Root/drivers/oprofile/event_buffer.h

1/**
2 * @file event_buffer.h
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author John Levon <levon@movementarian.org>
8 */
9
10#ifndef EVENT_BUFFER_H
11#define EVENT_BUFFER_H
12
13#include <linux/types.h>
14#include <linux/mutex.h>
15
16int alloc_event_buffer(void);
17
18void free_event_buffer(void);
19
20/**
21 * Add data to the event buffer.
22 * The data passed is free-form, but typically consists of
23 * file offsets, dcookies, context information, and ESCAPE codes.
24 */
25void add_event_entry(unsigned long data);
26
27/* wake up the process sleeping on the event file */
28void wake_up_buffer_waiter(void);
29
30#define INVALID_COOKIE ~0UL
31#define NO_COOKIE 0UL
32
33extern const struct file_operations event_buffer_fops;
34
35/* mutex between sync_cpu_buffers() and the
36 * file reading code.
37 */
38extern struct mutex buffer_mutex;
39
40#endif /* EVENT_BUFFER_H */
41

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