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83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2012 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included 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
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*
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* CoglMagazine provides a really light weight allocator for chunks
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* of memory with a pre-determined size.
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*
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* This allocator builds on CoglMemoryStack for making all initial
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* allocations but never frees memory back to the stack.
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*
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* Memory chunks that haven't been allocated yet are stored in a
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* singly linked, fifo, list.
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*
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* Allocating from a magazine is simply a question of popping an entry
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* from the head of the fifo list. If no entries are available then
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* instead allocate from the memory stack instead.
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*
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* When an entry is freed, it is put back into the fifo list for
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* re-use.
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*
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* No attempt is ever made to shrink the amount of memory associated
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* with a CoglMagazine.
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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#include "cogl-config.h"
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#include "cogl-memory-stack-private.h"
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#include "cogl-magazine-private.h"
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#include <glib.h>
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#define ROUND_UP_8(X) ((X + (8 - 1)) & ~(8 - 1))
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CoglMagazine *
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_cogl_magazine_new (size_t chunk_size, int initial_chunk_count)
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{
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CoglMagazine *magazine = g_new0 (CoglMagazine, 1);
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chunk_size = MAX (chunk_size, sizeof (CoglMagazineChunk));
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chunk_size = ROUND_UP_8 (chunk_size);
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magazine->chunk_size = chunk_size;
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magazine->stack = _cogl_memory_stack_new (chunk_size * initial_chunk_count);
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magazine->head = NULL;
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return magazine;
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}
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void
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_cogl_magazine_free (CoglMagazine *magazine)
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{
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_cogl_memory_stack_free (magazine->stack);
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g_free (magazine);
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}
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