That is, it would be more efficient to allow readers to run while other readers held the lock, but you'd risk a constant stream of reader threads keeping the writer from ever doing its job.
即，允许一些读取器在其他读取器锁定时运行效率更高，但是您可能会有读取器线程的流持续不断的风险，导致编写器无法进行工作。
If the queue is full, the writer thread waits on the _wcond condition variable; the reader thread will need a notification to all threads after consuming data from the queue.
如果队列满了，写线程等待_ wcond条件变量；读线程在从队列中取出数据之后需要通知所有线程。
Instead, all data that passes from the reader to the writer is kept in AXIOM.
相反，从reader传递给writer的所有数据都保留在AXIOM中。
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