Function file_guard::try_lock

pub fn try_lock<T: Deref<Target = File>>(
    file: T, 
    lock: Lock, 
    offset: usize, 
    len: usize
) -> Result<FileGuard<T>>

Attempt to claim the desired Lock type using a byte range of a file.

If the desired Lock type cannot be obtained without blocking, an Error of kind ErrorKind::WouldBlock is returned. Otherwise if successful, the lock is held.

The byte range does not need to exist in the underlying file.