Simon Willnauer acf2d2f86f Ensure new connections won't be opened if transport is closed or closing (#22589)
Today there are several races / holes in TcpTransport and MockTcpTransport
that can allow connections to be opened and remain unclosed while the actual
transport implementation is closed. A recently added assertions in #22554 exposes
these problems. This commit fixes several issues related to missed locks or channel
creations outside of a lock not checking if the resource is still open.
2017-01-12 20:27:09 +01:00
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