kernel: simple allocationless event abstraction on top of poll

kernel-src/include/kernel/event.h

@@ -0,0 +1,25 @@
+#ifndef _EVENT_H
+#define _EVENT_H
+
+#include <kernel/poll.h>
+
+typedef pollheader_t eventheader_t;
+
+typedef struct {
+	polldesc_t polldesc;
+	polldata_t polldata;
+} eventlistener_t;
+
+#define EVENT_INITHEADER(e) POLL_INITHEADER(e)
+#define EVENT_INITLISTENER(e) { \
+		poll_initdesc(&(e)->polldesc, 0); \
+		(e)->polldesc.data = &(e)->polldata; \
+		(e)->polldata.desc = &(e)->polldesc; \
+	}
+
+#define EVENT_ATTACH(e, h) poll_add(h, &(e)->polldata, POLLPRI)
+#define EVENT_WAIT(e, t) poll_dowait(&(e)->polldesc, t)
+#define EVENT_SIGNAL(h) poll_event(h, POLLPRI)
+#define EVENT_DETACHALL(e) poll_leave(&(e)->polldesc)
+
+#endif