improve server

[matyhtf]

No description provided.

[codecov]

Codecov Report

Merging #3557 into master will increase coverage by 0.92%.
The diff coverage is 8.33%.

@@            Coverage Diff             @@
##           master    #3557      +/-   ##
==========================================
+ Coverage   43.98%   44.91%   +0.92%     
==========================================
  Files          76       76              
  Lines       14164    14834     +670     
==========================================
+ Hits         6230     6662     +432     
- Misses       7934     8172     +238     

Impacted Files	Coverage Δ
src/wrapper/server.cc	0.00% <0.00%> (ø)
src/server/reactor_process.cc	41.72% <33.33%> (+0.05%)	⬆️
src/os/async_thread.cc	72.88% <0.00%> (-0.45%)	⬇️
src/os/thread_pool.cc	75.64% <0.00%> (+2.56%)	⬆️
src/core/base.cc	52.84% <0.00%> (+4.01%)	⬆️
src/server/master.cc	54.93% <0.00%> (+4.63%)	⬆️
src/os/timer.cc	83.33% <0.00%> (+4.76%)	⬆️

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