81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
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/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2006 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief Simple notifier for the observer/subject pattern (implementation)
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*
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* \author Bernie Innocenti <bernie@codewiz.org>
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*/
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#include "observer.h"
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#include <cpu/irq.h> // IRQ_DISABLE/IRQ_ENABLE
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void observer_SetEvent(Observer *observer, void (*event)(int event_id, void *param))
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{
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observer->event = event;
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}
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void observer_InitSubject(Subject *subject)
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{
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LIST_INIT(&subject->observers);
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}
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void observer_Subscribe(Subject *subject, Observer *observer)
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{
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ATOMIC(ADDHEAD(&subject->observers, &observer->link));
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}
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void observer_Unsubscribe(UNUSED_ARG(Subject *,subject), Observer *observer)
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{
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ATOMIC(REMOVE(&observer->link));
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}
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void observer_notify(Subject *subject, int event_id, void *param)
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{
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Observer *observer;
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cpu_flags_t irqstate;
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IRQ_SAVE_DISABLE(irqstate);
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/*
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* Run over list with protection against other
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* threads, but re-enable irqs in callbacks.
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*/
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FOREACH_NODE(observer, &subject->observers)
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{
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IRQ_RESTORE(irqstate);
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observer->event(event_id, param);
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IRQ_SAVE_DISABLE(irqstate);
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}
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IRQ_RESTORE(irqstate);
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}
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