Fix race condition in resty.limit.req using ngx.shared.DICT.set_when

[hnakamur]

This pull request fixes the race condition in resty.limit.req.

The following pull request must be merged before merging this pull request.

• Add shdict set_when and safe_set_when by hnakamur · Pull Request #268 · openresty/lua-resty-core

I hereby granted the copyright of the changes in this pull request
to the authors of this lua-resty-core project.

[hnakamur]

Test passes with my pull request branches for lua-nginx-module and lua-resty-core.
https://travis-ci.org/hnakamur/lua-resty-limit-traffic/builds/576456344

Could you review this pull request?
Thanks!

[lkad]

Test passes with my pull request branches for lua-nginx-module and lua-resty-core. https://travis-ci.org/hnakamur/lua-resty-limit-traffic/builds/576456344

Could you review this pull request? Thanks!

Hi @hnakamur,
I hope this message finds you well. I wanted to ask if you are currently using the changes from Pull Request in a production environment. Your insights would be greatly appreciated!
Thank you!

[hnakamur]

Hi @lkad,
No, I'm not using the changes from the pull request in a produciton environment.