Function acquire_shared

src/borrow/shared.rs:45–57

(flags: *mut c_void, array: *mut PyArrayObject)

// These are the entry points which implement the shared borrow checking API:

unsafe extern "C" fn acquire_shared(flags: *mut c_void, array: *mut PyArrayObject) -> c_int {
    // SAFETY: must be attached when calling `acquire_shared`.
    let py = Python::assume_attached();
    let flags = &*(flags as *mut BorrowFlags);

    let address = base_address(py, array);
    let key = borrow_key(py, array);

    match flags.acquire(address, key) {
        Ok(()) => 0,
        Err(()) => -1,
    }
}

unsafe extern "C" fn acquire_mut_shared(flags: *mut c_void, array: *mut PyArrayObject) -> c_int {
    if (*array).flags & NPY_ARRAY_WRITEABLE == 0 {