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0ec5439ada
It appears that a potential race between the cache client and the cache pruner that I thought was unlikely actually happened in practice [1]. Try to avoid the race condition by opening the temporary file before renaming it. Do this only on non-Windows platforms because we cannot rename open files on Windows using the sys::fs::rename function. [1] https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.memory%2FLinux_CFI%2F1610%2F%2B%2Frecipes%2Fsteps%2Fcompile%2F0%2Fstdout Differential Revision: https://reviews.llvm.org/D37410 llvm-svn: 312567
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
//===- Caching.h - LLVM Link Time Optimizer Configuration -----------------===//
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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 defines the localCache function, which allows clients to add a
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// filesystem cache to ThinLTO.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LTO_CACHING_H
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#define LLVM_LTO_CACHING_H
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#include "llvm/LTO/LTO.h"
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#include <string>
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namespace llvm {
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namespace lto {
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/// This type defines the callback to add a pre-existing native object file
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/// (e.g. in a cache).
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///
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/// Path is generally expected to be a valid path for the file at the point when
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/// the AddBufferFn function is called, but clients should prefer to access MB
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/// directly in order to avoid a potential race condition.
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///
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/// Buffer callbacks must be thread safe.
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typedef std::function<void(unsigned Task, std::unique_ptr<MemoryBuffer> MB,
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StringRef Path)>
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AddBufferFn;
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/// Create a local file system cache which uses the given cache directory and
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/// file callback. This function also creates the cache directory if it does not
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/// already exist.
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Expected<NativeObjectCache> localCache(StringRef CacheDirectoryPath,
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AddBufferFn AddBuffer);
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} // namespace lto
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} // namespace llvm
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#endif
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