我如何获得提振::状态:: TIMED_WAIT编译？ [英] How do I get boost::condition::timed_wait to compile?

问题描述

我想在条件最多等待1秒。我已经尝试传递TIME_DURATION：

I want to wait on a condition for up to 1 second. I've try passing in time_duration:

boost::posix_time::time_duration td = boost::posix_time::milliseconds(50);
readerThread_cond_.timed_wait(lock, boost::bind(&XXXX::writeCondIsMet, this), td);

但我得到的错误：

but I get the error:

/usr/include/boost/thread/pthread/condition_variable.hpp:156：
  错误：没有对应于运营商+'
  提振:: get_system_time（）+
  wait_duration

/usr/include/boost/thread/pthread/condition_variable.hpp:156: error: no match for ‘operator+’ in ‘boost::get_system_time() + wait_duration’

我也试过路过一个xtime的：

I've also tried passing a xtime:

boost::xtime t;
boost::xtime_get(&t, boost::TIME_UTC);
readerThread_cond_.timed_wait(lock, boost::bind(&XXXX::writeCondIsMet, this), td);

但我得到的错误：

but I get the error:

我与libboost_thread和libboost_date_time和code编译链接和运行正常，当我用只是使用的等待，但似乎错误消息有关解决升压头文件的模板。这似乎是说我没有传递正确的事情，但我就是不明白。

I'm linking with libboost_thread and libboost_date_time and the code compiles and run ok when I use just use wait, but the error message it seems to related to resolving the templates in the boost header files. It seems to be saying I am not passing in the right thing, but I just don't understand it.

推荐答案

我觉得它的参数顺序。

由于我从来没有与 TIMED_WAIT 一个问题，我看了一些细节处<一个href=\"http://www.boost.org/doc/libs/1_37_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref.condition_variable.timed_wait_$p$pdicate\"相对=nofollow>升压参考boost.thread，condition_variable_any，TIMED_WAIT 。我觉得最有趣的是这样的：

As I've never had a problem with timed_wait, I looked at some details at the boost reference to boost.thread, condition_variable_any, timed_wait. What I find most interesting is this:

template<typename lock_type,typename duration_type,typename predicate_type>
bool timed_wait(lock_type& lock,duration_type const& rel_time,predicate_type predicate);

时间持续时间实际上是第二个参数，而不是第三。

The time-duration is actually the second argument, not the third.

顺便说一句，你真的应该检查 TIMED_WAIT 的返回值，否则你不会知道的条件是否你有信号的，或发生超时。 TIMED_WAIT 将不可以抛由于超时！[/编辑]

[edit] BTW, you really should check the return value of timed_wait, as otherwise you won't know whether you the condition got signaled, or a timeout occurred. timed_wait will not throw due to a timeout![/edit]

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