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由 Patrick Mahoney 提交于
The core of this fix is a threadsafe, fair Queue class. It is very similar to Queue in stdlib except that it supports waiting with a timeout. The issue this solves is that if several threads are contending for database connections, an unfair queue makes is possible that a thread will timeout even while other threads successfully acquire and release connections. A fair queue means the thread that has been waiting the longest will get the next available connection. This includes a few test fixes to avoid test ordering issues that cropped up during development of this patch.
02b23355