Re: [Boost-Users] Re: Newbie query: no "deamon" thread?

From: dick.bridges_at_[hidden]
Date: 2003-06-06 11:44:00

I was asking this question for someone else.  Except for trivial programs,
I always use one form of pool or another.  Spend a lot of time reading
"pattern" books.  To tell the truth, I have no idea what the "real" cost of
creating & killing threads is for the various OSs.  I just treat it like
small object memory allocation:  if you don't have a custom allocator, try
to avoid doing it.  ;)

                                                                                                                                       
                      Mark Sizer                                                                                                       
                      <yg-boost-users_at_m         To:      boost-users_at_[hidden]                                                   
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                      06/05/2003 05:23                                                                                                 
                      PM                                                                                                               
                      Please respond to                                                                                                
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BTW: Is there enough of a penalty to creating threads that a thread pool
should be used rather than creating them on-demand? I'm curious because
I'm using a pool pulling from a work queue.

- Mark

P.S. I realize "enough" is a bit vague.

Mark Sizer wrote:

> What is "the right thing"?
>
> You don't HAVE to join(). The creating thread will just keep going if
> you don't. If you join, it waits.
>
> If you're passing ownership (e.g. delete responsibility) across thread
> boundaries, you have to be careful, but that doesn't have much to do
> with join().
>
> After starting the thread, you can use a condtional in the creator to
> wait for the thread to "get going" and accept ownership, sort of a
> "started()" rather than an "ended()", like join(). Or you can flip it
> around and have the started thread wait on the conditional whilst the
> creator thread continues to use what will eventually be given to the
thread.
>
> Is that at all helpful?
>
> - Mark
>
> dick.bridges_at_[hidden] wrote:
>
>
>>I need to spawn worker threads that simply perform a task and exit.  All
>>the examples I can find seem to use join() to cleanup the thread
resources
>>from another thread.  Isn't there some way to declare worker threads so
>>that they "do the right thing" as they exit the thread function?
>>
>>TIA
>>
>>
>>
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