ceph/src/boost/boost/smart_ptr/detail/sp_thread_yield.hpp

   1 #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_YIELD_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_DETAIL_SP_THREAD_YIELD_HPP_INCLUDED
   3
   4 // MS compatible compilers support #pragma once
   5
   6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   7 # pragma once
   8 #endif
   9
  10 // boost/smart_ptr/detail/sp_thread_yield.hpp
  11 //
  12 // inline void bost::detail::sp_thread_yield();
  13 //
  14 //   Gives up the remainder of the time slice,
  15 //   as if by calling sched_yield().
  16 //
  17 // Copyright 2008, 2020 Peter Dimov
  18 // Distributed under the Boost Software License, Version 1.0
  19 // https://www.boost.org/LICENSE_1_0.txt
  20
  21 #include <boost/config.hpp>
  22 #include <boost/config/pragma_message.hpp>
  23
  24 #if defined( WIN32 ) || defined( _WIN32 ) || defined( __WIN32__ ) || defined( __CYGWIN__ )
  25
  26 #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
  27   BOOST_PRAGMA_MESSAGE("Using Sleep(0) in sp_thread_yield")
  28 #endif
  29
  30 #include <boost/smart_ptr/detail/sp_win32_sleep.hpp>
  31
  32 namespace boost
  33 {
  34
  35 namespace detail
  36 {
  37
  38 inline void sp_thread_yield()
  39 {
  40     Sleep( 0 );
  41 }
  42
  43 } // namespace detail
  44
  45 } // namespace boost
  46
  47 #elif defined(BOOST_HAS_SCHED_YIELD)
  48
  49 #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
  50   BOOST_PRAGMA_MESSAGE("Using sched_yield() in sp_thread_yield")
  51 #endif
  52
  53 #ifndef _AIX
  54 # include <sched.h>
  55 #else
  56   // AIX's sched.h defines ::var which sometimes conflicts with Lambda's var
  57   extern "C" int sched_yield(void);
  58 #endif
  59
  60 namespace boost
  61 {
  62
  63 namespace detail
  64 {
  65
  66 inline void sp_thread_yield()
  67 {
  68     sched_yield();
  69 }
  70
  71 } // namespace detail
  72
  73 } // namespace boost
  74
  75 #else
  76
  77 #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
  78   BOOST_PRAGMA_MESSAGE("Using sp_thread_pause() in sp_thread_yield")
  79 #endif
  80
  81 #include <boost/smart_ptr/detail/sp_thread_pause.hpp>
  82
  83 namespace boost
  84 {
  85
  86 namespace detail
  87 {
  88
  89 inline void sp_thread_yield()
  90 {
  91     sp_thread_pause();
  92 }
  93
  94 } // namespace detail
  95
  96 } // namespace boost
  97
  98 #endif
  99
 100 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_YIELD_HPP_INCLUDED