src/system/kernel/vm/PageCacheLocker.h

   1 /*
   2  * Copyright 2007, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef PAGE_CACHE_LOCKER_H
   6 #define PAGE_CACHE_LOCKER_H
   7
   8
   9 #include <null.h>
  10
  11 struct vm_page;
  12
  13
  14 class PageCacheLocker {
  15 public:
  16         inline                                          PageCacheLocker(vm_page* page,
  17                                                                         bool dontWait = true);
  18         inline                                          ~PageCacheLocker();
  19
  20                         bool                            IsLocked() { return fPage != NULL; }
  21
  22                         bool                            Lock(vm_page* page, bool dontWait = true);
  23                         void                            Unlock();
  24
  25 private:
  26                         bool                            _IgnorePage(vm_page* page);
  27
  28                         vm_page*                        fPage;
  29 };
  30
  31
  32 PageCacheLocker::PageCacheLocker(vm_page* page, bool dontWait)
  33         :
  34         fPage(NULL)
  35 {
  36         Lock(page, dontWait);
  37 }
  38
  39
  40 PageCacheLocker::~PageCacheLocker()
  41 {
  42         Unlock();
  43 }
  44
  45
  46 #endif  // PAGE_CACHE_LOCKER_H