84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* malloc.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <jack@crans.org> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/02/17 12:28:02 by jhalford #+# #+# */
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/* Updated: 2017/10/07 17:10:38 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "malloc_internal.h"
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t_chunk *g_zones[M_ZONES_MAX] =
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{
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NULL,
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NULL,
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NULL,
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};
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volatile int g_malloc_debug = 0;
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t_chunk **get_zone(size_t size)
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{
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if (M_ISLARGE(size))
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return (&g_zones[M_LARGE]);
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else if (M_ISSMALL(size))
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return (&g_zones[M_SMALL]);
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else
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return (&g_zones[M_TINY]);
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}
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void add_chunk(t_chunk **chunk, size_t size)
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{
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int chunk_size;
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t_chunk *new;
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t_node *node;
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if (M_ISLARGE(size))
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chunk_size = M_PAGEALIGN(size);
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else
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chunk_size = M_ISTINY(size) ? M_TINYCHUNK : M_SMALLCHUNK;
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chunk_size += M_CHUNKHEAD;
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if (!(new = mmap(NULL, chunk_size, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0)))
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error_mmap();
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if (g_malloc_debug >= 3)
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DGSN("malloc_debug", g_malloc_debug);
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new->next = *chunk;
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*chunk = new;
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node = (t_node*)(*chunk + 1);
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node->size = chunk_size - M_CHUNKHEAD;
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node->isfree = 1;
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node->islast = 1;
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}
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void *ft_malloc(size_t size)
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{
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t_chunk **zone;
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t_node *node;
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void *ret;
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g_malloc_debug = 1;
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if (g_malloc_debug >= 1)
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DGSN("malloc called with size", size);
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if (g_malloc_debug >= 2)
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{
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DGSN("malloc", size);
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show_alloc_mem();
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}
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size += M_NODEHEAD;
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zone = get_zone(size);
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while (!(node = find_node_firstfit(*zone, size)))
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add_chunk(zone, size);
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split_node(node, size);
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ret = (void*)(node + 1);
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if (g_malloc_debug >= 1)
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{
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DGSH("user got ptr", (long)ret);
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show_alloc_mem();
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}
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return (ret);
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}
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