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Fix runtime data races, memory leak, and shutdown safety #36

Job	Run time
macos (arm64)	51s
ios (iphonesimulator, VENDORED, VENDORED)	58s
ios (iphoneos, SYSTEM, SYSTEM)	1m 6s
installed-package-macos	52s
macos (arm64;x86_64)	1m 14s
installed-package-linux (fetched)	1m 16s
linux (self-contained, STATIC, OFF, ON, OFF, OFF)	1m 18s
installed-package-linux (system)	49s
windows	2m 44s
linux (system, STATIC, OFF, OFF, ON, ON)	53s
android	1m 3s
linux (system, SHARED, ON, ON, OFF, OFF)	48s
	13m 52s