Runloop is not thread-safe

[langyanduan]

It seem the lib add Timer to Runloop.main in network thread (generally not main thread).
But the document warning NSRunLoop is not thread safe.

The NSRunLoop class is generally not considered to be thread-safe and its methods should only be called within the context of the current thread. You should never try to call the methods of an NSRunLoop object running in a different thread, as doing so might cause unexpected results.

Core Foundation are generally thread-safe, use CFRunLoop* may be better.

[cnoon]

Good catch @langyanduan. I've just pushed up 0f6bc51 which addresses the issue. This change will go out in a release here shortly.

Thanks again! 🍻