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This gate behaves like a barrier, but it can be opened, meaning that threads can be released before all threads arrived at the gate. This lets us release waiting threads in case of an error, which will be important for the sender side of a live migration with multiple TCP connections. On-behalf-of: SAP sebastian.eydam@sap.com Signed-off-by: Sebastian Eydam <sebastian.eydam@cyberus-technology.de>