Delete lock interface implementation from UmfpackLU

[fredrikekre]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.18%. Comparing base (d050b1b) to head (9063047).

Files with missing lines	Patch %	Lines
src/solvers/umfpack.jl	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #617      +/-   ##
==========================================
+ Coverage   84.10%   84.18%   +0.07%     
==========================================
  Files          12       12              
  Lines        9188     9179       -9     
==========================================
- Hits         7728     7727       -1     
+ Misses       1460     1452       -8     

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[SobhanMP]

I'm not critical of the patch, but why? IMHO, it's fair to warn people that they are waiting for locks to do sparse operations.

[fredrikekre]

The motivation wasn't really to remove the warning but rather that it is kind of weird that a struct UmfpackLU is lockable, it isn't an AbstractLock for example.

Regarding the warning, since it isn't really actionable by the user, and safe to ignore, it seems kind of pointless?

[ViralBShah]

I think it would make sense to document it rather than give a warning.

[SobhanMP]

The motivation wasn't really to remove the warning but rather that it is kind of weird that a struct UmfpackLU is lockable, it isn't an AbstractLock for example.

Makes sense

Regarding the warning, since it isn't really actionable by the user, and safe to ignore, it seems kind of pointless?

It is actionable, you can pass a different workspace.

I think it would make sense to document it rather than give a warning.

Nobody expects solve to lock. IMHO, it's better to create a new workspace than to lock w/o a warning.