forked from 0ad/0ad
janwas
045ac1c197
mem_util: inline freelist functions to avoid needing an additional if() in pool.cpp pool: add comments clarifying the roles of PoolAllocator vs RawPoolAllocator wsdl: refactor (naming convention, determination of window style, reduce forward decls) This was SVN commit r7610.
111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
/* Copyright (c) 2010 Wildfire Games
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* memory allocator helper routines.
|
|
*/
|
|
|
|
#include "precompiled.h"
|
|
#include "lib/allocators/mem_util.h"
|
|
|
|
#include "lib/bits.h" // round_up
|
|
#include "lib/posix/posix_mman.h"
|
|
#include "lib/sysdep/os_cpu.h" // os_cpu_PageSize
|
|
|
|
|
|
bool mem_IsPageMultiple(uintptr_t x)
|
|
{
|
|
return (x & (os_cpu_PageSize()-1)) == 0;
|
|
}
|
|
|
|
size_t mem_RoundUpToPage(size_t size)
|
|
{
|
|
return round_up(size, os_cpu_PageSize());
|
|
}
|
|
|
|
size_t mem_RoundUpToAlignment(size_t size)
|
|
{
|
|
// all allocators should align to at least this many bytes:
|
|
const size_t alignment = 8;
|
|
return round_up(size, alignment);
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
static inline LibError LibError_from_mmap(void* ret, bool warn_if_failed = true)
|
|
{
|
|
if(ret != MAP_FAILED)
|
|
return INFO::OK;
|
|
return LibError_from_errno(warn_if_failed);
|
|
}
|
|
|
|
// "anonymous" effectively means mapping /dev/zero, but is more efficient.
|
|
// MAP_ANONYMOUS is not in SUSv3, but is a very common extension.
|
|
// unfortunately, MacOS X only defines MAP_ANON, which Solaris says is
|
|
// deprecated. workaround there: define MAP_ANONYMOUS in terms of MAP_ANON.
|
|
#ifndef MAP_ANONYMOUS
|
|
# define MAP_ANONYMOUS MAP_ANON
|
|
#endif
|
|
|
|
static const int mmap_flags = MAP_PRIVATE|MAP_ANONYMOUS;
|
|
|
|
LibError mem_Reserve(size_t size, u8** pp)
|
|
{
|
|
errno = 0;
|
|
void* ret = mmap(0, size, PROT_NONE, mmap_flags|MAP_NORESERVE, -1, 0);
|
|
*pp = (u8*)ret;
|
|
return LibError_from_mmap(ret);
|
|
}
|
|
|
|
LibError mem_Release(u8* p, size_t size)
|
|
{
|
|
errno = 0;
|
|
int ret = munmap(p, size);
|
|
return LibError_from_posix(ret);
|
|
}
|
|
|
|
LibError mem_Commit(u8* p, size_t size, int prot)
|
|
{
|
|
// avoid misinterpretation by mmap.
|
|
if(prot == PROT_NONE)
|
|
WARN_RETURN(ERR::INVALID_PARAM);
|
|
|
|
errno = 0;
|
|
void* ret = mmap(p, size, prot, mmap_flags|MAP_FIXED, -1, 0);
|
|
return LibError_from_mmap(ret);
|
|
}
|
|
|
|
LibError mem_Decommit(u8* p, size_t size)
|
|
{
|
|
errno = 0;
|
|
void* ret = mmap(p, size, PROT_NONE, mmap_flags|MAP_NORESERVE|MAP_FIXED, -1, 0);
|
|
return LibError_from_mmap(ret);
|
|
}
|
|
|
|
LibError mem_Protect(u8* p, size_t size, int prot)
|
|
{
|
|
errno = 0;
|
|
int ret = mprotect(p, size, prot);
|
|
return LibError_from_posix(ret);
|
|
}
|