Use lock for sync_wait completion #118

Job	Run time
ci-ubuntu-20.04-g++-10-networking-ON-tls-ON	3m 26s
ci-ubuntu-20.04-g++-10-networking-ON-tls-ON	3m 22s
ci-ubuntu-20.04-g++-10-networking-ON-tls-OFF	3m 28s
ci-ubuntu-20.04-g++-10-networking-ON-tls-OFF	3m 21s
ci-ubuntu-22.04-clang (16, 20, ON, ON)	3m 27s
ci-ubuntu-22.04-g++ (11, 20, ON, ON)	3m 23s
ci-ubuntu-20.04-g++-10-networking-OFF-tls-OFF	2m 48s
ci-ubuntu-22.04-clang (16, 23, ON, ON)	3m 24s
ci-ubuntu-22.04-g++ (11, 23, ON, ON)	3m 6s
ci-ubuntu-20.04-g++-10-networking-OFF-tls-OFF	2m 34s
ci-ubuntu-22.04-clang (17, 20, ON, ON)	3m 43s
ci-ubuntu-22.04-g++ (12, 20, ON, ON)	3m 30s
ci-ubuntu-22.04-clang (17, 23, ON, ON)	3m 38s
ci-ubuntu-22.04-g++ (12, 23, ON, ON)	3m 28s
ci-ubuntu-22.04-g++ (13, 20, ON, ON)	3m 27s
ci-ubuntu-22.04-g++ (13, 23, ON, ON)	3m 33s
	53m 38s

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