__gnu_parallel::_RestrictedBoundedConcurrentQueue(3cxx) on Linux

The text b18feb7c348f, as Debian 10 (Buster) shipped it.

Double-ended queue of bounded size, allowing lock-free atomic access. push_front() and pop_front() must not be called concurrently to each other, while pop_back() can be called concurrently at all times. empty(), size(), and top() are intentionally not provided. Calling them would not make sense in a concurrent setting.

__gnu_parallel::_RestrictedBoundedConcurrentQueue(3cxx) on Linux now