Re: [Boost-users] [thread] Never enter critical section [NC]

From: frederic.mayot_at_[hidden]
Date: 2007-08-30 15:28:25

>The code is totally and irrecoverably broken (from a threading 
perspective). 
>There is no way to fix it if it has to retain its current form.

Well... let's take the example of an interruptible task. We have a main 
program which launches a thread.
Now, we want to stop this thread. We can use interruption or the following 
code:

T1:
while(true)
{
        lock lk(mutex);
        if (end) break;
        /* dosomething */
}

T2:
interruptT1()
{
        lock lk(mutex);
        end = true;
}

>The basic idea when using threads is to create parallelism. Thread T1 is 
>inherently non-parallel. It simply cannot operate in parallel with anyone 

>else who also needs to access the shared state that is protected by the 
>mutex.

That's what I call contention (when your threads work in a collaborative 
way)...

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