std::experimental::flex_barrier
| Defined in header
<experimental/barrier>
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| class flex_barrier;
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(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.
[edit] Member functions
constructs a flex_barrier (public member function) |
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destroys the flex_barrier (public member function) |
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| not copy-assignable (public member function) |
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| arrive at the synchronization point and block (public member function) |
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| arrive at the synchronization point and remove the current thread from the set of participating threads (public member function) |