CODEWITHSUNDEEP
c++cmultithreadingsynchronization
pythonic
pythonic

Reputation: 21625

Can we call a potential barrier in a program

I want my threads to stop at a barrier point, but I want to only stop if a barrier is required. For example after a certain timer interval, I want all of threads to form a barrier. Is there a method to put a potential barrier point? For example at start of each function. I want something like this.

void some_function()
{
 potentially_barrier_wait;
 ......
}

So I want potentially_barrier_wait to only call a barrier if its required, otherwise potentially_barrier_wait do nothing. Can this thing be implemented satisfactorily? Will this also work in programs which already have barriers in them, or will it race with them.

Upvotes: 1

Views: 141

Answers (1)

mark
mark

Reputation: 5469

Depends on what you mean by barrier... if you are referring to simple synchronization, you can do it like this:

On Windows, create an event CreateEvent( 0, false, 0, 0 ). In your thread, do a WaitForSingleObject on that. In your "controlling" thread, SetEvent it to let it pass your barrier. You can play with it to have it pre-set, and auto-release, etc.

On Linux, similar but you can use a pthread_cond_timedwait as your barrier, and signal it with pthread_cond_signal.

Upvotes: 1

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