/Src/Dependencies/Boost/boost/memory_order.hpp

http://hadesmem.googlecode.com/ · C++ Header · 53 lines · 18 code · 9 blank · 26 comment · 1 complexity · f9c8ae35cca5b2e0498de58d4b065a8e MD5 · raw file 

    

  1. #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED
    2. 

  2. #define BOOST_MEMORY_ORDER_HPP_INCLUDED
    3. 

  3. 

  4. // MS compatible compilers support #pragma once
    5. 

  5. 

  6. #if defined(_MSC_VER) && (_MSC_VER >= 1020)
    7. 

  7. # pragma once
    8. 

  8. #endif
    9. 

  9. 

  10. //  boost/memory_order.hpp
    11. 

  11. //
    12. 

  12. //  Defines enum boost::memory_order per the C++0x working draft
    13. 

  13. //
    14. 

  14. //  Copyright (c) 2008, 2009 Peter Dimov
    15. 

  15. //
    16. 

  16. //  Distributed under the Boost Software License, Version 1.0.
    17. 

  17. //  See accompanying file LICENSE_1_0.txt or copy at
    18. 

  18. //  http://www.boost.org/LICENSE_1_0.txt)
    19. 

  19. 

  20. 

  21. namespace boost
    22. 

  22. {
    23. 

  23. 

  24. //
    25. 

  25. // Enum values are chosen so that code that needs to insert
    26. 

  26. // a trailing fence for acquire semantics can use a single
    27. 

  27. // test such as:
    28. 

  28. //
    29. 

  29. // if( mo & memory_order_acquire ) { ...fence... }
    30. 

  30. //
    31. 

  31. // For leading fences one can use:
    32. 

  32. //
    33. 

  33. // if( mo & memory_order_release ) { ...fence... }
    34. 

  34. //
    35. 

  35. // Architectures such as Alpha that need a fence on consume
    36. 

  36. // can use:
    37. 

  37. //
    38. 

  38. // if( mo & ( memory_order_acquire | memory_order_consume ) ) { ...fence... }
    39. 

  39. //
    40. 

  40. 

  41. enum memory_order
    42. 

  42. {
    43. 

  43.     memory_order_relaxed = 0,
    44. 

  44.     memory_order_acquire = 1,
    45. 

  45.     memory_order_release = 2,
    46. 

  46.     memory_order_acq_rel = 3, // acquire | release
    47. 

  47.     memory_order_seq_cst = 7, // acq_rel | 4
    48. 

  48.     memory_order_consume = 8
    49. 

  49. };
    50. 

  50. 

  51. } // namespace boost
    52. 

  52. 

  53. #endif // #ifndef BOOST_MEMORY_ORDER_HPP_INCLUDED
    54.