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// Copyright Oliver Kowalke 2014.
// 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_COROUTINES2_DETAIL_PUSH_COROUTINE_IPP
#define BOOST_COROUTINES2_DETAIL_PUSH_COROUTINE_IPP
#include <memory>
#include <utility>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/context/execution_context.hpp>
#include <boost/context/stack_context.hpp>
#include <boost/coroutine2/detail/config.hpp>
#include <boost/coroutine2/fixedsize_stack.hpp>
#include <boost/coroutine2/segmented_stack.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace coroutines2 {
namespace detail {
// push_coroutine< T >
template< typename T >
push_coroutine< T >::push_coroutine( control_block * cb) :
cb_( cb) {
}
template< typename T >
template< typename Fn >
push_coroutine< T >::push_coroutine( Fn && fn, bool preserve_fpu) :
push_coroutine( default_stack(), std::forward< Fn >( fn), preserve_fpu) {
}
template< typename T >
template< typename StackAllocator, typename Fn >
push_coroutine< T >::push_coroutine( StackAllocator salloc, Fn && fn, bool preserve_fpu) :
cb_( nullptr) {
context::stack_context sctx( salloc.allocate() );
// reserve space for control structure
#if defined(BOOST_NO_CXX14_CONSTEXPR) || defined(BOOST_NO_CXX11_STD_ALIGN)
void * sp = static_cast< char * >( sctx.sp) - sizeof( control_block);
std::size_t size = sctx.size - sizeof( control_block);
#else
constexpr std::size_t func_alignment = 64; // alignof( control_block);
constexpr std::size_t func_size = sizeof( control_block);
// reserve space on stack
void * sp = static_cast< char * >( sctx.sp) - func_size - func_alignment;
// align sp pointer
std::size_t space = func_size + func_alignment;
sp = std::align( func_alignment, func_size, sp, space);
BOOST_ASSERT( nullptr != sp);
// calculate remaining size
std::size_t size = sctx.size - ( static_cast< char * >( sctx.sp) - static_cast< char * >( sp) );
#endif
// placment new for control structure on coroutine stack
cb_= new ( sp) control_block( context::preallocated( sp, size, sctx),
salloc, std::forward< Fn >( fn), preserve_fpu);
}
template< typename T >
push_coroutine< T >::~push_coroutine() {
if ( nullptr != cb_) {
cb_->~control_block();
}
}
template< typename T >
push_coroutine< T >::push_coroutine( push_coroutine && other) :
cb_( other.cb_) {
other.cb_ = nullptr;
}
template< typename T >
push_coroutine< T > &
push_coroutine< T >::operator()( T const& t) {
cb_->resume( t);
return * this;
}
template< typename T >
push_coroutine< T > &
push_coroutine< T >::operator()( T && t) {
cb_->resume( std::forward< T >( t) );
return * this;
}
template< typename T >
push_coroutine< T >::operator bool() const noexcept {
return nullptr != cb_ && cb_->valid();
}
template< typename T >
bool
push_coroutine< T >::operator!() const noexcept {
return nullptr == cb_ || ! cb_->valid();
}
// push_coroutine< T & >
template< typename T >
push_coroutine< T & >::push_coroutine( control_block * cb) :
cb_( cb) {
}
template< typename T >
template< typename Fn >
push_coroutine< T & >::push_coroutine( Fn && fn, bool preserve_fpu) :
push_coroutine( default_stack(), std::forward< Fn >( fn), preserve_fpu) {
}
template< typename T >
template< typename StackAllocator, typename Fn >
push_coroutine< T & >::push_coroutine( StackAllocator salloc, Fn && fn, bool preserve_fpu) :
cb_( nullptr) {
context::stack_context sctx( salloc.allocate() );
// reserve space for control structure
#if defined(BOOST_NO_CXX14_CONSTEXPR) || defined(BOOST_NO_CXX11_STD_ALIGN)
