src/apps/installer/SemaphoreLocker.h

   1 /*
   2  * Copyright 2008-2009, Stephan Aßmus <superstippi@gmx.de>
   3  *  All rights reserved. Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _SEMAPHORE_LOCKER_H
   6 #define _SEMAPHORE_LOCKER_H
   7
   8
   9 #include "AutoLocker.h"
  10
  11
  12 class SemaphoreLocking {
  13 public:
  14         inline bool Lock(sem_id* lockable)
  15         {
  16                 return acquire_sem(*lockable) == B_OK;
  17         }
  18
  19         inline void Unlock(sem_id* lockable)
  20         {
  21                 release_sem(*lockable);
  22         }
  23 };
  24
  25
  26 class SemaphoreLocker : public AutoLocker<sem_id, SemaphoreLocking> {
  27 public:
  28         inline SemaphoreLocker(sem_id semaphore, bool alreadyLocked = false,
  29                         bool lockIfNotLocked = true)
  30                 :
  31                 AutoLocker<sem_id, SemaphoreLocking>(),
  32                 fSem(semaphore)
  33         {
  34                 SetTo(&fSem, alreadyLocked, lockIfNotLocked);
  35         }
  36
  37 private:
  38         sem_id  fSem;
  39 };
  40
  41 #endif // _SEMAPHORE_LOCKER_H