12bc53e031
-- c99f979ad34f155fbeeea69b88bdc7458d89a21c by Derek Mauro <dmauro@google.com>: Remove a floating point division by zero test. This isn't testing behavior related to the library, and MSVC warns about it in opt mode. PiperOrigin-RevId: 285220804 -- 68b015491f0dbf1ab547994673281abd1f34cd4b by Gennadiy Rozental <rogeeff@google.com>: This CL introduces following changes to the class FlagImpl: * We eliminate the CommandLineFlagLocks struct. Instead callback guard and callback function are combined into a single CallbackData struct, while primary data lock is stored separately. * CallbackData member of class FlagImpl is initially set to be nullptr and is only allocated and initialized when a flag's callback is being set. For most flags we do not pay for the extra space and extra absl::Mutex now. * Primary data guard is stored in data_guard_ data member. This is a properly aligned character buffer of necessary size. During initialization of the flag we construct absl::Mutex in this space using placement new call. * We now avoid extra value copy after successful attempt to parse value out of string. Instead we swap flag's current value with tentative value we just produced. PiperOrigin-RevId: 285132636 -- ed45d118fb818969eb13094cf7827c885dfc562c by Tom Manshreck <shreck@google.com>: Change null-term* (and nul-term*) to NUL-term* in comments PiperOrigin-RevId: 285036610 -- 729619017944db895ce8d6d29c1995aa2e5628a5 by Derek Mauro <dmauro@google.com>: Use the Posix implementation of thread identity on MinGW. Some versions of MinGW suffer from thread_local bugs. PiperOrigin-RevId: 285022920 -- 39a25493503c76885bc3254c28f66a251c5b5bb0 by Greg Falcon <gfalcon@google.com>: Implementation detail change. Add further ABSL_NAMESPACE_BEGIN and _END annotation macros to files in Abseil. PiperOrigin-RevId: 285012012 GitOrigin-RevId: c99f979ad34f155fbeeea69b88bdc7458d89a21c Change-Id: I4c85d3704e45d11a9ac50d562f39640a6adbedc1
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
/*
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* Copyright 2017 The Abseil Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Interface for getting the current ThreadIdentity, creating one if necessary.
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// See thread_identity.h.
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//
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// This file is separate from thread_identity.h because creating a new
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// ThreadIdentity requires slightly higher level libraries (per_thread_sem
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// and low_level_alloc) than accessing an existing one. This separation allows
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// us to have a smaller //absl/base:base.
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#ifndef ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
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#define ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
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#include "absl/base/internal/thread_identity.h"
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#include "absl/base/port.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace synchronization_internal {
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// Allocates and attaches a ThreadIdentity object for the calling thread.
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// For private use only.
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base_internal::ThreadIdentity* CreateThreadIdentity();
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// A per-thread destructor for reclaiming associated ThreadIdentity objects.
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// For private use only.
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void ReclaimThreadIdentity(void* v);
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// Returns the ThreadIdentity object representing the calling thread; guaranteed
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// to be unique for its lifetime. The returned object will remain valid for the
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// program's lifetime; although it may be re-assigned to a subsequent thread.
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// If one does not exist for the calling thread, allocate it now.
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inline base_internal::ThreadIdentity* GetOrCreateCurrentThreadIdentity() {
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base_internal::ThreadIdentity* identity =
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base_internal::CurrentThreadIdentityIfPresent();
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if (ABSL_PREDICT_FALSE(identity == nullptr)) {
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return CreateThreadIdentity();
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}
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return identity;
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}
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} // namespace synchronization_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
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