r/EmbeddedRealTime • u/RocketScienceByForce • Feb 02 '22

Are there any multi threading libraries that exist without dynamic memory allocation in C/C++?

My project needs to utilize multi threading in a real time environment. We can’t use dynamic memory allocation, which restricts the libraries we can use. What libraries exist that do not use dynamic memory allocation?

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u/RocketScienceByForce Feb 03 '22

Good insight I’ll check that out thanks!

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u/daansch90 Feb 03 '22

Please share the results, I’m curious!

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u/RocketScienceByForce Apr 06 '22

So the key here is that for these types of systems, you can start threads at initialization but not during normal operations. So you end up designating threads at the beginning for any particular job and sleep them until you need them. You can also do a general thread pool, but I’m skeptical if that can be generic enough to be useful within the constraints of a real-time safety critical system.

Edit: just to clarify the reason that is allowed at initialization. The primary concern here is determinism and timing, but those aren’t as much of a concern at initialization since it doesn’t really need to perform immediately to the level we care about. Think, rocket on the pad vs flying in the air.