ceph/src/boost/libs/thread/doc/time.qbk

   1 [/
   2   (C) Copyright 2007-8 Anthony Williams.
   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
   8 [section:time Time Requirements]
   9
  10 As of Boost 1.50.0, the __boost_thread__ library uses Boost.Chrono library for all operations that require a
  11 time out as defined in the standard c++11. These include (but are not limited to):
  12
  13 * `boost::this_thread::__sleep_for`
  14 * `boost::this_thread::__sleep_until`
  15 * `boost::__thread::__try_join_for`
  16 * `boost::__thread::__try_join_until`
  17 * `boost::__condition_variable::__wait_for`
  18 * `boost::__condition_variable::__wait_until`
  19 * `boost::__condition_variable_any::__cvany_wait_for`
  20 * `boost::__condition_variable_any::__cvany_wait_until`
  21 * `__TimedLockable::__try_lock_for`
  22 * `__TimedLockable::__try_lock_until`
  23
  24 [section:deprecated Deprecated]
  25 The time related functions introduced in Boost 1.35.0, using the [link date_time Boost.Date_Time] library are deprecated. These include (but are not limited to):
  26
  27 * __sleep__
  28 * __timed_join__
  29 * __cond_timed_wait__
  30 * __timed_lock_ref__
  31
  32 For the overloads that accept an absolute time parameter, an object of type [link thread.time.deprecated.system_time `boost::system_time`] is
  33 required. Typically, this will be obtained by adding a duration to the current time, obtained with a call to [link
  34 thread.time.deprecated.get_system_time `boost::get_system_time()`]. e.g.
  35
  36     boost::system_time const timeout=boost::get_system_time() + boost::posix_time::milliseconds(500);
  37
  38     extern bool done;
  39     extern boost::mutex m;
  40     extern boost::condition_variable cond;
  41
  42     boost::unique_lock<boost::mutex> lk(m);
  43     while(!done)
  44     {
  45         if(!cond.timed_wait(lk,timeout))
  46         {
  47             throw "timed out";
  48         }
  49     }
  50
  51 For the overloads that accept a ['TimeDuration] parameter, an object of any type that meets the [link
  52 date_time.posix_time.time_duration Boost.Date_Time Time Duration requirements] can be used, e.g.
  53
  54     boost::this_thread::sleep(boost::posix_time::milliseconds(25));
  55
  56     boost::mutex m;
  57     if(m.timed_lock(boost::posix_time::nanoseconds(100)))
  58     {
  59         //  ...
  60     }
  61
  62 [section:system_time Typedef `system_time`]
  63
  64     #include <boost/thread/thread_time.hpp>
  65
  66     typedef boost::posix_time::ptime system_time;
  67
  68 See the documentation for [link date_time.posix_time.ptime_class `boost::posix_time::ptime`] in the Boost.Date_Time library.
  69
  70 [endsect]
  71
  72 [section:get_system_time Non-member function `get_system_time()`]
  73
  74     #include <boost/thread/thread_time.hpp>
  75
  76     system_time get_system_time();
  77
  78 [variablelist
  79
  80 [[Returns:] [The current time.]]
  81
  82 [[Throws:] [Nothing.]]
  83
  84 ]
  85
  86 [endsect]
  87 [endsect]
  88
  89
  90 [endsect]