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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_CONTROL_BLOCK_IPP
#define BOOST_COROUTINES2_DETAIL_PUSH_CONTROL_BLOCK_IPP
#include <algorithm>
#include <exception>
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/context/execution_context.hpp>
#include <boost/coroutine2/detail/config.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 {
// push_coroutine< T >
template< typename T >
template< typename StackAllocator, typename Fn >
push_coroutine< T >::control_block::control_block( context::preallocated palloc, StackAllocator salloc,
Fn && fn_, bool preserve_fpu_) :
other( nullptr),
caller( boost::context::execution_context::current() ),
callee( palloc, salloc,
[=,fn=std::forward< Fn >( fn_)] () mutable -> decltype( auto) {
// create synthesized pull_coroutine< T >
typename pull_coroutine< T >::control_block synthesized_cb( this);
pull_coroutine< T > synthesized( & synthesized_cb);
other = & synthesized_cb;
try {
// call coroutine-fn with synthesized pull_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 |= static_cast< int >( state_t::complete);
caller( preserve_fpu);
BOOST_ASSERT_MSG( false, "push_coroutine is complete");
}),
preserve_fpu( preserve_fpu_),
state( static_cast< int >( state_t::unwind) ),
except(),
t( nullptr) {
}
template< typename T >
push_coroutine< T >::control_block::control_block( typename pull_coroutine< T >::control_block * cb) :
other( cb),
caller( other->callee),
callee( other->caller),
preserve_fpu( other->preserve_fpu),
state( 0),
except(),
t( nullptr) {
}
template< typename T >
push_coroutine< T >::control_block::~control_block() {
if ( 0 == ( state & static_cast< int >( state_t::complete ) ) &&
0 != ( state & static_cast< int >( state_t::unwind) ) ) {
// set early-exit flag
state |= static_cast< int >( state_t::early_exit);
callee( preserve_fpu);
}
}
template< typename T >
void
push_coroutine< T >::control_block::resume( T const& t_) {
// store data on this stack
// pass an pointer (address of tmp) to other context
T tmp( t_);
t = & tmp;
callee( preserve_fpu);
t = nullptr;
if ( except) {
std::rethrow_exception( except);
}
// test early-exit-flag
if ( 0 != ( ( other->state) & static_cast< int >( state_t::early_exit) ) ) {
throw forced_unwind();
}
}
template< typename T >
void
push_coroutine< T >::control_block::resume( T && t_) {
// store data on this stack
// pass an pointer (address of tmp) to other context
T tmp( std::move( t_) );
t = & tmp;
callee( preserve_fpu);
t = nullptr;
if ( except) {
std::rethrow_exception( except);
}
// test early-exit-flag
if ( 0 != ( ( other->state) & static_cast< int >( state_t::early_exit) ) ) {
throw forced_unwind();
}
}
template< typename T >
bool
push_coroutine< T >::control_block::valid() const noexcept {
return 0 == ( state & static_cast< int >( state_t::complete) );
}
// push_coroutine< T & >
template< typename T >
template< typename StackAllocator, typename Fn >
push_coroutine< T & >::control_block::control_block( context::preallocated palloc, StackAllocator salloc,
Fn && fn_, bool preserve_fpu_) :
other( nullptr),
caller( boost::context::execution_context::current() ),
callee( palloc, salloc,
[=,fn=std::forward< Fn >( fn_)] () mutable -> decltype( auto) {
// create synthesized pull_coroutine< T >
typename pull_coroutine< T & >::control_block synthesized_cb( this);
pull_coroutine< T & > synthesized( & synthesized_cb);
other = & synthesized_cb;
try {
// call coroutine-fn with synthesized pull_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 |= static_cast< int >( state_t::complete);
caller( preserve_fpu);
BOOST_ASSERT_MSG( false, "push_coroutine is complete");
}),
preserve_fpu( preserve_fpu_),
state( static_cast< int >( state_t::unwind) ),
except(),
t( nullptr) {
}
template< typename T >
push_coroutine< T & >::control_block::control_block( typename pull_coroutine< T & >::control_block * cb) :
other( cb),
caller( other->callee),
callee( other->caller),
preserve_fpu( other->preserve_fpu),
state( 0),
except(),
t( nullptr) {
}
template< typename T >
push_coroutine< T & >::control_block::~control_block() {
if ( 0 == ( state & static_cast< int >( state_t::complete ) ) &&
0 != ( state & static_cast< int >( state_t::unwind) ) ) {
// set early-exit flag
state |= static_cast< int >( state_t::early_exit);
callee( preserve_fpu);
}
}
template< typename T >
void
push_coroutine< T & >::control_block::resume( T & t_) {
t = & t_;
callee( preserve_fpu);
t = nullptr;
if ( except) {
std::rethrow_exception( except);
}
// test early-exit-flag
if ( 0 != ( ( other->state) & static_cast< int >( state_t::early_exit) ) ) {
throw forced_unwind();
}
}
template< typename T >
bool
push_coroutine< T & >::control_block::valid() const noexcept {
return 0 == ( state & static_cast< int >( state_t::complete) );
}
// push_coroutine< void >
template< typename StackAllocator, typename Fn >
push_coroutine< void >::control_block::control_block( context::preallocated palloc, StackAllocator salloc, Fn && fn_, bool preserve_fpu_) :
other( nullptr),
caller( boost::context::execution_context::current() ),
callee( palloc, salloc,
[=,fn=std::forward< Fn >( fn_)] () mutable -> decltype( auto) {
// create synthesized pull_coroutine< T >
typename pull_coroutine< void >::control_block synthesized_cb( this);
pull_coroutine< void > synthesized( & synthesized_cb);
other = & synthesized_cb;
try {
// call coroutine-fn with synthesized pull_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 |= static_cast< int >( state_t::complete);
caller( preserve_fpu);
BOOST_ASSERT_MSG( false, "push_coroutine is complete");
}),
preserve_fpu( preserve_fpu_),
state( static_cast< int >( state_t::unwind) ),
except() {
}
inline
push_coroutine< void >::control_block::control_block( pull_coroutine< void >::control_block * cb) :
other( cb),
caller( other->callee),
callee( other->caller),
preserve_fpu( other->preserve_fpu),
state( 0),
except() {
}
inline
push_coroutine< void >::control_block::~control_block() {
if ( 0 == ( state & static_cast< int >( state_t::complete ) ) &&
0 != ( state & static_cast< int >( state_t::unwind) ) ) {
// set early-exit flag
state |= static_cast< int >( state_t::early_exit);
callee( preserve_fpu);
}
}
inline
void
push_coroutine< void >::control_block::resume() {
callee( preserve_fpu);
if ( except) {
std::rethrow_exception( except);
}
// test early-exit-flag
if ( 0 != ( ( other->state) & static_cast< int >( state_t::early_exit) ) ) {
throw forced_unwind();
}
}
inline
bool
push_coroutine< void >::control_block::valid() const noexcept {
return 0 == ( state & static_cast< int >( state_t::complete) );
}
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_COROUTINES2_DETAIL_PUSH_CONTROL_BLOCK_IPP
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