| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_PROCESS_MEMORY_H_ |
| #define BASE_PROCESS_MEMORY_H_ |
| |
| #include "base/base_export.h" |
| #include "base/basictypes.h" |
| #include "base/process/process_handle.h" |
| #include "build/build_config.h" |
| |
| #if defined(OS_WIN) |
| #include <windows.h> |
| #endif |
| |
| #ifdef PVALLOC_AVAILABLE |
| // Build config explicitly tells us whether or not pvalloc is available. |
| #elif defined(LIBC_GLIBC) && !defined(USE_TCMALLOC) |
| #define PVALLOC_AVAILABLE 1 |
| #else |
| #define PVALLOC_AVAILABLE 0 |
| #endif |
| |
| namespace base { |
| |
| // Enables low fragmentation heap (LFH) for every heaps of this process. This |
| // won't have any effect on heaps created after this function call. It will not |
| // modify data allocated in the heaps before calling this function. So it is |
| // better to call this function early in initialization and again before |
| // entering the main loop. |
| // Note: Returns true on Windows 2000 without doing anything. |
| BASE_EXPORT bool EnableLowFragmentationHeap(); |
| |
| // Enables 'terminate on heap corruption' flag. Helps protect against heap |
| // overflow. Has no effect if the OS doesn't provide the necessary facility. |
| BASE_EXPORT void EnableTerminationOnHeapCorruption(); |
| |
| // Turns on process termination if memory runs out. |
| BASE_EXPORT void EnableTerminationOnOutOfMemory(); |
| |
| #if defined(OS_WIN) |
| // Returns the module handle to which an address belongs. The reference count |
| // of the module is not incremented. |
| BASE_EXPORT HMODULE GetModuleFromAddress(void* address); |
| #endif |
| |
| #if defined(OS_LINUX) || defined(OS_ANDROID) |
| BASE_EXPORT extern size_t g_oom_size; |
| |
| // The maximum allowed value for the OOM score. |
| const int kMaxOomScore = 1000; |
| |
| // This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will |
| // prefer to kill certain process types over others. The range for the |
| // adjustment is [-1000, 1000], with [0, 1000] being user accessible. |
| // If the Linux system doesn't support the newer oom_score_adj range |
| // of [0, 1000], then we revert to using the older oom_adj, and |
| // translate the given value into [0, 15]. Some aliasing of values |
| // may occur in that case, of course. |
| BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score); |
| #endif |
| |
| #if defined(OS_MACOSX) |
| // Very large images or svg canvases can cause huge mallocs. Skia |
| // does tricks on tcmalloc-based systems to allow malloc to fail with |
| // a NULL rather than hit the oom crasher. This replicates that for |
| // OSX. |
| // |
| // IF YOU USE THIS WITHOUT CONSULTING YOUR FRIENDLY OSX DEVELOPER, |
| // YOUR CODE IS LIKELY TO BE REVERTED. THANK YOU. |
| BASE_EXPORT void* UncheckedMalloc(size_t size); |
| BASE_EXPORT void* UncheckedCalloc(size_t num_items, size_t size); |
| #endif // defined(OS_MACOSX) |
| |
| } // namespace base |
| |
| #endif // BASE_PROCESS_MEMORY_H_ |
