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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
29 lines
712 B
C++
29 lines
712 B
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <stdint.h>
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namespace facebook {
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namespace eden {
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/**
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* Very efficiently returns a new uint64_t unique to this process. Amortizes
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* the cost of synchronizing threads across many ID allocations.
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*
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* All returned IDs are nonzero.
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*
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* TODO: It might be beneficial to add a parameter to request more than one
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* unique ID at a time, though such an API would make it possible to exhaust
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* the range of a 64-bit integer.
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*/
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uint64_t generateUniqueID() noexcept;
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} // namespace eden
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} // namespace facebook
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