Function hyper_task_set_userdata 

#[unsafe(no_mangle)]
pub extern "C" fn hyper_task_set_userdata(
    task: *mut hyper_task,
    userdata: *mut c_void,
)

Available on crate feature ffi and hyper_unstable_ffi only.

Set a user data pointer to be associated with this task.

This value will be passed to task callbacks, and can be checked later with hyper_task_userdata.

This is useful for telling apart tasks for different requests that are running on the same executor.