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//
// impl/spawn.hpp
// ~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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 ASIO_IMPL_SPAWN_HPP
#define ASIO_IMPL_SPAWN_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/associated_allocator.hpp"
#include "asio/associated_executor.hpp"
#include "asio/async_result.hpp"
#include "asio/bind_executor.hpp"
#include "asio/detail/atomic_count.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_cont_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/system_error.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Handler, typename T>
class coro_handler
{
public:
coro_handler(basic_yield_context<Handler> ctx)
: coro_(ctx.coro_.lock()),
ca_(ctx.ca_),
handler_(ctx.handler_),
ready_(0),
ec_(ctx.ec_),
value_(0)
{
}
void operator()(T value)
{
*ec_ = asio::error_code();
*value_ = ASIO_MOVE_CAST(T)(value);
if (--*ready_ == 0)
(*coro_)();
}
void operator()(asio::error_code ec, T value)
{
*ec_ = ec;
*value_ = ASIO_MOVE_CAST(T)(value);
if (--*ready_ == 0)
(*coro_)();
}
//private:
shared_ptr<typename basic_yield_context<Handler>::callee_type> coro_;
typename basic_yield_context<Handler>::caller_type& ca_;
Handler handler_;
atomic_count* ready_;
asio::error_code* ec_;
T* value_;
};
template <typename Handler>
class coro_handler<Handler, void>
{
public:
coro_handler(basic_yield_context<Handler> ctx)
: coro_(ctx.coro_.lock()),
ca_(ctx.ca_),
handler_(ctx.handler_),
ready_(0),
ec_(ctx.ec_)
{
}
void operator()()
{
*ec_ = asio::error_code();
if (--*ready_ == 0)
(*coro_)();
}
void operator()(asio::error_code ec)
{
*ec_ = ec;
if (--*ready_ == 0)
(*coro_)();
}
//private:
shared_ptr<typename basic_yield_context<Handler>::callee_type> coro_;
typename basic_yield_context<Handler>::caller_type& ca_;
Handler handler_;
atomic_count* ready_;
asio::error_code* ec_;
};
template <typename Handler, typename T>
inline void* asio_handler_allocate(std::size_t size,
coro_handler<Handler, T>* this_handler)
{
return asio_handler_alloc_helpers::allocate(
size, this_handler->handler_);
}
template <typename Handler, typename T>
inline void asio_handler_deallocate(void* pointer, std::size_t size,
coro_handler<Handler, T>* this_handler)
{
asio_handler_alloc_helpers::deallocate(
pointer, size, this_handler->handler_);
}
template <typename Handler, typename T>
inline bool asio_handler_is_continuation(coro_handler<Handler, T>*)
{
return true;
}
template <typename Function, typename Handler, typename T>
inline void asio_handler_invoke(Function& function,
coro_handler<Handler, T>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
}
template <typename Function, typename Handler, typename T>
inline void asio_handler_invoke(const Function& function,
coro_handler<Handler, T>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
}
template <typename Handler, typename T>
class coro_async_result
{
public:
typedef coro_handler<Handler, T> completion_handler_type;
typedef T return_type;
explicit coro_async_result(completion_handler_type& h)
: handler_(h),
ca_(h.ca_),
ready_(2)
{
h.ready_ = &ready_;
out_ec_ = h.ec_;
if (!out_ec_) h.ec_ = &ec_;
h.value_ = &value_;
}
return_type get()
{
// Must not hold shared_ptr to coro while suspended.
handler_.coro_.reset();
if (--ready_ != 0)
ca_();
if (!out_ec_ && ec_) throw asio::system_error(ec_);
return ASIO_MOVE_CAST(return_type)(value_);
}
private:
completion_handler_type& handler_;
typename basic_yield_context<Handler>::caller_type& ca_;
atomic_count ready_;
asio::error_code* out_ec_;
asio::error_code ec_;
return_type value_;
};
template <typename Handler>
class coro_async_result<Handler, void>
{
public:
typedef coro_handler<Handler, void> completion_handler_type;
typedef void return_type;
explicit coro_async_result(completion_handler_type& h)
: handler_(h),
ca_(h.ca_),
ready_(2)
{
h.ready_ = &ready_;
out_ec_ = h.ec_;
if (!out_ec_) h.ec_ = &ec_;
}
void get()
{
// Must not hold shared_ptr to coro while suspended.
