Re: [Boost-users] [thread] how to use thread::timed_join

21 Apr 2008

      Jeff Garland wrote:
...
On Sun, Apr 20, 2008 at 12:49 AM, Anthony Williams 
mailto:anthony_w.geo@yahoo.com> wrote:
Johan Råde mailto:rade@maths.lth.se> writes:
> I want to do a timed join, with  a relative time of 0.1s.
     > I can not figure out from the docs how to do this.
     > I find the prototypes somewhat mystifying:
     >
     >      bool timed_join(const system_time& wait_until);
     >
     >      template<typename TimeDuration> bool timed_join(TimeDuration
    const& rel_time);
     >
     > What is system_time?
     > What should TimeDuration be?
system_time is declared in boost/thread/thread_time.hpp: it is a
    typedef to
    boost::posix_time::ptime from the date-time library.
TimeDuration is any boost date-time
    duration. e.g. boost::posix_time::milliseconds
You are not the only person to notice the missing docs for the timeout
    stuff. It's on my list of things to add.
There's some examples of how to construct these types on the boost 
date-time docs:
http://www.boost.org/doc/libs/1_35_0/doc/html/date_time/posix_time.html#date...
You can use time_duration, but really the easy way is to construct from 
the 'count types'": milliseconds, nanoseconds, etc.
Jeff
Thanks for the help.
I had never used the Boost.DateTime library before and hadn't realized
that the Boost.Thread library interface depends on the Boost.DateTime library.

Boost.DateTime looks like an excellent library.
I will make more use of it in the future.

A minor annoyance with Boost.DateTime:

boost::posix_time::milliseconds is a bit too verbose for my taste,
while just milliseconds is too brief.
posix_time::milliseconds seems just right.

If posix_time had been a class, then you could have written

    using boost::posix_time;

    ... posix_time::milliseconds ...

But since posix_time is a name space that can not be achieved.

Is there any way in C++ of bringing the name of namespace into the global scope
without bringing every name inside the namespace into the global scope?

--Johan
...
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