Problem: race condition in PUSH might break atomicity #3343
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Solution: if a multi-part message cannot be delivered by a PUSH socket because the pipe is broken mid-way, drop the rest of the frames so that the atomicity property is not broken.
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Solution: if a multi-part message cannot be delivered by a PUSH socket
because the pipe is broken mid-way, drop the rest of the frames so that
the atomicity property is not broken.
Fixes zeromq/pyzmq#1244