handler_.coro_.reset();
if (--ready_ != 0)
ca_();
if (!out_ec_ && ec_) throw asio::system_error(ec_);
}
private:
completion_handler_type& handler_;
typename basic_yield_context<Handler>::caller_type& ca_;
atomic_count ready_;
asio::error_code* out_ec_;
asio::error_code ec_;
};
} // namespace detail
#if !defined(GENERATING_DOCUMENTATION)
template <typename Handler, typename ReturnType>
class async_result<basic_yield_context<Handler>, ReturnType()>
: public detail::coro_async_result<Handler, void>
{
public:
explicit async_result(
typename detail::coro_async_result<Handler,
void>::completion_handler_type& h)
: detail::coro_async_result<Handler, void>(h)
{
}
};
template <typename Handler, typename ReturnType, typename Arg1>
class async_result<basic_yield_context<Handler>, ReturnType(Arg1)>
: public detail::coro_async_result<Handler, typename decay<Arg1>::type>
{
public:
explicit async_result(
typename detail::coro_async_result<Handler,
typename decay<Arg1>::type>::completion_handler_type& h)
: detail::coro_async_result<Handler, Arg1>(h)
{
}
};
template <typename Handler, typename ReturnType>
class async_result<basic_yield_context<Handler>,
ReturnType(asio::error_code)>
: public detail::coro_async_result<Handler, void>
{
public:
explicit async_result(
typename detail::coro_async_result<Handler,
void>::completion_handler_type& h)
: detail::coro_async_result<Handler, void>(h)
{
}
};
template <typename Handler, typename ReturnType, typename Arg2>
class async_result<basic_yield_context<Handler>,
ReturnType(asio::error_code, Arg2)>
: public detail::coro_async_result<Handler, typename decay<Arg2>::type>
{
public:
explicit async_result(
typename detail::coro_async_result<Handler,
typename decay<Arg2>::type>::completion_handler_type& h)
: detail::coro_async_result<Handler, Arg2>(h)
{
}
};
#if !defined(ASIO_NO_DEPRECATED)
template <typename Handler, typename ReturnType>
struct handler_type<basic_yield_context<Handler>, ReturnType()>
{
typedef detail::coro_handler<Handler, void> type;
};
template <typename Handler, typename ReturnType, typename Arg1>
struct handler_type<basic_yield_context<Handler>, ReturnType(Arg1)>
{
typedef detail::coro_handler<Handler, typename decay<Arg1>::type> type;
};
template <typename Handler, typename ReturnType>
struct handler_type<basic_yield_context<Handler>,
ReturnType(asio::error_code)>
{
typedef detail::coro_handler<Handler, void> type;
};
template <typename Handler, typename ReturnType, typename Arg2>
struct handler_type<basic_yield_context<Handler>,
ReturnType(asio::error_code, Arg2)>
{
typedef detail::coro_handler<Handler, typename decay<Arg2>::type> type;
};
template <typename Handler, typename T>
class async_result<detail::coro_handler<Handler, T> >
: public detail::coro_async_result<Handler, T>
{
public:
typedef typename detail::coro_async_result<Handler, T>::return_type type;
explicit async_result(
typename detail::coro_async_result<Handler,
void>::completion_handler_type& h)
: detail::coro_async_result<Handler, T>(h)
{
}
};
#endif // !defined(ASIO_NO_DEPRECATED)
template <typename Handler, typename T, typename Allocator>
struct associated_allocator<detail::coro_handler<Handler, T>, Allocator>
{
typedef typename associated_allocator<Handler, Allocator>::type type;
static type get(const detail::coro_handler<Handler, T>& h,
const Allocator& a = Allocator()) ASIO_NOEXCEPT
{
return associated_allocator<Handler, Allocator>::get(h.handler_, a);
}
};
template <typename Handler, typename T, typename Executor>
struct associated_executor<detail::coro_handler<Handler, T>, Executor>
{
typedef typename associated_executor<Handler, Executor>::type type;
static type get(const detail::coro_handler<Handler, T>& h,
const Executor& ex = Executor()) ASIO_NOEXCEPT
{
return associated_executor<Handler, Executor>::get(h.handler_, ex);
}
};
namespace detail {
template <typename Handler, typename Function>
struct spawn_data : private noncopyable
{
spawn_data(ASIO_MOVE_ARG(Handler) handler,
bool call_handler, ASIO_MOVE_ARG(Function) function)
: handler_(ASIO_MOVE_CAST(Handler)(handler)),
call_handler_(call_handler),
function_(ASIO_MOVE_CAST(Function)(function))
{
}
weak_ptr<typename basic_yield_context<Handler>::callee_type> coro_;
Handler handler_;
bool call_handler_;
Function function_;
};
template <typename Handler, typename Function>
struct coro_entry_point
{
void operator()(typename basic_yield_context<Handler>::caller_type& ca)
{
shared_ptr<spawn_data<Handler, Function> > data(data_);
#if !defined(BOOST_COROUTINES_UNIDIRECT) && !defined(BOOST_COROUTINES_V2)
ca(); // Yield until coroutine pointer has been initialised.
