Function vips_sys::vips_threadpool_run

pub unsafe extern "C" fn vips_threadpool_run(
    im: *mut VipsImage, 
    start: VipsThreadStartFn, 
    allocate: VipsThreadpoolAllocateFn, 
    work: VipsThreadpoolWorkFn, 
    progress: VipsThreadpoolProgressFn, 
    a: *mut c_void
) -> c_int