From bf09a5036ccfb77d2277247c66dc55daf41df3fe Mon Sep 17 00:00:00 2001 From: "license.bot" Date: Sun, 24 Aug 2008 00:55:55 +0000 Subject: Use a more compact license header in source files. git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1287 0039d316-1c4b-4281-b951-d872f2087c98 --- base/atomic_ref_count.h | 154 ++++++++++++++++++++---------------------------- 1 file changed, 65 insertions(+), 89 deletions(-) (limited to 'base/atomic_ref_count.h') diff --git a/base/atomic_ref_count.h b/base/atomic_ref_count.h index 84bd343..36690b5 100644 --- a/base/atomic_ref_count.h +++ b/base/atomic_ref_count.h @@ -1,89 +1,65 @@ -// Copyright 2008, Google Inc. -// All rights reserved. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// This is a low level implementation of atomic semantics for reference -// counting. Please use base/ref_counted.h directly instead. - -#ifndef BASE_ATOMIC_REF_COUNT_H_ -#define BASE_ATOMIC_REF_COUNT_H_ - -#include "base/atomicops.h" -#include "base/basictypes.h" - -namespace base { - -typedef base::subtle::Atomic32 AtomicRefCount; - -// Increment a reference count by "increment", which must exceed 0. -inline void AtomicRefCountIncN(volatile AtomicRefCount *ptr, - AtomicRefCount increment) { - base::subtle::NoBarrier_AtomicIncrement(ptr, increment); -} - -// Decrement a reference count by "decrement", which must exceed 0, -// and return whether the result is non-zero. -// Insert barriers to ensure that state written before the reference count -// became zero will be visible to a thread that has just made the count zero. -inline bool AtomicRefCountDecN(volatile AtomicRefCount *ptr, - AtomicRefCount decrement) { - return base::subtle::Barrier_AtomicIncrement(ptr, -decrement) != 0; -} - -// Increment a reference count by 1. -inline void AtomicRefCountInc(volatile AtomicRefCount *ptr) { - base::AtomicRefCountIncN(ptr, 1); -} - -// Decrement a reference count by 1 and return whether the result is non-zero. -// Insert barriers to ensure that state written before the reference count -// became zero will be visible to a thread that has just made the count zero. -inline bool AtomicRefCountDec(volatile AtomicRefCount *ptr) { - return base::AtomicRefCountDecN(ptr, 1); -} - -// Return whether the reference count is one. If the reference count is used -// in the conventional way, a refrerence count of 1 implies that the current -// thread owns the reference and no other thread shares it. This call performs -// the test for a reference count of one, and performs the memory barrier -// needed for the owning thread to act on the object, knowing that it has -// exclusive access to the object. -inline bool AtomicRefCountIsOne(volatile AtomicRefCount *ptr) { - return base::subtle::Acquire_Load(ptr) == 1; -} - -// Return whether the reference count is zero. With conventional object -// referencing counting, the object will be destroyed, so the reference count -// should never be zero. Hence this is generally used for a debug check. -inline bool AtomicRefCountIsZero(volatile AtomicRefCount *ptr) { - return base::subtle::Acquire_Load(ptr) == 0; -} - -} // namespace base - -#endif // BASE_ATOMIC_REF_COUNT_H_ +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// This is a low level implementation of atomic semantics for reference +// counting. Please use base/ref_counted.h directly instead. + +#ifndef BASE_ATOMIC_REF_COUNT_H_ +#define BASE_ATOMIC_REF_COUNT_H_ + +#include "base/atomicops.h" +#include "base/basictypes.h" + +namespace base { + +typedef base::subtle::Atomic32 AtomicRefCount; + +// Increment a reference count by "increment", which must exceed 0. +inline void AtomicRefCountIncN(volatile AtomicRefCount *ptr, + AtomicRefCount increment) { + base::subtle::NoBarrier_AtomicIncrement(ptr, increment); +} + +// Decrement a reference count by "decrement", which must exceed 0, +// and return whether the result is non-zero. +// Insert barriers to ensure that state written before the reference count +// became zero will be visible to a thread that has just made the count zero. +inline bool AtomicRefCountDecN(volatile AtomicRefCount *ptr, + AtomicRefCount decrement) { + return base::subtle::Barrier_AtomicIncrement(ptr, -decrement) != 0; +} + +// Increment a reference count by 1. +inline void AtomicRefCountInc(volatile AtomicRefCount *ptr) { + base::AtomicRefCountIncN(ptr, 1); +} + +// Decrement a reference count by 1 and return whether the result is non-zero. +// Insert barriers to ensure that state written before the reference count +// became zero will be visible to a thread that has just made the count zero. +inline bool AtomicRefCountDec(volatile AtomicRefCount *ptr) { + return base::AtomicRefCountDecN(ptr, 1); +} + +// Return whether the reference count is one. If the reference count is used +// in the conventional way, a refrerence count of 1 implies that the current +// thread owns the reference and no other thread shares it. This call performs +// the test for a reference count of one, and performs the memory barrier +// needed for the owning thread to act on the object, knowing that it has +// exclusive access to the object. +inline bool AtomicRefCountIsOne(volatile AtomicRefCount *ptr) { + return base::subtle::Acquire_Load(ptr) == 1; +} + +// Return whether the reference count is zero. With conventional object +// referencing counting, the object will be destroyed, so the reference count +// should never be zero. Hence this is generally used for a debug check. +inline bool AtomicRefCountIsZero(volatile AtomicRefCount *ptr) { + return base::subtle::Acquire_Load(ptr) == 0; +} + +} // namespace base + +#endif // BASE_ATOMIC_REF_COUNT_H_ + -- cgit v1.1