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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /security/sandbox/chromium/base/atomic_sequence_num.h | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'security/sandbox/chromium/base/atomic_sequence_num.h')
-rw-r--r-- | security/sandbox/chromium/base/atomic_sequence_num.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/security/sandbox/chromium/base/atomic_sequence_num.h b/security/sandbox/chromium/base/atomic_sequence_num.h new file mode 100644 index 0000000000..717e37a60b --- /dev/null +++ b/security/sandbox/chromium/base/atomic_sequence_num.h @@ -0,0 +1,33 @@ +// Copyright (c) 2012 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. + +#ifndef BASE_ATOMIC_SEQUENCE_NUM_H_ +#define BASE_ATOMIC_SEQUENCE_NUM_H_ + +#include <atomic> + +#include "base/macros.h" + +namespace base { + +// AtomicSequenceNumber is a thread safe increasing sequence number generator. +// Its constructor doesn't emit a static initializer, so it's safe to use as a +// global variable or static member. +class AtomicSequenceNumber { + public: + constexpr AtomicSequenceNumber() = default; + + // Returns an increasing sequence number starts from 0 for each call. + // This function can be called from any thread without data race. + inline int GetNext() { return seq_.fetch_add(1, std::memory_order_relaxed); } + + private: + std::atomic_int seq_{0}; + + DISALLOW_COPY_AND_ASSIGN(AtomicSequenceNumber); +}; + +} // namespace base + +#endif // BASE_ATOMIC_SEQUENCE_NUM_H_ |