
void thread_pool_scheduler::worker_loop(thread_pool_scheduler::worker* w) {
(*w)();
}
thread_pool_scheduler::thread_pool_scheduler() {
m_num_threads = std::max<size_t>(std::thread::hardware_concurrency() * 2, 4);
}
thread_pool_scheduler::thread_pool_scheduler(size_t num_worker_threads) {
m_num_threads = num_worker_threads;
}
void thread_pool_scheduler::supervisor_loop(job_queue* jqueue,
scheduled_actor* dummy,
size_t num_threads) {
std::vector<std::unique_ptr<thread_pool_scheduler::worker> > workers;
for (size_t i = 0; i < num_threads; ++i) {
workers.emplace_back(new worker(jqueue, dummy));
workers.back()->start();
}
// wait for workers
for (auto& w : workers) {
w->m_thread.join();
}
}
void thread_pool_scheduler::initialize() {
m_supervisor = std::thread(&thread_pool_scheduler::supervisor_loop,
&m_queue, &m_dummy, m_num_threads);
super::initialize();
}
void thread_pool_scheduler::destroy() {
m_queue.push_back(&m_dummy);
m_supervisor.join();
// make sure job queue is empty, because destructor of m_queue would
// otherwise delete elements it shouldn't
auto ptr = m_queue.try_pop();
while (ptr != nullptr) {
if (ptr != &m_dummy) {
bool hidden = ptr->is_hidden();
ptr->deref();
std::atomic_thread_fence(std::memory_order_seq_cst);
if (!hidden) dec_actor_count();
}
ptr = m_queue.try_pop();
}
super::destroy();
}
void thread_pool_scheduler::enqueue(scheduled_actor* what) {
m_queue.push_back(what);
}
actor_ptr thread_pool_scheduler::spawn_as_thread(void_function fun,
init_callback cb,
bool hidden) {
if (!hidden) inc_actor_count();
thread_mapped_actor_ptr ptr{detail::memory::create<thread_mapped_actor>(std::move(fun))};
ptr->init();
ptr->initialized(true);
cb(ptr.get());
std::thread([hidden, ptr]() {
scoped_self_setter sss{ptr.get()};
try {
ptr->run();
ptr->on_exit();
}
catch (...) { }
std::atomic_thread_fence(std::memory_order_seq_cst);
if (!hidden) dec_actor_count();
}).detach();
return ptr;
}
actor_ptr thread_pool_scheduler::spawn_impl(scheduled_actor_ptr what) {
if (what->has_behavior()) {
if (!what->is_hidden()) { inc_actor_count(); }
what->ref();
// event-based actors are not pushed to the job queue on startup
if (what->impl_type() == context_switching_impl) {
m_queue.push_back(what.get());
}
}
else {
what->on_exit();
}
return std::move(what);
}
actor_ptr thread_pool_scheduler::spawn(scheduled_actor* raw,
scheduling_hint hint) {
scheduled_actor_ptr ptr{raw};
ptr->attach_to_scheduler(this, hint == scheduled_and_hidden);
return spawn_impl(std::move(ptr));
}
actor_ptr thread_pool_scheduler::spawn(scheduled_actor* raw,
init_callback cb,
scheduling_hint hint) {
scheduled_actor_ptr ptr{raw};
ptr->attach_to_scheduler(this, hint == scheduled_and_hidden);
cb(ptr.get());
return spawn_impl(std::move(ptr));
}
#ifndef CPPA_DISABLE_CONTEXT_SWITCHING
actor_ptr thread_pool_scheduler::spawn(void_function fun, scheduling_hint hint) {
if (hint == scheduled || hint == scheduled_and_hidden) {
scheduled_actor_ptr ptr{detail::memory::create<context_switching_actor>(std::move(fun))};
ptr->attach_to_scheduler(this, hint == scheduled_and_hidden);
return spawn_impl(std::move(ptr));
}
else {
return spawn_as_thread(std::move(fun),
[](local_actor*) { },
hint == detached_and_hidden);
}
}
actor_ptr thread_pool_scheduler::spawn(void_function fun,
init_callback init_cb,
scheduling_hint hint) {
if (hint == scheduled || hint == scheduled_and_hidden) {
scheduled_actor_ptr ptr{detail::memory::create<context_switching_actor>(std::move(fun))};
ptr->attach_to_scheduler(this, hint == scheduled_and_hidden);
init_cb(ptr.get());
return spawn_impl(std::move(ptr));
}
else {
return spawn_as_thread(std::move(fun),
std::move(init_cb),
hint == detached_and_hidden);
}
}
#else // CPPA_DISABLE_CONTEXT_SWITCHING
actor_ptr thread_pool_scheduler::spawn(void_function what, scheduling_hint sh) {
return spawn_as_thread(std::move(what),
[](local_actor*) { },
sh == detached_and_hidden);
}
actor_ptr thread_pool_scheduler::spawn(void_function what,
init_callback init_cb,
scheduling_hint sh) {
return spawn_as_thread(std::move(what),
std::move(init_cb),
sh == detached_and_hidden);
}
#endif
} } // namespace cppa::detail
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