#endif // !defined(BOOST_COROUTINES_UNIDIRECT) && !defined(BOOST_COROUTINES_V2)
const basic_yield_context<Handler> yield(
data->coro_, ca, data->handler_);
(data->function_)(yield);
if (data->call_handler_)
(data->handler_)();
}
shared_ptr<spawn_data<Handler, Function> > data_;
};
template <typename Handler, typename Function>
struct spawn_helper
{
void operator()()
{
typedef typename basic_yield_context<Handler>::callee_type callee_type;
coro_entry_point<Handler, Function> entry_point = { data_ };
shared_ptr<callee_type> coro(new callee_type(entry_point, attributes_));
data_->coro_ = coro;
(*coro)();
}
shared_ptr<spawn_data<Handler, Function> > data_;
boost::coroutines::attributes attributes_;
};
template <typename Function, typename Handler, typename Function1>
inline void asio_handler_invoke(Function& function,
spawn_helper<Handler, Function1>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, this_handler->data_->handler_);
}
template <typename Function, typename Handler, typename Function1>
inline void asio_handler_invoke(const Function& function,
spawn_helper<Handler, Function1>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, this_handler->data_->handler_);
}
inline void default_spawn_handler() {}
} // namespace detail
template <typename Function>
inline void spawn(ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes)
{
typedef typename decay<Function>::type function_type;
typename associated_executor<function_type>::type ex(
(get_associated_executor)(function));
asio::spawn(ex, ASIO_MOVE_CAST(Function)(function), attributes);
}
template <typename Handler, typename Function>
void spawn(ASIO_MOVE_ARG(Handler) handler,
ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes,
typename enable_if<!is_executor<typename decay<Handler>::type>::value &&
!is_convertible<Handler&, execution_context&>::value>::type*)
{
typedef typename decay<Handler>::type handler_type;
typename associated_executor<handler_type>::type ex(
(get_associated_executor)(handler));
typename associated_allocator<handler_type>::type a(
(get_associated_allocator)(handler));
detail::spawn_helper<handler_type, Function> helper;
helper.data_.reset(
new detail::spawn_data<handler_type, Function>(
ASIO_MOVE_CAST(Handler)(handler), true,
ASIO_MOVE_CAST(Function)(function)));
helper.attributes_ = attributes;
ex.dispatch(helper, a);
}
template <typename Handler, typename Function>
void spawn(basic_yield_context<Handler> ctx,
ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes)
{
Handler handler(ctx.handler_); // Explicit copy that might be moved from.
typename associated_executor<Handler>::type ex(
(get_associated_executor)(handler));
typename associated_allocator<Handler>::type a(
(get_associated_allocator)(handler));
detail::spawn_helper<Handler, Function> helper;
helper.data_.reset(
new detail::spawn_data<Handler, Function>(
ASIO_MOVE_CAST(Handler)(handler), false,
ASIO_MOVE_CAST(Function)(function)));
helper.attributes_ = attributes;
ex.dispatch(helper, a);
}
template <typename Function, typename Executor>
inline void spawn(const Executor& ex,
ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes,
typename enable_if<is_executor<Executor>::value>::type*)
{
asio::spawn(asio::strand<Executor>(ex),
ASIO_MOVE_CAST(Function)(function), attributes);
}
template <typename Function, typename Executor>
inline void spawn(const strand<Executor>& ex,
ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes)
{
asio::spawn(asio::bind_executor(
ex, &detail::default_spawn_handler),
ASIO_MOVE_CAST(Function)(function), attributes);
}
template <typename Function>
inline void spawn(const asio::io_context::strand& s,
ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes)
{
asio::spawn(asio::bind_executor(
s, &detail::default_spawn_handler),
ASIO_MOVE_CAST(Function)(function), attributes);
}
template <typename Function, typename ExecutionContext>
inline void spawn(ExecutionContext& ctx,
ASIO_MOVE_ARG(Function) function,
const boost::coroutines::attributes& attributes,
typename enable_if<is_convertible<
ExecutionContext&, execution_context&>::value>::type*)
{
asio::spawn(ctx.get_executor(),
ASIO_MOVE_CAST(Function)(function), attributes);
}
#endif // !defined(GENERATING_DOCUMENTATION)
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IMPL_SPAWN_HPP
|