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63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
// Copyright 2021 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// WARNING: *DO NOT* use this class directly. base::PlatformThreadRef is a
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// low-level platform-specific abstraction to the OS's threading interface.
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// Instead, consider using a message-loop driven base::Thread, see
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// base/threading/thread.h.
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#ifndef BASE_THREADING_PLATFORM_THREAD_REF_H_
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#define BASE_THREADING_PLATFORM_THREAD_REF_H_
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#include <iosfwd>
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#include "base/base_export.h"
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#include "build/build_config.h"
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#if BUILDFLAG(IS_WIN)
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#include "base/win/windows_types.h"
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#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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#include <pthread.h>
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#endif
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namespace base {
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// Used for thread checking and debugging.
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// Meant to be as fast as possible.
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// These are produced by PlatformThread::CurrentRef(), and used to later
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// check if we are on the same thread or not by using ==. These are safe
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// to copy between threads, but can't be copied to another process as they
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// have no meaning there. Also, the internal identifier can be re-used
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// after a thread dies, so a PlatformThreadRef cannot be reliably used
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// to distinguish a new thread from an old, dead thread.
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class PlatformThreadRef {
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public:
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#if BUILDFLAG(IS_WIN)
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using RefType = DWORD;
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#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
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using RefType = pthread_t;
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#endif
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constexpr PlatformThreadRef() = default;
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explicit constexpr PlatformThreadRef(RefType id) : id_(id) {}
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bool operator==(PlatformThreadRef other) const { return id_ == other.id_; }
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bool operator!=(PlatformThreadRef other) const { return id_ != other.id_; }
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bool is_null() const { return id_ == 0; }
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private:
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friend BASE_EXPORT std::ostream& operator<<(std::ostream& os,
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const PlatformThreadRef& ref);
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RefType id_ = 0;
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};
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BASE_EXPORT std::ostream& operator<<(std::ostream& os,
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const PlatformThreadRef& ref);
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} // namespace base
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#endif // BASE_THREADING_PLATFORM_THREAD_REF_H_
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