tree c669769a9e6a77a778070aab42533fa3e163dfab
parent 987f91a6536e0330799cc5f4e54740c4023b5ef0
author Manojkiran Eda <manojkiran.eda@gmail.com> 1640043587 +0530
committer Kuiying Wang <wangkuiying.wky@alibaba-inc.com> 1644474828 +0000

Switch to a thread safe single ton

In the current state the single ton pattern used in the
repository is not thread safe.

Switching the pattern to Meyer's single ton over the trusty
leaky single ton.

Ref : https://jinyu.li/notes/meyers-singleton/

Tested By :
1. Patched post-code-manager deamon & was able to get the post
   codes with the GetPostCodesWithTimeStamp method.

Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: I0ee5c21f15fc93e1d8c5e62a0fed33622a33c894