No, Rust doesn't have semaphores in the stdlib[0] because it was not clear what precise semantics should be supported, or what purpose they would serve since by

No, Rust doesn't have semaphores in the stdlib[0] because it was not clear what precise semantics should be supported, or what purpose they would serve since by definition they can't mitigate exclusive and thus write access to a resource and mitigating access to code isn't much of a rust convention. And nobody has really championed their addition since. Furthermore, they still present a fair amount of design challenges in the specific context of Rust: https://neosmart.net/blog/implementing-truly-safe-semaphores-in-rust/ https://neosmart.net/blog/implementing-truly-safe-semaphores... [0] technically they were there, added in 0.4, never stabilised, deprecated in 1.7, and removed in 1.8