Make send check non-blocking to allow other workers to be progressed #132
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What
Make
ucx_send_check()
connection establishment non-blocking. This prepares later patch changing worker allocation scheme.Why
When blocking on send check, this could cause dead-locks if on more than one node, other endpoints on other workers need to be progressed.
How
Make send check non-blocking. Next cleanup step can be moving send/recv check functions to connect/accept, delayed as it is causing other issues (#128)