michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=8 sts=2 et sw=2 tw=80: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef mozilla_ChaosMode_h
michael@0: #define mozilla_ChaosMode_h
michael@0: 
michael@0: #include <stdint.h>
michael@0: #include <stdlib.h>
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: /**
michael@0:  * When "chaos mode" is activated, code that makes implicitly nondeterministic
michael@0:  * choices is encouraged to make random and extreme choices, to test more
michael@0:  * code paths and uncover bugs.
michael@0:  */
michael@0: class ChaosMode
michael@0: {
michael@0:   public:
michael@0:     static bool isActive()
michael@0:     {
michael@0:       // Flip this to true to activate chaos mode
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Returns a somewhat (but not uniformly) random uint32_t < aBound.
michael@0:      * Not to be used for anything except ChaosMode, since it's not very random.
michael@0:      */
michael@0:     static uint32_t randomUint32LessThan(uint32_t aBound)
michael@0:     {
michael@0:       return uint32_t(rand()) % aBound;
michael@0:     }
michael@0: };
michael@0: 
michael@0: } /* namespace mozilla */
michael@0: 
michael@0: #endif /* mozilla_ChaosMode_h */