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The <experimental/barrier> header provides two barrier classes, which provide a means of ensuring that a given set of threads are synchronized.

The participating threads block at a synchronization point by calling arrive_and_wait. Once all the threads have reached the synchronization point, one thread calls the completion function (if any), and then all participating threads are unblocked.

Threads may signal that they no longer wish to participate in the synchronization by calling arrive_and_drop on the barrier instead. This will contribute to unlocking any blocked threads, without blocking the calling thread. The calling thread may not then call any member functions on the barrier again.

namespace std{
    namespace experimental{
        class barrier;
        class flex_barrier;

The std::experimental::barrier class provides a basic barrier with no completion function. The std::experimental::flex_barrier class allows you to provide a completion function. The completion function can reduce the number of threads that participate in the synchronization.

See Also