Re: [Boost-users] [thread] : pause/resume thread

Subject: Re: [Boost-users] [thread] : pause/resume thread
From: Viatcheslav.Sysoltsev_at_[hidden]
Date: 2011-04-15 09:18:06

> Hi All, I have just started learning boost. I want my thread to support
> following functions
> Pause();
> Resume();
> Stop();.
> I have come up with following code, which ends up as dead lock. Can some  
> one
> please guide me as how to achieve the desired functionality.
> Would really appreciate any help.
> Thanks.
> Kaz
> class qthread
> {
> public:
>     boost::thread* mThread;
>     boost::condition_variable mCond;
>     boost::mutex mMutex;
>     bool mExit;
>     qthread(): mExit(false)
>     {
>         // create function pointer to local Execute function
>         boost::function<void (qthread*)> fptr = &qthread::Execute;
>         fptr(this);
you call Execute() here in the main thread

>         // pass on function pointer along with this reference to boost
> thread
>         boost::thread th0( fptr, this);
>         // assign temp thread to local variable
>         mThread = &th0;
>     }
and now your th0 is destroyed leaving invalid pointer. Strange, I thought  
gcc has already learned to warn about such stuff, but I don't get any  
warning with gcc 4.3.2 here even with -Wall

>         mCond.wait(lock);       //<< DEAD LOCK
It's not a dead lock, don't swear with so scary words ;). If you'd debug  
the program, you see you are still having only one thread by the time.

-- Slava