15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2005, Google Inc. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// All rights reserved. 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Redistribution and use in source and binary forms, with or without 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// modification, are permitted provided that the following conditions are 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// met: 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// * Redistributions of source code must retain the above copyright 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// notice, this list of conditions and the following disclaimer. 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// * Redistributions in binary form must reproduce the above 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// copyright notice, this list of conditions and the following disclaimer 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// in the documentation and/or other materials provided with the 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// distribution. 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// * Neither the name of Google Inc. nor the names of its 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// contributors may be used to endorse or promote products derived from 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// this software without specific prior written permission. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// --- 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Author: Sanjay Ghemawat 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Routine that uses sbrk/mmap to allocate memory from the system. 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Useful for implementing malloc. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef TCMALLOC_SYSTEM_ALLOC_H_ 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define TCMALLOC_SYSTEM_ALLOC_H_ 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <config.h> 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <stddef.h> // for size_t 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class SysAllocator; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// REQUIRES: "alignment" is a power of two or "0" to indicate default alignment 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Allocate and return "N" bytes of zeroed memory. 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// If actual_bytes is NULL then the returned memory is exactly the 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// requested size. If actual bytes is non-NULL then the allocator 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// may optionally return more bytes than asked for (i.e. return an 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// entire "huge" page if a huge page allocator is in use). 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The returned pointer is a multiple of "alignment" if non-zero. The 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// returned pointer will always be aligned suitably for holding a 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// void*, double, or size_t. In addition, if this platform defines 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// CACHELINE_ALIGNED, the return pointer will always be cacheline 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// aligned. 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Returns NULL when out of memory. 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern void* TCMalloc_SystemAlloc(size_t bytes, size_t *actual_bytes, 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t alignment = 0); 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This call is a hint to the operating system that the pages 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// contained in the specified range of memory will not be used for a 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// while, and can be released for use by other processes or the OS. 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Pages which are released in this way may be destroyed (zeroed) by 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// the OS. The benefit of this function is that it frees memory for 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// use by the system, the cost is that the pages are faulted back into 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// the address space next time they are touched, which can impact 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// performance. (Only pages fully covered by the memory region will 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// be released, partial pages will not.) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern void TCMalloc_SystemRelease(void* start, size_t length); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The current system allocator. 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)extern PERFTOOLS_DLL_DECL SysAllocator* sys_alloc; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif /* TCMALLOC_SYSTEM_ALLOC_H_ */ 78