b99a099cad
value of sbrk(0) in UNIX. In terms of dlmalloc and our proprietary contiguous mspace class, this is the highest address returned by its morecore method.
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
|
|
* Copyright (C) 2006 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/* A wrapper file for dlmalloc.h that defines prototypes for the
|
|
* mspace_*() functions, which provide an interface for creating
|
|
* multiple heaps.
|
|
*/
|
|
|
|
#ifndef MSPACE_H_
|
|
#define MSPACE_H_
|
|
|
|
/* It's a pain getting the mallinfo stuff to work
|
|
* with Linux, OSX, and klibc, so just turn it off
|
|
* for now.
|
|
* TODO: make mallinfo work
|
|
*/
|
|
#define NO_MALLINFO 1
|
|
|
|
/* Allow setting the maximum heap footprint.
|
|
*/
|
|
#define USE_MAX_ALLOWED_FOOTPRINT 1
|
|
|
|
#define USE_CONTIGUOUS_MSPACES 1
|
|
#if USE_CONTIGUOUS_MSPACES
|
|
#define HAVE_MMAP 0
|
|
#define HAVE_MORECORE 1
|
|
#define MORECORE_CONTIGUOUS 0
|
|
#endif
|
|
|
|
#define MSPACES 1
|
|
#define ONLY_MSPACES 1
|
|
#include "../../../../bionic/libc/bionic/dlmalloc.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
mspace_usable_size(void* p);
|
|
|
|
Returns the number of bytes you can actually use in
|
|
an allocated chunk, which may be more than you requested (although
|
|
often not) due to alignment and minimum size constraints.
|
|
You can use this many bytes without worrying about
|
|
overwriting other allocated objects. This is not a particularly great
|
|
programming practice. mspace_usable_size can be more useful in
|
|
debugging and assertions, for example:
|
|
|
|
p = mspace_malloc(msp, n);
|
|
assert(mspace_usable_size(msp, p) >= 256);
|
|
*/
|
|
size_t mspace_usable_size(mspace, const void*);
|
|
|
|
#if USE_CONTIGUOUS_MSPACES
|
|
/*
|
|
Similar to create_mspace(), but the underlying memory is
|
|
guaranteed to be contiguous. No more than max_capacity
|
|
bytes is ever allocated to the mspace.
|
|
*/
|
|
mspace create_contiguous_mspace(size_t starting_capacity, size_t max_capacity,
|
|
int locked);
|
|
|
|
/*
|
|
Identical to create_contiguous_mspace, but labels the mapping 'mspace/name'
|
|
instead of 'mspace'
|
|
*/
|
|
mspace create_contiguous_mspace_with_name(size_t starting_capacity,
|
|
size_t max_capacity, int locked, const char *name);
|
|
|
|
/*
|
|
Identical to create_contiguous_mspace, but uses previously mapped memory.
|
|
*/
|
|
mspace create_contiguous_mspace_with_base(size_t starting_capacity,
|
|
size_t max_capacity, int locked, void *base);
|
|
|
|
size_t destroy_contiguous_mspace(mspace msp);
|
|
|
|
/*
|
|
Returns the position of the "break" within the given mspace.
|
|
*/
|
|
void *contiguous_mspace_sbrk0(mspace msp);
|
|
#endif
|
|
|
|
/*
|
|
Call the handler for each block in the specified mspace.
|
|
chunkptr and chunklen refer to the heap-level chunk including
|
|
the chunk overhead, and userptr and userlen refer to the
|
|
user-usable part of the chunk. If the chunk is free, userptr
|
|
will be NULL and userlen will be 0. userlen is not guaranteed
|
|
to be the same value passed into malloc() for a given chunk;
|
|
it is >= the requested size.
|
|
*/
|
|
void mspace_walk_heap(mspace msp,
|
|
void(*handler)(const void *chunkptr, size_t chunklen,
|
|
const void *userptr, size_t userlen, void *arg), void *harg);
|
|
|
|
/*
|
|
mspace_walk_free_pages(handler, harg)
|
|
|
|
Calls the provided handler on each free region in the specified
|
|
mspace. The memory between start and end are guaranteed not to
|
|
contain any important data, so the handler is free to alter the
|
|
contents in any way. This can be used to advise the OS that large
|
|
free regions may be swapped out.
|
|
|
|
The value in harg will be passed to each call of the handler.
|
|
*/
|
|
void mspace_walk_free_pages(mspace msp,
|
|
void(*handler)(void *start, void *end, void *arg), void *harg);
|
|
|
|
#ifdef __cplusplus
|
|
}; /* end of extern "C" */
|
|
#endif
|
|
|
|
#endif /* MSPACE_H_ */
|