Thread Pool Theorizing

[copthesaint]

I'm trying to come up with a thread pool and this is the general idea:



The permissions will just be references of whatever variables past in some sort of list of void pointers.
I'm not sure if I am going about this in the right way, or the program would be faster just using mutex. but the idea is: As a job is being completed, it can free any permissions it no longer needs and continue executing.
I'm using this as a nice little project to get back into to programming since I haven't touched C since 2014...? I'll take any suggestions

https://lucid.app/lucidchart/11f22496-ecdc-40fa-b784-6fe1f8a51dbb/edit?invitationId=inv_ccbfec04-e796-4b88-8e56-12a388c0cca5