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// Copyright (C) 2014 Vicente J. Botet Escriba
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// 2014/01 Vicente J. Botet Escriba
// first implementation of a thread_executor.
#ifndef BOOST_THREAD_THREAD_EXECUTOR_HPP
#define BOOST_THREAD_THREAD_EXECUTOR_HPP
#include <boost/thread/detail/config.hpp>
#include <boost/thread/detail/delete.hpp>
#include <boost/thread/detail/move.hpp>
#include <boost/thread/executors/work.hpp>
#include <boost/thread/executors/executor.hpp>
#include <boost/thread/thread_only.hpp>
#include <boost/thread/scoped_thread.hpp>
#include <boost/thread/csbl/vector.hpp>
#include <boost/config/abi_prefix.hpp>
namespace boost
{
namespace executors
{
class thread_executor
{
public:
/// type-erasure to store the works to do
typedef executors::work work;
bool closed_;
typedef scoped_thread<> thread_t;
typedef csbl::vector<thread_t> threads_type;
threads_type threads_;
mutable mutex mtx_;
/**
* Effects: try to execute one task.
* Returns: whether a task has been executed.
* Throws: whatever the current task constructor throws or the task() throws.
*/
bool try_executing_one()
{
return false;
}
public:
/// thread_executor is not copyable.
BOOST_THREAD_NO_COPYABLE(thread_executor)
/**
* \b Effects: creates a inline executor that runs closures immediately.
*
* \b Throws: Nothing.
*/
thread_executor()
: closed_(false)
{
}
/**
* \b Effects: Waits for closures (if any) to complete, then joins and destroys the threads.
*
* \b Synchronization: The completion of all the closures happen before the completion of the \c thread_executor destructor.
*/
~thread_executor()
{
// signal to all the worker thread that there will be no more submissions.
close();
// all the scoped threads will join before destroying
}
/**
* \b Effects: close the \c thread_executor for submissions.
* The loop will work until there is no more closures to run.
*/
void close()
{
lock_guard<mutex> lk(mtx_);
closed_ = true;
}
/**
* \b Returns: whether the pool is closed for submissions.
*/
bool closed(lock_guard<mutex>& )
{
return closed_;
}
bool closed()
{
lock_guard<mutex> lk(mtx_);
return closed(lk);
}
/**
* \b Requires: \c Closure is a model of \c Callable(void()) and a model of \c CopyConstructible/MoveConstructible.
*
* \b Effects: The specified \c closure will be scheduled for execution at some point in the future.
* If invoked closure throws an exception the \c thread_executor will call \c std::terminate, as is the case with threads.
*
* \b Synchronization: completion of \c closure on a particular thread happens before destruction of thread's thread local variables.
*
* \b Throws: \c sync_queue_is_closed if the thread pool is closed.
* Whatever exception that can be throw while storing the closure.
*/
#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template <typename Closure>
void submit(Closure & closure)
{
lock_guard<mutex> lk(mtx_);
if (closed(lk)) BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
threads_.reserve(threads_.size() + 1);
thread th(closure);
threads_.push_back(thread_t(boost::move(th)));
}
#endif
void submit(void (*closure)())
{
lock_guard<mutex> lk(mtx_);
if (closed(lk)) BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
threads_.reserve(threads_.size() + 1);
thread th(closure);
threads_.push_back(thread_t(boost::move(th)));
}
template <typename Closure>
void submit(BOOST_THREAD_FWD_REF(Closure) closure)
{
lock_guard<mutex> lk(mtx_);
if (closed(lk)) BOOST_THROW_EXCEPTION( sync_queue_is_closed() );
threads_.reserve(threads_.size() + 1);
thread th(boost::forward<Closure>(closure));
threads_.push_back(thread_t(boost::move(th)));
}
/**
* \b Requires: This must be called from an scheduled task.
*
* \b Effects: reschedule functions until pred()
*/
template <typename Pred>
bool reschedule_until(Pred const&)
{
return false;
}
};
}
using executors::thread_executor;
}
#include <boost/config/abi_suffix.hpp>
#endif
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