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TOMOYO Linux Cross Reference
Linux/include/linux/eventpoll.h

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  1 /*
  2  *  include/linux/eventpoll.h ( Efficient event polling implementation )
  3  *  Copyright (C) 2001,...,2006  Davide Libenzi
  4  *
  5  *  This program is free software; you can redistribute it and/or modify
  6  *  it under the terms of the GNU General Public License as published by
  7  *  the Free Software Foundation; either version 2 of the License, or
  8  *  (at your option) any later version.
  9  *
 10  *  Davide Libenzi <davidel@xmailserver.org>
 11  *
 12  */
 13 #ifndef _LINUX_EVENTPOLL_H
 14 #define _LINUX_EVENTPOLL_H
 15 
 16 #include <uapi/linux/eventpoll.h>
 17 
 18 
 19 /* Forward declarations to avoid compiler errors */
 20 struct file;
 21 
 22 
 23 #ifdef CONFIG_EPOLL
 24 
 25 /* Used to initialize the epoll bits inside the "struct file" */
 26 static inline void eventpoll_init_file(struct file *file)
 27 {
 28         INIT_LIST_HEAD(&file->f_ep_links);
 29         INIT_LIST_HEAD(&file->f_tfile_llink);
 30 }
 31 
 32 
 33 /* Used to release the epoll bits inside the "struct file" */
 34 void eventpoll_release_file(struct file *file);
 35 
 36 /*
 37  * This is called from inside fs/file_table.c:__fput() to unlink files
 38  * from the eventpoll interface. We need to have this facility to cleanup
 39  * correctly files that are closed without being removed from the eventpoll
 40  * interface.
 41  */
 42 static inline void eventpoll_release(struct file *file)
 43 {
 44 
 45         /*
 46          * Fast check to avoid the get/release of the semaphore. Since
 47          * we're doing this outside the semaphore lock, it might return
 48          * false negatives, but we don't care. It'll help in 99.99% of cases
 49          * to avoid the semaphore lock. False positives simply cannot happen
 50          * because the file in on the way to be removed and nobody ( but
 51          * eventpoll ) has still a reference to this file.
 52          */
 53         if (likely(list_empty(&file->f_ep_links)))
 54                 return;
 55 
 56         /*
 57          * The file is being closed while it is still linked to an epoll
 58          * descriptor. We need to handle this by correctly unlinking it
 59          * from its containers.
 60          */
 61         eventpoll_release_file(file);
 62 }
 63 
 64 #else
 65 
 66 static inline void eventpoll_init_file(struct file *file) {}
 67 static inline void eventpoll_release(struct file *file) {}
 68 
 69 #endif
 70 
 71 #endif /* #ifndef _LINUX_EVENTPOLL_H */
 72 

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