| Function silc_schedule_task_del_by_all
 
 SYNOPSIS
 
    SilcBool silc_schedule_task_del_by_all(SilcSchedule schedule, int fd,
                                           SilcTaskCallback callback,
                                           void *context);
DESCRIPTION
    Deletes a task from the scheduler by the specified `fd', `callback'
    and `context'.  Returns FALSE if such task does not exist.
    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.
 
 
 
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