MySQL Bugs: #92716: Reduce usage of THR

Bug #92716	Reduce usage of THR_MALLOC
Submitted:	9 Oct 2018 7:34	Modified:	10 Oct 2018 13:41
Reporter:	Jon Olav Hauglid	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: Compiling	Severity:	S3 (Non-critical)
Version:	8.0.15	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
THR_MALLOC is a MEM_ROOT double pointer allocated in thread local storage (TLS) that points to THD::mem_root.
We should reduce/remove usage of THR_MALLOC for two reasons:
1) It hides dependencies since TLS usage is not evident from argument lists etc.
2) Since the value depends on which thread is running, THR_MALLOC usage makes changing the threading model harder.

How to repeat:
n/a

Posted by developer:
 
Fixed in 8.0.15.

Code cleanup. No changelog entry needed.