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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef BASE_PROCESS_MEMORY_H_ | 5 #ifndef BASE_PROCESS_MEMORY_H_ |
| 6 #define BASE_PROCESS_MEMORY_H_ | 6 #define BASE_PROCESS_MEMORY_H_ |
| 7 | 7 |
| 8 #include <stddef.h> | 8 #include <stddef.h> |
| 9 | 9 |
| 10 #include "base/base_export.h" | 10 #include "base/base_export.h" |
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| 44 // If the Linux system doesn't support the newer oom_score_adj range | 44 // If the Linux system doesn't support the newer oom_score_adj range |
| 45 // of [0, 1000], then we revert to using the older oom_adj, and | 45 // of [0, 1000], then we revert to using the older oom_adj, and |
| 46 // translate the given value into [0, 15]. Some aliasing of values | 46 // translate the given value into [0, 15]. Some aliasing of values |
| 47 // may occur in that case, of course. | 47 // may occur in that case, of course. |
| 48 BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score); | 48 BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score); |
| 49 #endif | 49 #endif |
| 50 | 50 |
| 51 #if defined(OS_WIN) | 51 #if defined(OS_WIN) |
| 52 namespace win { | 52 namespace win { |
| 53 | 53 |
| 54 // Custom exception code chosen to indicate an out of memory error. | 54 // Custom Windows exception code chosen to indicate an out of memory error. |
| 55 // See https://msdn.microsoft.com/en-us/library/het71c37.aspx. | 55 // See https://msdn.microsoft.com/en-us/library/het71c37.aspx. |
| 56 // "To make sure that you do not define a code that conflicts with an existing | 56 // "To make sure that you do not define a code that conflicts with an existing |
| 57 // exception code" ... "The resulting error code should therefore have the | 57 // exception code" ... "The resulting error code should therefore have the |
| 58 // highest four bits set to hexadecimal E." | 58 // highest four bits set to hexadecimal E." |
| 59 // 0xe0000008 was chosen arbitrarily, as 0x00000008 is ERROR_NOT_ENOUGH_MEMORY. | 59 // 0xe0000008 was chosen arbitrarily, as 0x00000008 is ERROR_NOT_ENOUGH_MEMORY. |
| 60 const DWORD kOomExceptionCode = 0xe0000008; | 60 const DWORD kOomExceptionCode = 0xe0000008; |
| 61 | 61 |
| 62 } // namespace win | 62 } // namespace win |
| 63 #endif | 63 #endif |
| 64 | 64 |
| 65 // Special allocator functions for callers that want to check for OOM. | 65 // Special allocator functions for callers that want to check for OOM. |
| 66 // These will not abort if the allocation fails even if | 66 // These will not abort if the allocation fails even if |
| 67 // EnableTerminationOnOutOfMemory has been called. | 67 // EnableTerminationOnOutOfMemory has been called. |
| 68 // This can be useful for huge and/or unpredictable size memory allocations. | 68 // This can be useful for huge and/or unpredictable size memory allocations. |
| 69 // Please only use this if you really handle the case when the allocation | 69 // Please only use this if you really handle the case when the allocation |
| 70 // fails. Doing otherwise would risk security. | 70 // fails. Doing otherwise would risk security. |
| 71 // These functions may still crash on OOM when running under memory tools, | 71 // These functions may still crash on OOM when running under memory tools, |
| 72 // specifically ASan and other sanitizers. | 72 // specifically ASan and other sanitizers. |
| 73 // Return value tells whether the allocation succeeded. If it fails |result| is | 73 // Return value tells whether the allocation succeeded. If it fails |result| is |
| 74 // set to NULL, otherwise it holds the memory address. | 74 // set to NULL, otherwise it holds the memory address. |
| 75 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size, | 75 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size, |
| 76 void** result); | 76 void** result); |
| 77 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedCalloc(size_t num_items, | 77 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedCalloc(size_t num_items, |
| 78 size_t size, | 78 size_t size, |
| 79 void** result); | 79 void** result); |
| 80 | 80 |
| 81 } // namespace base | 81 } // namespace base |
| 82 | 82 |
| 83 #endif // BASE_PROCESS_MEMORY_H_ | 83 #endif // BASE_PROCESS_MEMORY_H_ |
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