# std::experimental::barrier::arrive_and_drop

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< cpp‎ | experimental‎ | barrier

void arrive_and_drop(); |  | (concurrency TS)

Arrive at the barrier's synchronization point and remove the current thread from the set of participating threads. It is unspecified whether this function blocks until the completion phase has ended.

The behavior is undefined if the calling thread is not in the set of participating threads of this barrier.

Calls to `arrive_and_drop` synchronizes with the start of the completion phase of the barrier. If the call blocks, then the completion of the completion phase synchronizes with the return from the call.

Calls to `arrive_and_drop` and `arrive_and_wait` never introduce data races with themselves or each other.

### Exceptions

Throws nothing.

### Notes

If every participating thread calls `arrive_and_drop()`, the barrier can only be destroyed.

After a thread calls `arrive_and_drop()` on a barrier, it is no longer a member of its set of participating threads and hence can no longer call either `arrive_and_drop()` or `arrive_and_wait()` on the same barrier.

### See also

arrive_and_wait | arrive at the synchronization point and block (public member function)

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