83 lines
2 KiB
C
83 lines
2 KiB
C
/*
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OpenLase - a realtime laser graphics toolkit
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Copyright (C) 2009-2011 Hector Martin "marcan" <hector@marcansoft.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 or version 3.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef ALIGN_H
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#define ALIGN_H
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#include "config.h"
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#include <assert.h>
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#include <stdlib.h>
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#ifdef HAVE_MALLOC_H
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# include <malloc.h>
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#endif
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#define CHECK_ALIGNMENT \
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assert(alignment != 0 && (alignment&(alignment-1)) == 0); \
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if (alignment < sizeof(void*)) alignment = sizeof(void*)
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#if defined(HAVE_POSIX_MEMALIGN)
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static inline void *malloc_align(size_t size, size_t alignment)
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{
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void *p;
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CHECK_ALIGNMENT;
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if (posix_memalign(&p, alignment, size) == 0)
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return p;
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else
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return NULL;
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}
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# define free_align free
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#elif defined(HAVE_MEMALIGN)
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static inline void *malloc_align(size_t size, size_t alignment)
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{
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CHECK_ALIGNMENT;
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return memalign(alignment, size);
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}
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# define free_align free
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#elif defined(HAVE_ALIGNED_MALLOC)
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static inline void *malloc_align(size_t size, size_t alignment)
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{
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CHECK_ALIGNMENT;
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return _aligned_malloc(size, alignment);
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}
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# define free_align _aligned_free
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#else
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static inline void *malloc_align(size_t size, size_t alignment)
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{
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CHECK_ALIGNMENT;
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void *p = malloc(size + alignment + sizeof(void*) - 1);
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uintptr_t ip = sizeof(void*) + (uintptr_t)p;
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if (ip & (alignment-1))
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ip = (ip & ~(alignment-1)) + alignment;
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((void**)ip)[-1] = p;
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return (void*)ip;
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}
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static inline void free_align(void *p)
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{
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free(((void **)p)[-1]);
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}
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#endif
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#undef CHECK_ALIGNMENT
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#endif
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