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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)
//
#ifndef BOOST_THREAD_EXECUTORS_GENERIC_EXECUTOR_REF_HPP
#define BOOST_THREAD_EXECUTORS_GENERIC_EXECUTOR_REF_HPP
#include <boost/thread/detail/config.hpp>
#include <boost/thread/detail/delete.hpp>
#include <boost/thread/detail/move.hpp>
#include <boost/thread/executors/executor.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/config/abi_prefix.hpp>
namespace boost
{
namespace executors
{
template <class Executor>
class executor_ref : public executor
{
Executor& ex;
public:
/// type-erasure to store the works to do
typedef executors::work work;
/// executor is not copyable.
BOOST_THREAD_NO_COPYABLE(executor_ref)
executor_ref(Executor& ex_) : ex(ex_) {}
/**
* \par Effects
* Destroys the executor.
*
* \par Synchronization
* The completion of all the closures happen before the completion of the executor destructor.
*/
~executor_ref() {};
/**
* \par Effects
* Close the \c executor for submissions.
* The worker threads will work until there is no more closures to run.
*/
void close() { ex.close(); }
/**
* \par Returns
* Whether the pool is closed for submissions.
*/
bool closed() { return ex.closed(); }
/**
* \par Effects
* The specified closure will be scheduled for execution at some point in the future.
* If invoked closure throws an exception the executor will call std::terminate, as is the case with threads.
*
* \par Synchronization
* Ccompletion of closure on a particular thread happens before destruction of thread's thread local variables.
*
* \par Throws
* \c sync_queue_is_closed if the thread pool is closed.
* Whatever exception that can be throw while storing the closure.
*/
void submit(BOOST_THREAD_RV_REF(work) closure) {
ex.submit(boost::move(closure));
}
// void submit(work& closure) {
// ex.submit(closure);
// }
/**
* \par Effects
* Try to execute one task.
*
* \par Returns
* Whether a task has been executed.
*
* \par Throws
* Whatever the current task constructor throws or the task() throws.
*/
bool try_executing_one() { return ex.try_executing_one(); }
};
class generic_executor_ref
{
shared_ptr<executor> ex;
public:
/// type-erasure to store the works to do
typedef executors::work work;
template<typename Executor>
generic_executor_ref(Executor& ex_)
//: ex(make_shared<executor_ref<Executor> >(ex_)) // todo check why this doesn't works with C++03
: ex( new executor_ref<Executor>(ex_) )
{
}
//generic_executor_ref(generic_executor_ref const& other) noexcept {}
//generic_executor_ref& operator=(generic_executor_ref const& other) noexcept {}
/**
* \par Effects
* Close the \c executor for submissions.
* The worker threads will work until there is no more closures to run.
*/
void close() { ex->close(); }
/**
* \par Returns
* Whether the pool is closed for submissions.
*/
bool closed() { return ex->closed(); }
/**
* \par Requires
* \c Closure is a model of Callable(void()) and a model of CopyConstructible/MoveConstructible.
*
* \par Effects
* The specified closure will be scheduled for execution at some point in the future.
* If invoked closure throws an exception the thread pool will call std::terminate, as is the case with threads.
*
* \par Synchronization
* Completion of closure on a particular thread happens before destruction of thread's thread local variables.
*
* \par Throws
* \c sync_queue_is_closed if the thread pool is closed.
* Whatever exception that can be throw while storing the closure.
*/
void submit(BOOST_THREAD_RV_REF(work) closure)
{
ex->submit(boost::move(closure));
}
#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template <typename Closure>
void submit(Closure & closure)
{
//work w ((closure));
//submit(boost::move(w));
submit(work(closure));
}
#endif
void submit(void (*closure)())
{
work w ((closure));
submit(boost::move(w));
//submit(work(closure));
}
template <typename Closure>
void submit(BOOST_THREAD_FWD_REF(Closure) closure)
{
work w((boost::forward<Closure>(closure)));
submit(boost::move(w));
}
// size_t num_pending_closures() const
// {
// return ex->num_pending_closures();
// }
/**
* \par Effects
* Try to execute one task.
*
* \par Returns
* Whether a task has been executed.
*
* \par Throws
* Whatever the current task constructor throws or the task() throws.
*/
bool try_executing_one() { return ex->try_executing_one(); }
/**
* \par Requires
* This must be called from an scheduled task.
*
* \par Effects
* reschedule functions until pred()
*/
template <typename Pred>
bool reschedule_until(Pred const& pred)
{
do {
//schedule_one_or_yield();
if ( ! try_executing_one())
{
return false;
}
} while (! pred());
return true;
}
};
}
using executors::executor_ref;
using executors::generic_executor_ref;
}
#include <boost/config/abi_suffix.hpp>
#endif
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