ceph/src/rgw/rgw_boost_asio_yield.h

   1 //
   2 // copy of needed macors from yield.hpp
   3 //
   4 // Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   5 //
   6 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   7 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9
  10 #ifndef RGW_BOOST_ASIO_YIELD_H
  11 #define RGW_BOOST_ASIO_YIELD_H
  12
  13 #ifdef HAVE_BOOST_ASIO_COROUTINE
  14 #include <boost/asio/yield.hpp>
  15 #else
  16 #define BOOST_ASIO_CORO_REENTER(c) \
  17   switch (::boost::asio::detail::coroutine_ref _coro_value = c) \
  18     case -1: if (_coro_value) \
  19     { \
  20       goto terminate_coroutine; \
  21       terminate_coroutine: \
  22       _coro_value = -1; \
  23       goto bail_out_of_coroutine; \
  24       bail_out_of_coroutine: \
  25       break; \
  26     } \
  27     else case 0:
  28
  29 #define BOOST_ASIO_CORO_YIELD_IMPL(n) \
  30   for (_coro_value = (n);;) \
  31     if (_coro_value == 0) \
  32     { \
  33       case (n): ; \
  34       break; \
  35     } \
  36     else \
  37       switch (_coro_value ? 0 : 1) \
  38         for (;;) \
  39           case -1: if (_coro_value) \
  40             goto terminate_coroutine; \
  41           else for (;;) \
  42             case 1: if (_coro_value) \
  43               goto bail_out_of_coroutine; \
  44             else case 0:
  45
  46 #define BOOST_ASIO_CORO_FORK_IMPL(n) \
  47   for (_coro_value = -(n);; _coro_value = (n)) \
  48     if (_coro_value == (n)) \
  49     { \
  50       case -(n): ; \
  51       break; \
  52     } \
  53     else
  54
  55 #if defined(_MSC_VER)
  56 # define BOOST_ASIO_CORO_YIELD BOOST_ASIO_CORO_YIELD_IMPL(__COUNTER__ + 1)
  57 # define BOOST_ASIO_CORO_FORK BOOST_ASIO_CORO_FORK_IMPL(__COUNTER__ + 1)
  58 #else // defined(_MSC_VER)
  59 # define BOOST_ASIO_CORO_YIELD BOOST_ASIO_CORO_YIELD_IMPL(__LINE__)
  60 # define BOOST_ASIO_CORO_FORK BOOST_ASIO_CORO_FORK_IMPL(__LINE__)
  61 #endif // defined(_MSC_VER)
  62
  63 #ifndef reenter
  64 # define reenter(c) BOOST_ASIO_CORO_REENTER(c)
  65 #endif
  66
  67 #ifndef yield
  68 # define yield BOOST_ASIO_CORO_YIELD
  69 #endif
  70
  71 #ifndef fork
  72 # define fork BOOST_ASIO_CORO_FORK
  73 #endif
  74
  75 #endif // HAVE_BOOST_ASIO_COROUTINE
  76
  77 #endif // RGW_BOOST_ASIO_YIELD_H
  78