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Diffstat (limited to 'boost/coroutine2/detail/pull_control_block_ecv1.ipp')
| -rw-r--r-- | boost/coroutine2/detail/pull_control_block_ecv1.ipp | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/boost/coroutine2/detail/pull_control_block_ecv1.ipp b/boost/coroutine2/detail/pull_control_block_ecv1.ipp new file mode 100644 index 0000000000..f271e795df --- /dev/null +++ b/boost/coroutine2/detail/pull_control_block_ecv1.ipp @@ -0,0 +1,421 @@ + +// 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_PULL_CONTROL_BLOCK_IPP +#define BOOST_COROUTINES2_DETAIL_PULL_CONTROL_BLOCK_IPP + +#include <exception> +#include <functional> +#include <memory> + +#include <boost/assert.hpp> +#include <boost/config.hpp> + +#include <boost/context/execution_context.hpp> + +#include <boost/coroutine2/detail/config.hpp> +#include <boost/coroutine2/detail/decay_copy.hpp> +#include <boost/coroutine2/detail/forced_unwind.hpp> +#include <boost/coroutine2/detail/state.hpp> + +#ifdef BOOST_HAS_ABI_HEADERS +# include BOOST_ABI_PREFIX +#endif + +namespace boost { +namespace coroutines2 { +namespace detail { + +// pull_coroutine< T > + +template< typename T > +void +pull_coroutine< T >::control_block::destroy( control_block * cb) noexcept { + boost::context::execution_context ctx = cb->ctx; + // destroy control structure + cb->~control_block(); +} + +template< typename T > +template< typename StackAllocator, typename Fn > +pull_coroutine< T >::control_block::control_block( context::preallocated palloc, StackAllocator salloc, + Fn && fn) : +#if defined(BOOST_NO_CXX14_GENERIC_LAMBDAS) + ctx{ std::allocator_arg, palloc, salloc, + std::move( + std::bind( + [this]( typename std::decay< Fn >::type & fn_, boost::context::execution_context & ctx, void *) mutable noexcept { + // create synthesized push_coroutine< T > + typename push_coroutine< T >::control_block synthesized_cb{ this, ctx }; + push_coroutine< T > synthesized{ & synthesized_cb }; + other = & synthesized_cb; + try { + auto fn = std::move( fn_); + // call coroutine-fn with synthesized push_coroutine as argument + fn( synthesized); + } catch ( forced_unwind const&) { + // do nothing for unwinding exception + } catch (...) { + // store other exceptions in exception-pointer + except = std::current_exception(); + } + // set termination flags + state |= state_t::complete; + // jump back to ctx + other->ctx(); + BOOST_ASSERT_MSG( false, "pull_coroutine is complete"); + }, + std::forward< Fn >( fn), + boost::context::execution_context::current(), + std::placeholders::_1))}, +#else + ctx{ std::allocator_arg, palloc, salloc, + [this,fn_=decay_copy( std::forward< Fn >( fn) ),ctx=boost::context::execution_context::current()] (void *) mutable noexcept { + // create synthesized push_coroutine< T > + typename push_coroutine< T >::control_block synthesized_cb{ this, ctx }; + push_coroutine< T > synthesized{ & synthesized_cb }; + other = & synthesized_cb; + try { + auto fn = std::move( fn_); + // call coroutine-fn with synthesized push_coroutine as argument + fn( synthesized); + } catch ( forced_unwind const&) { + // do nothing for unwinding exception + } catch (...) { + // store other exceptions in exception-pointer + except = std::current_exception(); + } + // set termination flags + state |= state_t::complete; + // jump back to ctx + other->ctx(); + BOOST_ASSERT_MSG( false, "pull_coroutine is complete"); + }}, +#endif + other{ nullptr }, + state{ state_t::unwind }, + except{}, + bvalid{ false }, + storage{} { + // enter coroutine-fn in order to have first value available after ctor (of `*this`) returns + set( static_cast< T * >( ctx() ) ); +} + +template< typename T > +pull_coroutine< T >::control_block::control_block( typename push_coroutine< T >::control_block * cb, + boost::context::execution_context const& ctx_) noexcept : + ctx{ ctx_ }, + other{ cb }, + state{ state_t::none }, + except{}, + bvalid{ false }, + storage{} { +} + +template< typename T > +pull_coroutine< T >::control_block::~control_block() { + if ( state_t::none == ( state & state_t::complete) && + state_t::none != ( state & state_t::unwind) ) { + // unwind coroutine stack + ctx( context::exec_ontop_arg, unwind_coroutine); + } + // destroy data if it set + if ( bvalid) { + reinterpret_cast< T * >( std::addressof( storage) )->~T(); + } +} + +template< typename T > +void +pull_coroutine< T >::control_block::deallocate() noexcept { + if ( state_t::none != ( state & state_t::unwind) ) { + destroy( this); + } +} + +template< typename T > +void +pull_coroutine< T >::control_block::resume() { + other->ctx = boost::context::execution_context::current(); + set( static_cast< T * >( ctx() ) ); + if ( except) { + std::rethrow_exception( except); + } +} + +template< typename T > +void +pull_coroutine< T >::control_block::set( T * t) { + // destroy data if it set + if ( bvalid) { + reinterpret_cast< T * >( std::addressof( storage) )->~T(); + } + if ( nullptr != t) { + ::new ( static_cast< void * >( std::addressof( storage) ) ) T( std::move( * t) ); + bvalid = true; + } else { + bvalid = false; + } +} + +template< typename T > +T & +pull_coroutine< T >::control_block::get() noexcept { + return * reinterpret_cast< T * >( std::addressof( storage) ); +} + +template< typename T > +bool +pull_coroutine< T >::control_block::valid() const noexcept { + return nullptr != other && state_t::none == ( state & state_t::complete) && bvalid; +} + + +// pull_coroutine< T & > + +template< typename T > +void +pull_coroutine< T & >::control_block::destroy( control_block * cb) noexcept { + boost::context::execution_context ctx = cb->ctx; + // destroy control structure + cb->~control_block(); +} + +template< typename T > +template< typename StackAllocator, typename Fn > +pull_coroutine< T & >::control_block::control_block( context::preallocated palloc, StackAllocator salloc, + Fn && fn) : +#if defined(BOOST_NO_CXX14_GENERIC_LAMBDAS) + ctx{ std::allocator_arg, palloc, salloc, + std::move( + std::bind( + [this]( typename std::decay< Fn >::type & fn_, boost::context::execution_context & ctx, void *) mutable noexcept { + // create synthesized push_coroutine< T > + typename push_coroutine< T & >::control_block synthesized_cb{ this, ctx }; + push_coroutine< T & > synthesized{ & synthesized_cb }; + other = & synthesized_cb; + try { + auto fn = std::move( fn_); + // call coroutine-fn with synthesized push_coroutine as argument + fn( synthesized); + } catch ( forced_unwind const&) { + // do nothing for unwinding exception + } catch (...) { + // store other exceptions in exception-pointer + except = std::current_exception(); + } + // set termination flags + state |= state_t::complete; + // jump back to ctx + other->ctx(); + BOOST_ASSERT_MSG( false, "pull_coroutine is complete"); + }, + std::forward< Fn >( fn), + boost::context::execution_context::current(), + std::placeholders::_1))}, +#else + ctx{ std::allocator_arg, palloc, salloc, + [this,fn_=decay_copy( std::forward< Fn >( fn) ),ctx=boost::context::execution_context::current()] (void *) mutable noexcept { + // create synthesized push_coroutine< T > + typename push_coroutine< T & >::control_block synthesized_cb{ this, ctx }; + push_coroutine< T & > synthesized{ & synthesized_cb }; + other = & synthesized_cb; + try { + auto fn = std::move( fn_); + // call coroutine-fn with synthesized push_coroutine as argument + fn( synthesized); + } catch ( forced_unwind const&) { + // do nothing for unwinding exception + } catch (...) { + // store other exceptions in exception-pointer + except = std::current_exception(); + } + // set termination flags + state |= state_t::complete; + // jump back to ctx + other->ctx(); + BOOST_ASSERT_MSG( false, "pull_coroutine is complete"); + }}, +#endif + other{ nullptr }, + state{ state_t::unwind }, + except{}, + t{ nullptr } { + // enter coroutine-fn in order to have first value available after ctor (of `*this`) returns + t = static_cast< T * >( ctx() ); +} + +template< typename T > +pull_coroutine< T & >::control_block::control_block( typename push_coroutine< T & >::control_block * cb, + boost::context::execution_context const& ctx_) noexcept : + ctx{ ctx_ }, + other{ cb }, + state{ state_t::none }, + except{}, + t( nullptr) { +} + +template< typename T > +pull_coroutine< T & >::control_block::~control_block() { + if ( state_t::none == ( state & state_t::complete) && + state_t::none != ( state & state_t::unwind) ) { + // unwind coroutine stack + ctx( context::exec_ontop_arg, unwind_coroutine); + } +} + +template< typename T > +void +pull_coroutine< T & >::control_block::deallocate() noexcept { + if ( state_t::none != ( state & state_t::unwind) ) { + destroy( this); + } +} + +template< typename T > +void +pull_coroutine< T & >::control_block::resume() { + other->ctx = boost::context::execution_context::current(); + t = static_cast< T * >( ctx() ); + if ( except) { + std::rethrow_exception( except); + } +} + +template< typename T > +T & +pull_coroutine< T & >::control_block::get() noexcept { + return * static_cast< T * >( t); +} + +template< typename T > +bool +pull_coroutine< T & >::control_block::valid() const noexcept { + return nullptr != other && state_t::none == ( state & state_t::complete) && nullptr != t; +} + + +// pull_coroutine< void > + +inline +void +pull_coroutine< void >::control_block::destroy( control_block * cb) noexcept { + boost::context::execution_context ctx = cb->ctx; + // destroy control structure + cb->~control_block(); +} + +template< typename StackAllocator, typename Fn > +pull_coroutine< void >::control_block::control_block( context::preallocated palloc, StackAllocator salloc, + Fn && fn) : +#if defined(BOOST_NO_CXX14_GENERIC_LAMBDAS) + ctx{ std::allocator_arg, palloc, salloc, + std::move( + std::bind( + [this]( typename std::decay< Fn >::type & fn_, boost::context::execution_context & ctx, void *) mutable noexcept { + // create synthesized push_coroutine< T > + typename push_coroutine< void >::control_block synthesized_cb{ this, ctx }; + push_coroutine< void > synthesized{ & synthesized_cb }; + other = & synthesized_cb; + try { + auto fn = std::move( fn_); + // call coroutine-fn with synthesized push_coroutine as argument + fn( synthesized); + } catch ( forced_unwind const&) { + // do nothing for unwinding exception + } catch (...) { + // store other exceptions in exception-pointer + except = std::current_exception(); + } + // set termination flags + state |= state_t::complete; + // jump back to ctx + other->ctx(); + BOOST_ASSERT_MSG( false, "pull_coroutine is complete"); + }, + std::forward< Fn >( fn), + boost::context::execution_context::current(), + std::placeholders::_1))}, +#else + ctx{ std::allocator_arg, palloc, salloc, + [this,fn_=decay_copy( std::forward< Fn >( fn) ),ctx=boost::context::execution_context::current()] (void *) mutable noexcept { + // create synthesized push_coroutine< T > + typename push_coroutine< void >::control_block synthesized_cb{ this, ctx }; + push_coroutine< void > synthesized{ & synthesized_cb }; + other = & synthesized_cb; + try { + auto fn = std::move( fn_); + // call coroutine-fn with synthesized push_coroutine as argument + fn( synthesized); + } catch ( forced_unwind const&) { + // do nothing for unwinding exception + } catch (...) { + // store other exceptions in exception-pointer + except = std::current_exception(); + } + // set termination flags + state |= state_t::complete; + // jump back to ctx + other->ctx(); + BOOST_ASSERT_MSG( false, "pull_coroutine is complete"); + }}, +#endif + other{ nullptr }, + state{ state_t::unwind }, + except{} { + // enter coroutine-fn in order to have first value available after ctor returns + ctx(); +} + +inline +pull_coroutine< void >::control_block::control_block( push_coroutine< void >::control_block * cb, + boost::context::execution_context const& ctx_) noexcept : + ctx{ ctx_ }, + other{ cb }, + state{ state_t::none }, + except{} { +} + +inline +pull_coroutine< void >::control_block::~control_block() { + if ( state_t::none == ( state & state_t::complete) && + state_t::none != ( state & state_t::unwind) ) { + // unwind coroutine stack + ctx( context::exec_ontop_arg, unwind_coroutine); + } +} + +inline +void +pull_coroutine< void >::control_block::deallocate() noexcept { + if ( state_t::none != ( state & state_t::unwind) ) { + destroy( this); + } +} + +inline +void +pull_coroutine< void >::control_block::resume() { + other->ctx = boost::context::execution_context::current(); + ctx(); + if ( except) { + std::rethrow_exception( except); + } +} + +inline +bool +pull_coroutine< void >::control_block::valid() const noexcept { + return nullptr != other && state_t::none == ( state & state_t::complete); +} + +}}} + +#ifdef BOOST_HAS_ABI_HEADERS +# include BOOST_ABI_SUFFIX +#endif + +#endif // BOOST_COROUTINES2_DETAIL_PULL_CONTROL_BLOCK_IPP |