mirror of
https://bitbucket.org/chromiumembedded/cef
synced 2025-06-05 21:39:12 +02:00
122397acfc
Changes to the CEF public API: - Add base::Bind, base::Callback, base::Lock, base::WeakPtr, scoped_refptr, scoped_ptr and supporting types. - Add include/wrapper/cef_closure_task.h helpers for converting a base::Closure to a CefTask. - Change CefRefPtr to extend scoped_refptr. -- Change CefBase method signatures to match RefCountedThreadSafeBase. - Change IMPLEMENT_REFCOUNTING to use base::AtomicRefCount*. -- Remove the CefAtomic* functions. -- IMPLEMENT_REFCOUNTING now enforces via a compile-time error that the correct class name was passed to the macro. - Change IMPLEMENT_LOCKING to use base::Lock. -- Remove the CefCriticalSection class. -- Deprecate the IMPLEMENT_LOCKING macro. -- base::Lock will DCHECK() in Debug builds if lock usage is reentrant. - Move include/internal/cef_tuple.h to include/base/cef_tuple.h. - Allow an empty |callback| parameter passed to CefBeginTracing. Changes to the CEF implementation: - Fix incorrect names passed to the IMPLEMENT_REFCOUNTING macro. - Fix instances of reentrant locking in the CefXmlObject and CefRequest implementations. - Remove use of the IMPLEMENT_LOCKING macro. Changes to cef_unittests: - Add tests/unittests/chromium_includes.h and always include it first from unit test .cc files to avoid name conflicts with Chromium types. - Fix wrong header include ordering. - Remove use of the IMPLEMENT_LOCKING macro. Changes to cefclient and cefsimple: - Use base::Bind and cef_closure_task.h instead of NewCefRunnable*. - Remove use of the IMPEMENT_LOCKING macro. - Fix incorrect/unnecessary locking. - Add additional runtime thread checks. - Windows: Perform actions on the UI thread instead of the main thread when running in multi-threaded-message-loop mode to avoid excessive locking. git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1769 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
199 lines
8.8 KiB
C++
199 lines
8.8 KiB
C++
// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2012
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// Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the name Chromium Embedded
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// Framework nor the names of its contributors may be used to endorse
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// or promote products derived from this software without specific prior
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// written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// For atomic operations on reference counts, see cef_atomic_ref_count.h.
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// The routines exported by this module are subtle. If you use them, even if
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// you get the code right, it will depend on careful reasoning about atomicity
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// and memory ordering; it will be less readable, and harder to maintain. If
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// you plan to use these routines, you should have a good reason, such as solid
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// evidence that performance would otherwise suffer, or there being no
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// alternative. You should assume only properties explicitly guaranteed by the
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// specifications in this file. You are almost certainly _not_ writing code
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// just for the x86; if you assume x86 semantics, x86 hardware bugs and
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// implementations on other archtectures will cause your code to break. If you
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// do not know what you are doing, avoid these routines, and use a Mutex.
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//
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// It is incorrect to make direct assignments to/from an atomic variable.
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// You should use one of the Load or Store routines. The NoBarrier
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// versions are provided when no barriers are needed:
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// NoBarrier_Store()
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// NoBarrier_Load()
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// Although there are currently no compiler enforcement, you are encouraged
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// to use these.
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//
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#ifndef CEF_INCLUDE_BASE_CEF_ATOMICOPS_H_
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#define CEF_INCLUDE_BASE_CEF_ATOMICOPS_H_
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#pragma once
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#if defined(BASE_ATOMICOPS_H_)
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// Do nothing if the Chromium header has already been included.
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// This can happen in cases where Chromium code is used directly by the
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// client application. When using Chromium code directly always include
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// the Chromium header first to avoid type conflicts.
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#elif defined(BUILDING_CEF_SHARED)
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// When building CEF include the Chromium header directly.
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#include "base/atomicops.h"
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#else // !BUILDING_CEF_SHARED
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// The following is substantially similar to the Chromium implementation.
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// If the Chromium implementation diverges the below implementation should be
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// updated to match.
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#include <stdint.h>
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#include "include/base/cef_build.h"
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#if defined(OS_WIN) && defined(ARCH_CPU_64_BITS)
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// windows.h #defines this (only on x64). This causes problems because the
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// public API also uses MemoryBarrier at the public name for this fence. So, on
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// X64, undef it, and call its documented
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// (http://msdn.microsoft.com/en-us/library/windows/desktop/ms684208.aspx)
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// implementation directly.
