Function JxlResizableParallelRunnerCreate 

pub unsafe extern "C" fn JxlResizableParallelRunnerCreate(
    memory_manager: *const JxlMemoryManager,
) -> *mut c_void

Creates the runner for @ref JxlResizableParallelRunner. Use as the opaque runner. The runner will execute tasks on the calling thread until @ref JxlResizableParallelRunnerSetThreads is called.