void silc_schedule_task_del_by_fd(SilcSchedule schedule, SilcUInt32 fd);

    Deletes a task from the scheduler by the specified `fd'.

    It is safe to call this function in any place. Tasks may be removed
    in task callbacks (including in the task's own task callback) and
    in multi-threaded environment in other threads as well.

    Note that generic tasks cannot be deleted using this function
    since generic tasks does not match any specific fd.