Technical Specification
Filesystem library (filesystem TS)
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Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
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Defined in header <experimental/barrier>
class barrier;
(concurrency TS)

The class std::experimental::barrier provides a thread-coordination mechanism that allows a set of participating threads to block until an operation is completed. Unlike std::experimental::latch, barriers are reusable; once the participating threads are released from a barrier's synchronization point, they can reuse the same barrier.

A barrier has a completion phase, which is executed by one of the participating threads once all threads in the set of participating threads arrive at the synchronization point. The arrive_and_wait and arrive_and_drop calls synchronize with the start of the completion phase; the end of the completion phase synchronizes with the returns from all calls blocked by its completion.

For std::experimental::barrier, the completion phase is empty. std::experimental::flex_barrier allows the user to control the completion phase with a function object.

The set of participating threads for a barrier constructed for num_threads threads is the first num_threads threads to arrive at its synchronization point after construction. The same set of threads (except for threads that called arrive_and_drop()) must arrive at the barrier each cycle.

[edit] Member functions

constructs a barrier
(public member function) [edit]
destroys the barrier
(public member function) [edit]
not copy-assignable
(public member function) [edit]
arrive at the synchronization point and block
(public member function) [edit]
arrive at the synchronization point and remove the current thread from the set of participating threads
(public member function) [edit]