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 <asm/mutex.h>
  15
  16 int alloc_event_buffer(void);
  17
  18 void 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  */
  25 void add_event_entry(unsigned long data);
  26
  27 /* wake up the process sleeping on the event file */
  28 void wake_up_buffer_waiter(void);
  29
  30 #define INVALID_COOKIE ~0UL
  31 #define NO_COOKIE 0UL
  32
  33 extern const struct file_operations event_buffer_fops;
  34
  35 /* mutex between sync_cpu_buffers() and the
  36  * file reading code.
  37  */
  38 extern struct mutex buffer_mutex;
  39
  40 #endif /* EVENT_BUFFER_H */