Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_utilities / lib / vproc++.h

diff --git a/Security/libsecurity_utilities/lib/vproc++.h b/Security/libsecurity_utilities/lib/vproc++.h
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+/*
+ * Copyright (c) 2008,2011 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+//
+// vproc++ - interface to low-level transaction tracking facility
+//
+#ifndef _H_VPROCPP
+#define _H_VPROCPP
+
+#include <vproc.h>
+
+
+namespace Security {
+namespace VProc {
+
+
+class Transaction {
+public:
+       Transaction(vproc_t vp = 0) : mVP(vp) { mTransaction = ::vproc_transaction_begin(vp); }
+       Transaction(bool activate, vproc_t vp = 0) : mVP(vp)
+               { if (activate) mTransaction = ::vproc_transaction_begin(vp); else mTransaction = 0; }
+       ~Transaction() { deactivate(); }
+       
+       // explicit state management
+       void activate();
+       void deactivate()
+               { if (mTransaction) { ::vproc_transaction_end(mVP, mTransaction); mTransaction = 0; }}
+       bool active() const { return mTransaction != 0; }
+       
+       static size_t debugCount();                             // debug use only
+       
+private:
+       vproc_t mVP;
+       vproc_transaction_t mTransaction;
+};
+
+
+}      // end namespace VProc
+}      // end namespace Security
+
+
+#endif //_H_VPROCPP