forked from mirrors/gecko-dev
f3b8c9b60a
Caching filenames in 32-entry LRU array covers >95% of calls, and makes the average `Filename()` call 5 to 10 times cheaper. browser_start_content_mainthreadio.js needed to be updated to handle operations that now have a filename thanks to the cache. Since `ClearPoisonIOInterposer()` is never called (see bug 1647107), during Firefox shutdown we put LRUCache in a shutdown mode, which bypasses the cache in case it is still used at that time. Differential Revision: https://phabricator.services.mozilla.com/D79767
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_PoisonIOInterposer_h
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#define mozilla_PoisonIOInterposer_h
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#include "mozilla/Types.h"
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#include <stdio.h>
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MOZ_BEGIN_EXTERN_C
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/** Register file handle to be ignored by poisoning IO interposer. This function
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* and the corresponding UnRegister function are necessary for exchange of
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* handles between binaries not using the same CRT on Windows (which happens
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* when one of them links the static CRT). In such cases, giving file
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* descriptors or FILEs
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* doesn't work because _get_osfhandle fails with "invalid parameter". */
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void MozillaRegisterDebugHandle(intptr_t aHandle);
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/** Register file descriptor to be ignored by poisoning IO interposer */
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void MozillaRegisterDebugFD(int aFd);
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/** Register file to be ignored by poisoning IO interposer */
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void MozillaRegisterDebugFILE(FILE* aFile);
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/** Unregister file handle from being ignored by poisoning IO interposer */
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void MozillaUnRegisterDebugHandle(intptr_t aHandle);
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/** Unregister file descriptor from being ignored by poisoning IO interposer */
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void MozillaUnRegisterDebugFD(int aFd);
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/** Unregister file from being ignored by poisoning IO interposer */
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void MozillaUnRegisterDebugFILE(FILE* aFile);
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MOZ_END_EXTERN_C
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#if defined(XP_MACOSX) || defined(XP_WIN)
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# ifdef __cplusplus
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namespace mozilla {
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/**
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* Check if a file is registered as a debug file.
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*/
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bool IsDebugFile(intptr_t aFileID);
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/**
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* Initialize IO poisoning, this is only safe to do on the main-thread when no
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* other threads are running.
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*
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* Please, note that this probably has performance implications as all
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*/
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void InitPoisonIOInterposer();
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# ifdef XP_MACOSX
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/**
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* Check that writes are dirty before reporting I/O (Mac OS X only)
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* This is necessary for late-write checks on Mac OS X, but reading the buffer
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* from file to see if we're writing dirty bits is expensive, so we don't want
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* to do this for everything else that uses
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*/
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void OnlyReportDirtyWrites();
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# endif /* XP_MACOSX */
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/**
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* Clear IO poisoning, this is only safe to do on the main-thread when no other
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* threads are running.
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* Never called! See bug 1647107.
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*/
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void ClearPoisonIOInterposer();
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} // namespace mozilla
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# endif /* __cplusplus */
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#else /* defined(XP_MACOSX) || defined(XP_WIN) */
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# ifdef __cplusplus
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namespace mozilla {
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inline bool IsDebugFile(intptr_t aFileID) { return true; }
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inline void InitPoisonIOInterposer() {}
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inline void ClearPoisonIOInterposer() {}
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# ifdef XP_MACOSX
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inline void OnlyReportDirtyWrites() {}
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# endif /* XP_MACOSX */
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} // namespace mozilla
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# endif /* __cplusplus */
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#endif /* XP_WIN || XP_MACOSX */
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#endif // mozilla_PoisonIOInterposer_h
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