kernel: add header files

include/kernel/ringbuffer.h

@@ -0,0 +1,34 @@
+#ifndef KERNEL_RINGBUFFER_H_
+#define KERNEL_RINGBUFFER_H_
+
+#include <kernel/locks.h>
+#include <kernel/sched.h>
+
+struct ringbuffer {
+	unsigned char *r_buffer;
+	size_t r_write_ptr;
+	size_t r_read_ptr;
+	size_t r_size;
+	spin_lock_t r_lock;
+	struct waitqueue r_wait_readers;
+	struct waitqueue r_wait_writers;
+};
+
+extern struct ringbuffer *ringbuffer_create(size_t size);
+extern void ringbuffer_destroy(struct ringbuffer *buf);
+
+extern kern_status_t ringbuffer_init(struct ringbuffer *buf, size_t size);
+extern kern_status_t ringbuffer_deinit(struct ringbuffer *buf);
+
+extern size_t ringbuffer_unread(struct ringbuffer *buf);
+extern size_t ringbuffer_avail(struct ringbuffer *buf);
+extern size_t ringbuffer_read(struct ringbuffer *buf, size_t size, void *buffer, mango_flags_t flags);
+extern size_t ringbuffer_write(struct ringbuffer *buf, size_t size, const void *buffer, mango_flags_t flags);
+
+/* TODO */
+//extern size_t ringbuffer_peek(struct ringbuffer *buf, size_t at, size_t size, void *buffer);
+//extern size_t ringbuffer_skip(struct ringbuffer *buf, size_t count);
+
+extern int ringbuffer_write_would_block(struct ringbuffer *buf);
+
+#endif