Function suspend_if_needed

crates/vm/src/vm/thread.rs:247–267

(stw: &super::StopTheWorldState)

/// (like `_PyThreadState_Suspend` + `_PyThreadState_Attach`).
#[cfg(all(unix, feature = "threading"))]
pub fn suspend_if_needed(stw: &super::StopTheWorldState) {
    let should_suspend = CURRENT_THREAD_SLOT.with(|slot| {
        slot.borrow()
            .as_ref()
            .is_some_and(|s| s.stop_requested.load(Ordering::Relaxed))
    });
    if !should_suspend {
        return;
    }

    if !stw.requested.load(Ordering::Acquire) {
        CURRENT_THREAD_SLOT.with(|slot| {
            if let Some(s) = slot.borrow().as_ref() {
                s.stop_requested.store(false, Ordering::Release);
            }
        });
        return;
    }

    do_suspend(stw);
}

#[cfg(all(unix, feature = "threading"))]
#[cold]