Re: [Boost-users] Thread cancellation

From: Chris Coleman (cqc_at_[hidden])
Date: 2005-02-11 04:32:21

Hi Ben, and others.

Many thanks for taking the time to reply to the original questions, they 
have proved most useful in providing me with a solution to my problem.

>  Depending on why and how the thread is sleeping, it may be possible 
> to interrupt such a sleep by sending the thread a signal or writing to 
> a pipe.

I'm still a little confused by this last sentence.  At present I have 
opted for an arbitrary time on a timed wait on the condition variable 
that was causing the threads to sleep.  This seems to work, but 
obviously there is a delay in the time the thread takes to die of up to 
the length of the timed wait. 

All the threads are waiting on the same condition variable, I can find 
nothing in the Docs about anything else that will cause the threads to 
wake while waiting on a condition variable.  Notify_one is no good since 
it is unspecified which thread shall be woken, and notify_all seems a 
little excessive when only a specific thread needs waking.  Although I 
guess once woken all the other threads will do will be to see that their 
living flag is still true, and that there are no tasks to process and as 
such go back to sleep.  Whatever solution is chosen it needs to be 
highly portable.

Many Thanks again
Cheers
Chris

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