Boost logo

Boost Users :

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

Boost-users list run by williamkempf at, kalb at, bjorn.karlsson at, gregod at, wekempf at