[#BloombergLP-bdlmt-MultiQueueThreadPool-drain]
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Wait until all queues are empty. This method waits until all non‐paused queues are empty without disabling the queues (and may thus wait indefinitely). The queues and/or the thread pool may be either enabled or disabled when this method is called. This method may be called on a stopped or started thread pool. Note that `drain` does not attempt to delete queues directly. However, as a side‐effect of emptying all queues, any queue for which `deleteQueue` was called previously will be deleted before `drain` returns. Note also that this method waits by repeatedly yielding.

== Synopsis

Declared in `<bdlmt_multiqueuethreadpool.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
drain();
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