kernel: poll system and poll syscall

kernel-src/include/kernel/poll.h

@@ -0,0 +1,43 @@
+#ifndef _POLL_H
+#define _POLL_H
+
+#include <kernel/scheduler.h>
+#include <spinlock.h>
+#include <mutex.h>
+
+struct polldata;
+
+typedef struct {
+	thread_t *thread;
+	spinlock_t lock;
+	mutex_t eventlock;
+	struct polldata *data;
+	struct polldata *event;
+	size_t size;
+} polldesc_t;
+
+typedef struct {
+	mutex_t lock;
+	struct polldata *data;
+} pollheader_t;
+
+typedef struct polldata {
+	struct polldata *next;
+	struct polldata *prev;
+	pollheader_t *header;
+	polldesc_t *desc;
+	int events;
+	int revents;
+} polldata_t;
+
+#define POLL_INITHEADER(x) \
+	MUTEX_INIT(&(x)->lock);
+
+int poll_initdesc(polldesc_t *, size_t size);
+void poll_add(pollheader_t *, polldata_t *, int events);
+void poll_leave(polldesc_t *);
+int poll_dowait(polldesc_t *);
+void poll_event(pollheader_t *, int events);
+void poll_destroydesc(polldesc_t *);
+
+#endif