Re: [Boost-users] Subject::[boost thread] does a thread block itself when it passes the conditional variable to another thread?

Subject: Re: [Boost-users] Subject::[boost thread] does a thread block itself when it passes the conditional variable to another thread?
From: Igor R (boost.lists_at_[hidden])
Date: 2008-12-08 11:06:33

>
> void thread1(){
>     boost::mutex::scoped_lock lock(mutex);
>
> ...//do some work
>     data_ready=true;
>     cond.notify_one() //assume the condition is satisfied.
>      //do more work    -------my question is will this part continue? or
> thread2 will wake up and block thread 1?
>
> }
>
The thread1() will continue and the thread2() will be still locked. If you
wish to avoid this situation, you have to unlock the mutex manually before
the notification:
lock.unlock();
cond.notify_one();
...as explained here:
http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html