Differential D3143 Diff 14286 ps/trunk/libraries/source/spidermonkey/include-win32-debug/js/RefCounted.h
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ps/trunk/libraries/source/spidermonkey/include-win32-debug/js/RefCounted.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- | ||||
* vim: set ts=8 sts=4 et sw=4 tw=99: | * vim: set ts=8 sts=2 et sw=2 tw=80: | ||||
* This Source Code Form is subject to the terms of the Mozilla Public | * This Source Code Form is subject to the terms of the Mozilla Public | ||||
* License, v. 2.0. If a copy of the MPL was not distributed with this | * License, v. 2.0. If a copy of the MPL was not distributed with this | ||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | ||||
#ifndef js_RefCounted_h | #ifndef js_RefCounted_h | ||||
#define js_RefCounted_h | #define js_RefCounted_h | ||||
#include "mozilla/Atomics.h" | #include "mozilla/Atomics.h" | ||||
Show All 37 Lines | #endif | ||||
} | } | ||||
private: | private: | ||||
mutable MozRefCountType mRefCnt; | mutable MozRefCountType mRefCnt; | ||||
}; | }; | ||||
template <typename T> | template <typename T> | ||||
class AtomicRefCounted { | class AtomicRefCounted { | ||||
static const MozRefCountType DEAD = 0xffffdead; | // On 64-bit systems, if the refcount type is small (say, 32 bits), there's | ||||
// a risk that it could overflow. So require it to be large enough. | |||||
static_assert(sizeof(MozRefCountType) == sizeof(uintptr_t), | |||||
"You're at risk for ref count overflow."); | |||||
static const MozRefCountType DEAD = ~MozRefCountType(0xffff) | 0xdead; | |||||
protected: | protected: | ||||
AtomicRefCounted() : mRefCnt(0) {} | AtomicRefCounted() : mRefCnt(0) {} | ||||
~AtomicRefCounted() { MOZ_ASSERT(mRefCnt == DEAD); } | ~AtomicRefCounted() { MOZ_ASSERT(mRefCnt == DEAD); } | ||||
public: | public: | ||||
void AddRef() const { | void AddRef() const { | ||||
MOZ_ASSERT(int32_t(mRefCnt) >= 0); | |||||
++mRefCnt; | ++mRefCnt; | ||||
MOZ_ASSERT(mRefCnt != DEAD); | |||||
} | } | ||||
void Release() const { | void Release() const { | ||||
MOZ_ASSERT(int32_t(mRefCnt) > 0); | MOZ_ASSERT(mRefCnt != 0); | ||||
MozRefCountType cnt = --mRefCnt; | MozRefCountType cnt = --mRefCnt; | ||||
if (0 == cnt) { | if (0 == cnt) { | ||||
#ifdef DEBUG | #ifdef DEBUG | ||||
mRefCnt = DEAD; | mRefCnt = DEAD; | ||||
#endif | #endif | ||||
js_delete(const_cast<T*>(static_cast<const T*>(this))); | js_delete(const_cast<T*>(static_cast<const T*>(this))); | ||||
} | } | ||||
} | } | ||||
private: | private: | ||||
mutable mozilla::Atomic<MozRefCountType> mRefCnt; | mutable mozilla::Atomic<MozRefCountType> mRefCnt; | ||||
}; | }; | ||||
} // namespace js | } // namespace js | ||||
#endif /* js_RefCounted_h */ | #endif /* js_RefCounted_h */ |
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