diff options
Diffstat (limited to 'boost/context/continuation_ucontext.hpp')
| -rw-r--r-- | boost/context/continuation_ucontext.hpp | 40 |
1 files changed, 25 insertions, 15 deletions
diff --git a/boost/context/continuation_ucontext.hpp b/boost/context/continuation_ucontext.hpp index 6f964dc6f6..94457f7e0f 100644 --- a/boost/context/continuation_ucontext.hpp +++ b/boost/context/continuation_ucontext.hpp @@ -84,18 +84,18 @@ static void entry_func( void * data) noexcept { struct BOOST_CONTEXT_DECL activation_record { thread_local static activation_record * current_rec; - ucontext_t uctx{}; - stack_context sctx{}; - bool main_ctx{ true }; - activation_record * from{ nullptr }; - std::function< void(activation_record*&) > ontop{}; - bool terminated{ false }; - bool force_unwind{ false }; + ucontext_t uctx{}; + stack_context sctx{}; + bool main_ctx{ true }; + activation_record * from{ nullptr }; + std::function< activation_record*(activation_record*&) > ontop{}; + bool terminated{ false }; + bool force_unwind{ false }; #if defined(BOOST_USE_ASAN) - void * fake_stack{ nullptr }; - void * stack_bottom{ nullptr }; - std::size_t stack_size{ 0 }; - bool started{ false }; + void * fake_stack{ nullptr }; + void * stack_bottom{ nullptr }; + std::size_t stack_size{ 0 }; + bool started{ false }; #endif static activation_record *& current() noexcept; @@ -168,20 +168,30 @@ struct BOOST_CONTEXT_DECL activation_record { current()->ontop = std::bind( [](typename std::decay< Fn >::type & fn, activation_record *& ptr){ Ctx c{ ptr }; - fn( std::move( c) ); + c = fn( std::move( c) ); if ( ! c) { ptr = nullptr; } +#if defined(BOOST_NO_CXX14_STD_EXCHANGE) + return exchange( c.ptr_, nullptr); +#else + return std::exchange( c.ptr_, nullptr); +#endif }, std::forward< Fn >( fn), std::placeholders::_1); #else current()->ontop = [fn=std::forward<Fn>(fn)](activation_record *& ptr){ Ctx c{ ptr }; - fn( std::move( c) ); + c = fn( std::move( c) ); if ( ! c) { ptr = nullptr; } +#if defined(BOOST_NO_CXX14_STD_EXCHANGE) + return exchange( c.ptr_, nullptr); +#else + return std::exchange( c.ptr_, nullptr); +#endif }; #endif #if defined(BOOST_USE_SEGMENTED_STACKS) @@ -408,7 +418,7 @@ public: if ( BOOST_UNLIKELY( detail::activation_record::current()->force_unwind) ) { throw detail::forced_unwind{ ptr}; } else if ( BOOST_UNLIKELY( nullptr != detail::activation_record::current()->ontop) ) { - detail::activation_record::current()->ontop( ptr); + ptr = detail::activation_record::current()->ontop( ptr); detail::activation_record::current()->ontop = nullptr; } return continuation{ ptr }; @@ -426,7 +436,7 @@ public: if ( BOOST_UNLIKELY( detail::activation_record::current()->force_unwind) ) { throw detail::forced_unwind{ ptr}; } else if ( BOOST_UNLIKELY( nullptr != detail::activation_record::current()->ontop) ) { - detail::activation_record::current()->ontop( ptr); + ptr = detail::activation_record::current()->ontop( ptr); detail::activation_record::current()->ontop = nullptr; } return continuation{ ptr }; |