Security/libsecurity_utilities/lib/vproc++.h

   1 /*
   2  * Copyright (c) 2008,2011 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 //
  26 // vproc++ - interface to low-level transaction tracking facility
  27 //
  28 #ifndef _H_VPROCPP
  29 #define _H_VPROCPP
  30
  31 #include <vproc.h>
  32
  33
  34 namespace Security {
  35 namespace VProc {
  36
  37
  38 class Transaction {
  39 public:
  40         Transaction(vproc_t vp = 0) : mVP(vp) { mTransaction = ::vproc_transaction_begin(vp); }
  41         Transaction(bool activate, vproc_t vp = 0) : mVP(vp)
  42                 { if (activate) mTransaction = ::vproc_transaction_begin(vp); else mTransaction = 0; }
  43         ~Transaction() { deactivate(); }
  44
  45         // explicit state management
  46         void activate();
  47         void deactivate()
  48                 { if (mTransaction) { ::vproc_transaction_end(mVP, mTransaction); mTransaction = 0; }}
  49         bool active() const { return mTransaction != 0; }
  50
  51         static size_t debugCount();                             // debug use only
  52
  53 private:
  54         vproc_t mVP;
  55         vproc_transaction_t mTransaction;
  56 };
  57
  58
  59 }       // end namespace VProc
  60 }       // end namespace Security
  61
  62
  63 #endif //_H_VPROCPP