Function hold_gil_for_test 

pub fn hold_gil_for_test(delay_secs: f64, hold_secs: f64)

Holds the GIL for the specified number of seconds without releasing it.

This is a test utility function that spawns a background thread which acquires the GIL using Rust’s Python::attach and holds it for the specified duration using thread::sleep. Unlike Python code which periodically releases the GIL, this function holds it continuously.

We intentionally use std::thread::sleep here (not Clock::sleep or async sleep) because the purpose is to simulate a blocking operation that holds the GIL without releasing it. Using an async sleep would release the GIL periodically, defeating the purpose of this test utility.

Args: delay_secs: Seconds to wait before acquiring the GIL hold_secs: Seconds to hold the GIL