1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H 6 #define BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H 7 8 #include <stddef.h> // for size_t 9 10 #include "base/allocator/allocator_extension_thunks.h" 11 #include "base/base_export.h" 12 #include "build/build_config.h" 13 14 namespace base { 15 namespace allocator { 16 17 // Request the allocator to report value of its waste memory size. 18 // Waste size corresponds to memory that has been allocated from the OS but 19 // not passed up to the application. It e.g. includes memory retained by free 20 // lists, internal data, chunks padding, etc. 21 // 22 // |size| pointer to the returned value, must be not NULL. 23 // Returns true if the value has been returned, false otherwise. 24 BASE_EXPORT bool GetAllocatorWasteSize(size_t* size); 25 26 // Request that the allocator print a human-readable description of the current 27 // state of the allocator into a null-terminated string in the memory segment 28 // buffer[0,buffer_length-1]. 29 // 30 // |buffer| must point to a valid piece of memory 31 // |buffer_length| must be > 0. 32 BASE_EXPORT void GetStats(char* buffer, int buffer_length); 33 34 // Request that the allocator release any free memory it knows about to the 35 // system. 36 BASE_EXPORT void ReleaseFreeMemory(); 37 38 39 // These settings allow specifying a callback used to implement the allocator 40 // extension functions. These are optional, but if set they must only be set 41 // once. These will typically called in an allocator-specific initialization 42 // routine. 43 // 44 // No threading promises are made. The caller is responsible for making sure 45 // these pointers are set before any other threads attempt to call the above 46 // functions. 47 BASE_EXPORT void SetGetAllocatorWasteSizeFunction( 48 thunks::GetAllocatorWasteSizeFunction get_allocator_waste_size_function); 49 50 BASE_EXPORT void SetGetStatsFunction( 51 thunks::GetStatsFunction get_stats_function); 52 53 BASE_EXPORT void SetReleaseFreeMemoryFunction( 54 thunks::ReleaseFreeMemoryFunction release_free_memory_function); 55 56 } // namespace allocator 57 } // namespace base 58 59 #endif 60