void * sp = static_cast< char * >( sctx.sp) - sizeof( control_block);
std::size_t size = sctx.size - sizeof( control_block);
#else
constexpr std::size_t func_alignment = 64; // alignof( control_block);
constexpr std::size_t func_size = sizeof( control_block);
// reserve space on stack
void * sp = static_cast< char * >( sctx.sp) - func_size - func_alignment;
// align sp pointer
std::size_t space = func_size + func_alignment;
sp = std::align( func_alignment, func_size, sp, space);
BOOST_ASSERT( nullptr != sp);
// calculate remaining size
std::size_t size = sctx.size - ( static_cast< char * >( sctx.sp) - static_cast< char * >( sp) );
#endif
// placment new for control structure on coroutine stack
cb_ = new ( sp) control_block( context::preallocated( sp, size, sctx),
salloc, std::forward< Fn >( fn), preserve_fpu);
}
template< typename T >
push_coroutine< T & >::~push_coroutine() {
if ( nullptr != cb_) {
cb_->~control_block();
}
}
template< typename T >
push_coroutine< T & >::push_coroutine( push_coroutine && other) :
cb_( other.cb_) {
other.cb_ = nullptr;
}
template< typename T >
push_coroutine< T & > &
push_coroutine< T & >::operator()( T & t) {
cb_->resume( t);
return * this;
}
template< typename T >
push_coroutine< T & >::operator bool() const noexcept {
return nullptr != cb_ && cb_->valid();
}
template< typename T >
bool
push_coroutine< T & >::operator!() const noexcept {
return nullptr == cb_ || ! cb_->valid();
}
// push_coroutine< void >
inline
push_coroutine< void >::push_coroutine( control_block * cb) :
cb_( cb) {
}
template< typename Fn >
push_coroutine< void >::push_coroutine( Fn && fn, bool preserve_fpu) :
push_coroutine( default_stack(), std::forward< Fn >( fn), preserve_fpu) {
}
template< typename StackAllocator, typename Fn >
push_coroutine< void >::push_coroutine( StackAllocator salloc, Fn && fn, bool preserve_fpu) :
cb_( nullptr) {
context::stack_context sctx( salloc.allocate() );
// reserve space for control structure
#if defined(BOOST_NO_CXX14_CONSTEXPR) || defined(BOOST_NO_CXX11_STD_ALIGN)
void * sp = static_cast< char * >( sctx.sp) - sizeof( control_block);
std::size_t size = sctx.size - sizeof( control_block);
#else
constexpr std::size_t func_alignment = 64; // alignof( control_block);
constexpr std::size_t func_size = sizeof( control_block);
// reserve space on stack
void * sp = static_cast< char * >( sctx.sp) - func_size - func_alignment;
// align sp pointer
std::size_t space = func_size + func_alignment;
sp = std::align( func_alignment, func_size, sp, space);
BOOST_ASSERT( nullptr != sp);
// calculate remaining size
std::size_t size = sctx.size - ( static_cast< char * >( sctx.sp) - static_cast< char * >( sp) );
#endif
// placment new for control structure on coroutine stack
cb_ = new ( sp) control_block( context::preallocated( sp, size, sctx),
salloc, std::forward< Fn >( fn), preserve_fpu);
}
inline
push_coroutine< void >::~push_coroutine() {
if ( nullptr != cb_) {
cb_->~control_block();
}
}
inline
push_coroutine< void >::push_coroutine( push_coroutine && other) :
cb_( other.cb_) {
other.cb_ = nullptr;
}
inline
push_coroutine< void > &
push_coroutine< void >::operator()() {
cb_->resume();
return * this;
}
inline
push_coroutine< void >::operator bool() const noexcept {
return nullptr != cb_ && cb_->valid();
}
inline
bool
push_coroutine< void >::operator!() const noexcept {
return nullptr == cb_ || ! cb_->valid();
}
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_COROUTINES2_DETAIL_PUSH_COROUTINE_IPP
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