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87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PROCESS_MEMORY_H_
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#define BASE_PROCESS_MEMORY_H_
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/process/process_handle.h"
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#include "build/build_config.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#endif
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#ifdef PVALLOC_AVAILABLE
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// Build config explicitly tells us whether or not pvalloc is available.
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#elif defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
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#define PVALLOC_AVAILABLE 1
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#else
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#define PVALLOC_AVAILABLE 0
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#endif
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namespace base {
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// Enables low fragmentation heap (LFH) for every heaps of this process. This
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// won't have any effect on heaps created after this function call. It will not
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// modify data allocated in the heaps before calling this function. So it is
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// better to call this function early in initialization and again before
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// entering the main loop.
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// Note: Returns true on Windows 2000 without doing anything.
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BASE_EXPORT bool EnableLowFragmentationHeap();
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// Enables 'terminate on heap corruption' flag. Helps protect against heap
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// overflow. Has no effect if the OS doesn't provide the necessary facility.
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BASE_EXPORT void EnableTerminationOnHeapCorruption();
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// Turns on process termination if memory runs out.
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BASE_EXPORT void EnableTerminationOnOutOfMemory();
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// Terminates process. Should be called only for out of memory errors.
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// Crash reporting classifies such crashes as OOM.
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BASE_EXPORT void TerminateBecauseOutOfMemory(size_t size);
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#if defined(OS_WIN)
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// Returns the module handle to which an address belongs. The reference count
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// of the module is not incremented.
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BASE_EXPORT HMODULE GetModuleFromAddress(void* address);
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#endif
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#if defined(OS_LINUX) || defined(OS_ANDROID)
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BASE_EXPORT extern size_t g_oom_size;
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// The maximum allowed value for the OOM score.
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const int kMaxOomScore = 1000;
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// This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will
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// prefer to kill certain process types over others. The range for the
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// adjustment is [-1000, 1000], with [0, 1000] being user accessible.
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// If the Linux system doesn't support the newer oom_score_adj range
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// of [0, 1000], then we revert to using the older oom_adj, and
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// translate the given value into [0, 15]. Some aliasing of values
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// may occur in that case, of course.
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BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score);
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#endif
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// Special allocator functions for callers that want to check for OOM.
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// These will not abort if the allocation fails even if
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// EnableTerminationOnOutOfMemory has been called.
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// This can be useful for huge and/or unpredictable size memory allocations.
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// Please only use this if you really handle the case when the allocation
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// fails. Doing otherwise would risk security.
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// These functions may still crash on OOM when running under memory tools,
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// specifically ASan and other sanitizers.
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// Return value tells whether the allocation succeeded. If it fails |result| is
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// set to NULL, otherwise it holds the memory address.
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BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size,
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void** result);
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BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedCalloc(size_t num_items,
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size_t size,
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void** result);
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} // namespace base
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#endif // BASE_PROCESS_MEMORY_H_
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