Attempt to acquire a lock on this object. Return 0 on success, and a non‐zero value if this object is already locked by another thread, or if an error occurs. Succeed immediately if this thread already holds the lock.
Attempt to acquire a lock on this object. Return 0 on success, and a non‐zero value if this object is already locked by another thread, or if an error occurs. Succeed immediately if this thread already holds the lock.