Function fetch_global_var 

pub fn fetch_global_var<T>(key: &str) -> Result<&'static T, String>

Retrieves a reference to a global variable of type T stored with the given key.

Arguments

• key - The string key used to identify the global variable

Returns

• Ok(&'static T) - A static reference to the stored value if found
• Err(String) - Error message if mutex lock fails or key not found

Safety

This function contains unsafe code when dereferencing the stored pointer. Caller must ensure the type T matches the actual stored type.