NAME¶

std::experimental::flex_barrier - std::experimental::flex_barrier

Synopsis¶

Defined in header <experimental/barrier>
class flex_barrier; (concurrency TS)

The class std::experimental::flex_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.

std::experimental::flex_barrier allows the user to control the completion phase with
a function object. If the function object returns -1, the set of participating
threads is unchanged (and the same set of participating threads must arrive at the
synchronization point in the next cycle); otherwise the set of participating threads
becomes a new set with a size equal to the returned value N, and consists of the
next N threads to arrive at the barrier's synchronization point.

Users who do not need this functionality can use std::experimental::barrier.

Member functions¶

constructor constructs a flex_barrier
(public member function)
destructor destroys the flex_barrier
(public member function)
operator= not copy-assignable
[deleted] (public member function)
arrive_and_wait arrive at the synchronization point and block
(public member function)
arrive at the synchronization point and remove the current thread
arrive_and_drop from the set of participating threads
(public member function)