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2864c2ae90
Summary: This is a follow-up to D25416. It removes all usages of TimeValue from llvm/Support library (except for the actual TimeValue declaration), and replaces them with appropriate usages of std::chrono. To facilitate this, I have added small utility functions for converting time points and durations into appropriate OS-specific types (FILETIME, struct timespec, ...). Reviewers: zturner, mehdi_amini Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D25730 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284966 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
//=- CachePruning.h - Helper to manage the pruning of a cache dir -*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements pruning of a directory intended for cache storage, using
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// various policies.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_CACHE_PRUNING_H
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#define LLVM_SUPPORT_CACHE_PRUNING_H
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#include "llvm/ADT/StringRef.h"
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#include <chrono>
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namespace llvm {
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/// Handle pruning a directory provided a path and some options to control what
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/// to prune.
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class CachePruning {
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public:
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/// Prepare to prune \p Path.
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CachePruning(StringRef Path) : Path(Path) {}
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/// Define the pruning interval. This is intended to be used to avoid scanning
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/// the directory too often. It does not impact the decision of which file to
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/// prune. A value of 0 forces the scan to occurs.
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CachePruning &setPruningInterval(std::chrono::seconds PruningInterval) {
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Interval = PruningInterval;
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return *this;
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}
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/// Define the expiration for a file. When a file hasn't been accessed for
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/// \p ExpireAfter seconds, it is removed from the cache. A value of 0 disable
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/// the expiration-based pruning.
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CachePruning &setEntryExpiration(std::chrono::seconds ExpireAfter) {
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Expiration = ExpireAfter;
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return *this;
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}
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/// Define the maximum size for the cache directory, in terms of percentage of
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/// the available space on the the disk. Set to 100 to indicate no limit, 50
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/// to indicate that the cache size will not be left over half the
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/// available disk space. A value over 100 will be reduced to 100. A value of
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/// 0 disable the size-based pruning.
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CachePruning &setMaxSize(unsigned Percentage) {
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PercentageOfAvailableSpace = std::min(100u, Percentage);
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return *this;
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}
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/// Peform pruning using the supplied options, returns true if pruning
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/// occured, i.e. if PruningInterval was expired.
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bool prune();
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private:
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// Options that matches the setters above.
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std::string Path;
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std::chrono::seconds Expiration;
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std::chrono::seconds Interval;
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unsigned PercentageOfAvailableSpace = 0;
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};
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} // namespace llvm
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#endif
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