1 2 // Copyright Oliver Kowalke 2009. 3 // Distributed under the Boost Software License, Version 1.0. 4 // (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt) 6 7 #ifndef BOOST_COROUTINES_DETAIL_COROUTINE_CONTEXT_H 8 #define BOOST_COROUTINES_DETAIL_COROUTINE_CONTEXT_H 9 10 #include <cstddef> 11 12 #include <boost/assert.hpp> 13 #include <boost/config.hpp> 14 #include <boost/context/detail/fcontext.hpp> 15 16 #include <boost/coroutine/detail/config.hpp> 17 #include <boost/coroutine/detail/preallocated.hpp> 18 #include <boost/coroutine/stack_context.hpp> 19 20 #ifdef BOOST_HAS_ABI_HEADERS 21 # include BOOST_ABI_PREFIX 22 #endif 23 24 namespace boost { 25 namespace coroutines { 26 namespace detail { 27 28 // class hold stack-context and coroutines execution-context 29 class BOOST_COROUTINES_DECL coroutine_context 30 { 31 private: 32 template< typename Coro > 33 friend void trampoline( context::detail::transfer_t); 34 template< typename Coro > 35 friend void trampoline_void( context::detail::transfer_t); 36 template< typename Coro > 37 friend void trampoline_pull( context::detail::transfer_t); 38 template< typename Coro > 39 friend void trampoline_push( context::detail::transfer_t); 40 template< typename Coro > 41 friend void trampoline_push_void( context::detail::transfer_t); 42 43 preallocated palloc_; 44 context::detail::fcontext_t ctx_; 45 46 public: 47 typedef void( * ctx_fn)( context::detail::transfer_t); 48 49 // default ctor represents the current execution-context 50 coroutine_context(); 51 52 // ctor creates a new execution-context running coroutine-fn `fn` 53 // `ctx_` will be allocated on top of the stack managed by parameter 54 // `stack_ctx` 55 coroutine_context( ctx_fn fn, preallocated const& palloc); 56 57 coroutine_context( coroutine_context const&); 58 59 coroutine_context& operator=( coroutine_context const&); 60 61 void * jump( coroutine_context &, void * = 0); 62 stack_ctx()63 stack_context & stack_ctx() 64 { return palloc_.sctx; } 65 }; 66 67 }}} 68 69 #ifdef BOOST_HAS_ABI_HEADERS 70 # include BOOST_ABI_SUFFIX 71 #endif 72 73 #endif // BOOST_COROUTINES_DETAIL_COROUTINE_CONTEXT_H 74