feat: add clear_tasks()

[samangh]

@DeveloperPaul123 Firstly, thanks for this nice library. I'm glad that mentioned it on reddit. I was thinking of implementing my own thread pool, but you've definitely done a better job than I could have!

I think it would be useful to have a function for clearing all the tasks in the thread pool. This could be useful when, for example, one loads the thread pool with a list of tasks but then needs to clear them if an error/exception is thrown somewhere.

Note that this not fool-proof, for example a running task could add other tasks to the pool. Or alternatively, during the for loop, one thread (which just had it's task list cleared) could steal a thread from another task. But I didn't see a way of getting around these edge cases without adding another mutex

Of course, this is just one possible way of doing this. Please feel to do with the PR as you wish :-).

[DeveloperPaul123]

@samangh Hello! 👋 Thank you for the kind words and the PR! This is an interesting feature/use case and not something I had considered in the past.

It looks like the changes are simple, but I agree that this could cause some issues in practice with race conditions. At a minimum, for me to consider merging this PR, I would appreciate it if you could add some unit tests for the new feature. Both for the queue and the thread pool.

Thanks!

[samangh]

@DeveloperPaul123 Thanks for the reply. I've added unit tests to both the queue and the thread pool, I hope they make sense.

[DeveloperPaul123]

@samangh Looks like most of the CI builds are failing due to some warnings. Could you please address these?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.52%. Comparing base (cee2fce) to head (43d2d29).
Report is 25 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #69      +/-   ##
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+ Coverage   98.07%   98.52%   +0.45%     
==========================================
  Files           2        2              
  Lines         104      136      +32     
==========================================
+ Hits          102      134      +32     
  Misses          2        2              

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[samangh]

@DeveloperPaul123 Thanks for letting me know. I've fixed the tests, they should pass now.

[DeveloperPaul123]

Looks good to me! Nice work 👍