122 lines
3.3 KiB
C++
122 lines
3.3 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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/*
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* pool allocator
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*/
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#include "precompiled.h"
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#include "lib/allocators/pool.h"
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#include "lib/allocators/mem_util.h"
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LibError pool_create(Pool* p, size_t max_size, size_t el_size)
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{
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if(el_size == POOL_VARIABLE_ALLOCS)
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p->el_size = 0;
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else
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p->el_size = mem_RoundUpToAlignment(el_size);
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p->freelist = mem_freelist_Sentinel();
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RETURN_ERR(da_alloc(&p->da, max_size));
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return INFO::OK;
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}
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LibError pool_destroy(Pool* p)
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{
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// don't be picky and complain if the freelist isn't empty;
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// we don't care since it's all part of the da anyway.
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// however, zero it to prevent further allocs from succeeding.
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p->freelist = mem_freelist_Sentinel();
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return da_free(&p->da);
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}
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bool pool_contains(const Pool* p, void* el)
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{
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// outside of our range
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if(!(p->da.base <= el && el < p->da.base+p->da.pos))
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return false;
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// sanity check: it should be aligned (if pool has fixed-size elements)
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if(p->el_size)
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debug_assert((uintptr_t)((u8*)el - p->da.base) % p->el_size == 0);
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return true;
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}
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void* pool_alloc(Pool* p, size_t size)
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{
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// if pool allows variable sizes, go with the size parameter,
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// otherwise the pool el_size setting.
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const size_t el_size = p->el_size? p->el_size : mem_RoundUpToAlignment(size);
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// note: this can never happen in pools with variable-sized elements
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// because they disallow pool_free.
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void* el = mem_freelist_Detach(p->freelist);
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if(el)
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goto have_el;
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// alloc a new entry
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{
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// expand, if necessary
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if(da_reserve(&p->da, el_size) < 0)
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return 0;
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el = p->da.base + p->da.pos;
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p->da.pos += el_size;
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}
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have_el:
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debug_assert(pool_contains(p, el)); // paranoia
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return el;
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}
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void pool_free(Pool* p, void* el)
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{
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// only allowed to free items if we were initialized with
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// fixed el_size. (this avoids having to pass el_size here and
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// check if requested_size matches that when allocating)
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if(p->el_size == 0)
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{
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debug_assert(0); // cannot free variable-size items
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return;
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}
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if(pool_contains(p, el))
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mem_freelist_AddToFront(p->freelist, el);
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else
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debug_assert(0); // invalid pointer (not in pool)
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}
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void pool_free_all(Pool* p)
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{
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p->freelist = mem_freelist_Sentinel();
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// must be reset before da_set_size or CHECK_DA will complain.
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p->da.pos = 0;
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da_set_size(&p->da, 0);
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}
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