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#undef MemoryBarrier
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#endif
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namespace base {
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namespace subtle {
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typedef int32_t Atomic32;
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#ifdef ARCH_CPU_64_BITS
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// We need to be able to go between Atomic64 and AtomicWord implicitly. This
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// means Atomic64 and AtomicWord should be the same type on 64-bit.
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#if defined(__ILP32__) || defined(OS_NACL)
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// NaCl's intptr_t is not actually 64-bits on 64-bit!
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// http://code.google.com/p/nativeclient/issues/detail?id=1162
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typedef int64_t Atomic64;
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#else
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typedef intptr_t Atomic64;
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#endif
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#endif
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// Use AtomicWord for a machine-sized pointer. It will use the Atomic32 or
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// Atomic64 routines below, depending on your architecture.
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typedef intptr_t AtomicWord;
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// Atomically execute:
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// result = *ptr;
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// if (*ptr == old_value)
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// *ptr = new_value;
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// return result;
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//
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// I.e., replace "*ptr" with "new_value" if "*ptr" used to be "old_value".
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// Always return the old value of "*ptr"
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//
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// This routine implies no memory barriers.
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Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
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Atomic32 old_value,
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Atomic32 new_value);
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// Atomically store new_value into *ptr, returning the previous value held in
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// *ptr. This routine implies no memory barriers.
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Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, Atomic32 new_value);
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// Atomically increment *ptr by "increment". Returns the new value of
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// *ptr with the increment applied. This routine implies no memory barriers.
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Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, Atomic32 increment);
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Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
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Atomic32 increment);
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// These following lower-level operations are typically useful only to people
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// implementing higher-level synchronization operations like spinlocks,
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// mutexes, and condition-variables. They combine CompareAndSwap(), a load, or
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// a store with appropriate memory-ordering instructions. "Acquire" operations
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// ensure that no later memory access can be reordered ahead of the operation.
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// "Release" operations ensure that no previous memory access can be reordered
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// after the operation. "Barrier" operations have both "Acquire" and "Release"
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// semantics. A MemoryBarrier() has "Barrier" semantics, but does no memory
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// access.
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Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
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Atomic32 old_value,
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Atomic32 new_value);
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Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
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Atomic32 old_value,
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Atomic32 new_value);
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void MemoryBarrier();
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void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value);
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void Acquire_Store(volatile Atomic32* ptr, Atomic32 value);
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void Release_Store(volatile Atomic32* ptr, Atomic32 value);
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Atomic32 NoBarrier_Load(volatile const Atomic32* ptr);
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Atomic32 Acquire_Load(volatile const Atomic32* ptr);
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Atomic32 Release_Load(volatile const Atomic32* ptr);
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// 64-bit atomic operations (only available on 64-bit processors).
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#ifdef ARCH_CPU_64_BITS
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Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
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Atomic64 old_value,
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Atomic64 new_value);
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Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, Atomic64 new_value);
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Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, Atomic64 increment);
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Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, Atomic64 increment);
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Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
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Atomic64 old_value,
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Atomic64 new_value);
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Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
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Atomic64 old_value,
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Atomic64 new_value);
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void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value);
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void Acquire_Store(volatile Atomic64* ptr, Atomic64 value);
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void Release_Store(volatile Atomic64* ptr, Atomic64 value);
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Atomic64 NoBarrier_Load(volatile const Atomic64* ptr);
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Atomic64 Acquire_Load(volatile const Atomic64* ptr);
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Atomic64 Release_Load(volatile const Atomic64* ptr);
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#endif // ARCH_CPU_64_BITS
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} // namespace subtle
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} // namespace base
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// Include our platform specific implementation.
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#if defined(OS_WIN) && defined(COMPILER_MSVC) && defined(ARCH_CPU_X86_FAMILY)
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#include "include/base/internal/cef_atomicops_x86_msvc.h"
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#elif defined(OS_MACOSX)
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#include "include/base/internal/cef_atomicops_mac.h"
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#elif defined(COMPILER_GCC) && defined(ARCH_CPU_X86_FAMILY)
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#include "include/base/internal/cef_atomicops_x86_gcc.h"
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#else
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#error "Atomic operations are not supported on your platform"
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#endif
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// On some platforms we need additional declarations to make
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// AtomicWord compatible with our other Atomic* types.
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#if defined(OS_MACOSX) || defined(OS_OPENBSD)
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#include "include/base/internal/cef_atomicops_atomicword_compat.h"
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#endif
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#endif // !BUILDING_CEF_SHARED
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#endif // CEF_INCLUDE_BASE_CEF_ATOMICOPS_H_
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