Function has_active_backend_session 

pub fn has_active_backend_session() -> bool

Whether a portable backend-session closure is running on the current thread.

Hosts that enter through [with_session_entry_guard] (CUDA, WebGPU and backends keeping the default entry) set this flag for the duration of their session closure. An owner that serializes callers with a blocking lock must check it, together with its backend’s own admission state, before waiting on that lock: a thread holding a session must not wait on an owner another thread holds while that thread waits for the same session’s resources.

Examples

assert!(!tenferro_tensor::has_active_backend_session());
tenferro_tensor::with_session_entry_guard("doc", || {
    assert!(tenferro_tensor::has_active_backend_session());
})?;
assert!(!tenferro_tensor::has_active_backend_session());