Is the Struct std::sync::mpsc::Sender thread-safe?

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The official docs not said.

channel in std::sync::mpsc - Rust (rust-lang.org)
Sender in std::sync::mpsc - Rust (rust-lang.org)

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You can generally rely on Send and Sync being either implemented or not to be the marker of different kinds of thread-safety, unless documentation states otherwise. Sender is both Send and Sync, so unless standard library has a soundness bug, Sender must be thread-safe.

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Implementing Send indicates that it's safe to pass this type between threads (but says nothing about having access to it from two threads at once).

Implementing Sync says that it's safe to have access to this type from two threads simultaneously.

Unless there's a bug in the implementation (in which case, report an issue to get it fixed), you can assume that a type that has implementations of both Send and Sync is thread-safe.

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