70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
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// 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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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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#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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#if defined(OS_MACOSX)
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// Very large images or svg canvases can cause huge mallocs. Skia
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// does tricks on tcmalloc-based systems to allow malloc to fail with
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// a NULL rather than hit the oom crasher. This replicates that for
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// OSX.
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//
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// IF YOU USE THIS WITHOUT CONSULTING YOUR FRIENDLY OSX DEVELOPER,
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// YOUR CODE IS LIKELY TO BE REVERTED. THANK YOU.
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BASE_EXPORT void* UncheckedMalloc(size_t size);
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#endif // defined(OS_MACOSX)
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} // namespace base
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#endif // BASE_PROCESS_MEMORY_H_
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