vladislavbelov
8c068aab07
Tested By: Langbart Differential Revision: https://code.wildfiregames.com/D4470 This was SVN commit r26281.
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/* Copyright (C) 2022 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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#ifndef INCLUDED_ALLOCATORS_PAGE_ALIGNED
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#define INCLUDED_ALLOCATORS_PAGE_ALIGNED
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#include "lib/posix/posix_mman.h" // PROT_*
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// very thin wrapper on top of sys/mman.h that makes the intent more obvious
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// (its commit/decommit semantics are difficult to tell apart)
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Status mem_Reserve(size_t size, u8** pp);
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Status mem_Release(u8* p, size_t size);
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Status mem_Commit(u8* p, size_t size, int prot);
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Status mem_Decommit(u8* p, size_t size);
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Status mem_Protect(u8* p, size_t size, int prot);
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/**
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* allocate memory aligned to the system page size.
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*
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* this is useful for file_cache_alloc, which uses this allocator to
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* get sector-aligned (hopefully; see sys_max_sector_size) IO buffers.
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*
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* note that this allocator is stateless and very little error checking
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* can be performed.
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*
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* the memory is initially writable and you can use mprotect to set other
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* access permissions if desired.
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*
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* @param unaligned_size minimum size [bytes] to allocate.
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* @return page-aligned and -padded memory or 0 on error / out of memory.
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**/
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void* page_aligned_alloc(size_t unaligned_size);
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/**
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* free a previously allocated page-aligned region.
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*
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* @param p Exact value returned from page_aligned_alloc
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* @param unaligned_size Exact value passed to page_aligned_alloc
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**/
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void page_aligned_free(void* p, size_t unaligned_size);
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#endif // #ifndef INCLUDED_ALLOCATORS_PAGE_ALIGNED
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