ceph/src/boost/boost/coroutine/detail/coroutine_context.hpp

   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
  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