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22 lines
729 B
C++
22 lines
729 B
C++
#pragma once
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#include "cache_loader.h"
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#include <optional.h>
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#include <mutex>
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#include <unordered_map>
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// Caches timestamps of cc files so we can avoid a filesystem reads. This is
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// important for import perf, as during dependency checking the same files are
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// checked over and over again if they are common headers.
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struct TimestampManager {
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optional<int64_t> GetLastCachedModificationTime(CacheLoader* cache_loader,
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const std::string& path);
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void UpdateCachedModificationTime(const std::string& path, int64_t timestamp);
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// TODO: use std::shared_mutex so we can have multiple readers.
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std::mutex mutex_;
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std::unordered_map<std::string, int64_t> timestamps_;
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}; |