Function async_post_task 

pub unsafe extern "C" fn async_post_task(
    dispatcher: *mut async_dispatcher_t,
    task: *mut async_task_t,
) -> zx_status_t

Posts a task to run on or after its deadline following all posted tasks with lesser or equal deadlines.

The task’s handler will be invoked exactly once unless the task is canceled. When the dispatcher is shutting down (being destroyed), the handlers of all remaining tasks will be invoked with a status of |ZX_ERR_CANCELED|.

Dispatcher implementations must treat |ZX_TIME_INFINITE_PAST| as a sentinel value meaning “no deadline”. Tasks with expired deadlines must always be processed before tasks without deadlines (those posted with |ZX_TIME_INFINITE_PAST|).

Note: If there are always tasks with expired deadlines, tasks without deadlines may be starved.

Returns |ZX_OK| if the task was successfully posted. Returns |ZX_ERR_BAD_STATE| if the dispatcher is shutting down. Returns |ZX_ERR_NOT_SUPPORTED| if not supported by the dispatcher.

This operation is thread-safe.