[6.0]Server for thread mode

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 71.56%. Comparing base (44f1c4c) to head (c755983).

Files	Patch %	Lines
src/server/master.cc	72.22%	5 Missing :warning:
src/server/reactor_process.cc	78.57%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v6.0 #5281 +/- ## ========================================== + Coverage 71.54% 71.56% +0.01% ========================================== Files 105 105 Lines 16084 16084 Branches 2972 2972 ========================================== + Hits 11508 11511 +3 + Misses 4522 4518 -4 - Partials 54 55 +1 ```

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