mirror of
https://gitea.wildfiregames.com/0ad/0ad
synced 2026-06-16 05:13:58 -07:00
6c915291cc
major refactor of wfilesystem - remove gotos and workaround for FAT file times replace more round_up of constants with Align<> remove old unused allocators (STL aligned, matrix, some shared_ptr) move allocator utils into separate headers. remove lockfree, wterminal avoid testing __cplusplus This was SVN commit r9361.
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "precompiled.h"
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#include "lib/allocators/page_aligned.h"
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#include "lib/alignment.h"
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#include "lib/sysdep/cpu.h" // cpu_CAS
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//-----------------------------------------------------------------------------
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static inline LibError LibError_from_mmap(void* ret, bool warn_if_failed = true)
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{
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if(ret != MAP_FAILED)
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return INFO::OK;
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return LibError_from_errno(warn_if_failed);
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}
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// "anonymous" effectively means mapping /dev/zero, but is more efficient.
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// MAP_ANONYMOUS is not in SUSv3, but is a very common extension.
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// unfortunately, MacOS X only defines MAP_ANON, which Solaris says is
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// deprecated. workaround there: define MAP_ANONYMOUS in terms of MAP_ANON.
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#ifndef MAP_ANONYMOUS
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# define MAP_ANONYMOUS MAP_ANON
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#endif
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static const int mmap_flags = MAP_PRIVATE|MAP_ANONYMOUS;
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LibError mem_Reserve(size_t size, u8** pp)
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{
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errno = 0;
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void* ret = mmap(0, size, PROT_NONE, mmap_flags|MAP_NORESERVE, -1, 0);
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*pp = (u8*)ret;
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return LibError_from_mmap(ret);
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}
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LibError mem_Release(u8* p, size_t size)
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{
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errno = 0;
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int ret = munmap(p, size);
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return LibError_from_posix(ret);
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}
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LibError mem_Commit(u8* p, size_t size, int prot)
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{
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// avoid misinterpretation by mmap.
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if(prot == PROT_NONE)
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WARN_RETURN(ERR::INVALID_PARAM);
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errno = 0;
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void* ret = mmap(p, size, prot, mmap_flags|MAP_FIXED, -1, 0);
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return LibError_from_mmap(ret);
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}
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LibError mem_Decommit(u8* p, size_t size)
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{
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errno = 0;
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void* ret = mmap(p, size, PROT_NONE, mmap_flags|MAP_NORESERVE|MAP_FIXED, -1, 0);
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return LibError_from_mmap(ret);
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}
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LibError mem_Protect(u8* p, size_t size, int prot)
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{
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errno = 0;
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int ret = mprotect(p, size, prot);
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return LibError_from_posix(ret);
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}
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//-----------------------------------------------------------------------------
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void* page_aligned_alloc(size_t size)
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{
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const size_t alignedSize = Align<pageSize>(size);
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u8* p = 0;
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RETURN0_IF_ERR(mem_Reserve(alignedSize, &p));
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RETURN0_IF_ERR(mem_Commit(p, alignedSize, PROT_READ|PROT_WRITE));
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return p;
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}
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void page_aligned_free(void* p, size_t size)
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{
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if(!p)
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return;
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debug_assert(IsAligned(p, pageSize));
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const size_t alignedSize = Align<pageSize>(size);
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(void)mem_Release((u8*)p, alignedSize);
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}
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