Function detach_thread

crates/vm/src/vm/thread.rs:187–209

()

/// Transition ATTACHED → DETACHED (like `_PyThreadState_Detach`).
#[cfg(all(unix, feature = "threading"))]
fn detach_thread() {
    CURRENT_THREAD_SLOT.with(|slot| {
        if let Some(s) = slot.borrow().as_ref() {
            match s.state.compare_exchange(
                THREAD_ATTACHED,
                THREAD_DETACHED,
                Ordering::AcqRel,
                Ordering::Acquire,
            ) {
                Ok(_) => {}
                Err(THREAD_DETACHED) => {
                    debug_assert!(false, "detach called while already DETACHED");
                    return;
                }
                Err(state) => {
                    debug_assert!(false, "unexpected thread state in detach: {state}");
                    return;
                }
            }
            super::stw_trace(format_args!("detach ATTACHED->DETACHED"));
        }
    });
}

/// Temporarily transition the current thread ATTACHED → DETACHED while
/// running `f`, then re-attach afterwards.  This allows `stop_the_world`