Rust: What is the difference between sync::Arc and tokio::sync::Arc?

sync::Arc — atomic reference counting. tokio::sync::Arc — same (re-export).

sync::Arc:

• Atomic reference counting.
• Thread-safe.
• Standard library.

tokio::sync::Arc:

• Re-export of std::sync::Arc.
• Same functionality.
• For convenience.

1// Same thing
2let a = std::sync::Arc::new(5);
3let b = tokio::sync::Arc::new(5);

Key: Both are the same Arc.