fix concurrent safety for package gdb

[gqcn]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1998 (e78a1f8) into master (3e7e8ba) will increase coverage by 0.00%.
The diff coverage is 38.88%.

@@           Coverage Diff           @@
##           master    #1998   +/-   ##
=======================================
  Coverage   76.48%   76.48%           
=======================================
  Files         512      512           
  Lines       46651    46646    -5     
=======================================
- Hits        35679    35678    -1     
+ Misses       9000     8998    -2     
+ Partials     1972     1970    -2     

Flag	Coverage Δ
go-1.15-386	76.39% <38.88%> (-0.01%)	⬇️
go-1.15-amd64	76.39% <38.88%> (-0.01%)	⬇️
go-1.16-386	76.38% <38.88%> (-0.01%)	⬇️
go-1.16-amd64	76.40% <38.88%> (+<0.01%)	⬆️
go-1.17-386	76.43% <38.88%> (+0.03%)	⬆️
go-1.17-amd64	76.42% <38.88%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
database/gdb/gdb.go	66.83% <38.88%> (+0.67%)	⬆️
os/gcron/gcron_schedule.go	70.42% <0.00%> (-1.17%)	⬇️
os/gcache/gcache_adapter_memory_lru.go	97.91% <0.00%> (+8.33%)	⬆️

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