tree 99ba68888591ce76eedba46c7f68e1c53199ec9e
parent ca6f40c8805ac1ec4c94afccfc99a3f539dbd7f4
author Damien Neil <dneil@google.com> 1580337611 -0800
committer Damien Neil <dneil@google.com> 1580339077 +0000

internal/impl: avoid redundant lazy extension inits

After taking the lock on a lazy extension's state, check to see if it
was initialized while we were waiting for the lock.

Change-Id: I1cbd52e9d655eec6c9142c97689ae36f219a28f2
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/216898
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>