| Function SilcTaskNotifyCb
 
 SYNOPSIS
 
    typedef void (*SilcTaskNotifyCb)(SilcSchedule schedule,
                                     SilcBool added, SilcTask task,
                                     SilcBool fd_task, SilcUInt32 fd,
                                     SilcTaskEvent event,
                                     long seconds, long useconds,
                                     void *context);
DESCRIPTION
    Task notify callback.  Callback of this type can be set to scheduler
    by calling silc_schedule_set_notify and will be called whenever new
    task is added or old task is removed.  If `added' is TRUE then `task'
    is added to scheduler.  If `added' is FALSE then `task' will be removed
    from the scheduler.  If `fd_task' is TRUE the `task' is file descriptor
    task and has `fd' is its file descriptor.  If `fd_task' is FALSE then
    the task is timeout task and `seconds' and `useconds' specify the
    timeout.  The `context' is the context given to silc_schedule_set_notify.
NOTES
    The `schedule' is locked while this callback is called.  This means that
    new tasks cannot be added or removed inside this callback.
    When timeout task expires this callback is not called.  This is called
    only when task is explicitly deleted from the scheduler.  Note that,
    when timeout task expires it is removed from the scheduler and `task'
    will become invalid.
    If fd task changes its events, this will be called as if it was a new
    task with different `event' mask.
 
 
 
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