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// Protocol Buffers - Google's data interchange format
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// Copyright 2023 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef PROTOBUF_HPB_EXTENSION_LOCK_H_
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#define PROTOBUF_HPB_EXTENSION_LOCK_H_
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#include <atomic>
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namespace hpb::internal {
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// TODO: Temporary locking api for cross-language
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// concurrency issue around extension api that uses lazy promotion
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// from unknown data to upb_MiniTableExtension. Will be replaced by
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// a core runtime solution in the future.
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//
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// Any api(s) using unknown or extension data (GetOrPromoteExtension,
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// Serialize and others) call lock/unlock to provide a way for
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// mixed language implementations to avoid race conditions)
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using UpbExtensionUnlocker = void (*)(const void*);
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using UpbExtensionLocker = UpbExtensionUnlocker (*)(const void*);
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// TODO: Expose as function instead of global.
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extern std::atomic<UpbExtensionLocker> upb_extension_locker_global;
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} // namespace hpb::internal
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#endif // PROTOBUF_HPB_EXTENSION_LOCK_H_
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