4 * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
5 * This file is part of DevLib - See README.devlib for information.
8 * \brief Simple notifier for the observer/subject pattern (implementation)
11 * \author Bernardo Innocenti <bernie@develer.com>
15 #include <cfg/cpu.h> // IRQ_DISABLE/IRQ_ENABLE
18 void observer_SetEvent(Observer *observer, void (*event)(int event_id, void *param))
20 observer->event = event;
23 void observer_InitSubject(Subject *subject)
25 LIST_INIT(&subject->observers);
28 void observer_Subscribe(Subject *subject, Observer *observer)
30 ATOMIC(ADDHEAD(&subject->observers, &observer->link));
33 void observer_Unsubscribe(UNUSED_ARG(Subject *,subject), Observer *observer)
35 ATOMIC(REMOVE(&observer->link));
38 void observer_notify(Subject *subject, int event_id, void *param)
42 IRQ_SAVE_DISABLE(irqstate);
45 * Run over list with protection against other
46 * threads, but re-enable irqs in callbacks.
48 FOREACH_NODE(observer, &subject->observers)
50 IRQ_RESTORE(irqstate);
51 observer->event(event_id, param);
52 IRQ_SAVE_DISABLE(irqstate);
55 IRQ_RESTORE(irqstate);