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/**
* @file zone.c
* @brief Zone allocation via mmap.
*/
#include "malloc_internal.h"
#include <sys/mman.h>
#include <unistd.h>
static size_t
_s_zone_size (size_t alloc_max)
{
size_t chunk_size;
size_t total;
size_t page_size;
chunk_size = ALIGN (sizeof (t_chunk)) + ALIGN (alloc_max);
total = ALIGN (sizeof (t_zone)) + MIN_ALLOC_COUNT * chunk_size;
page_size = (size_t)getpagesize ();
return ((total + page_size - 1) & ~(page_size - 1));
}
t_zone *
zone_new (size_t alloc_max)
{
size_t zone_size;
t_zone *zone;
t_chunk *chunk;
zone_size = _s_zone_size (alloc_max);
zone = mmap (NULL, zone_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (zone == MAP_FAILED)
return (NULL);
zone->next = NULL;
zone->size = zone_size;
chunk = (t_chunk *)((char *)zone + ALIGN (sizeof (t_zone)));
chunk->size = zone_size - ALIGN (sizeof (t_zone)) - ALIGN (sizeof (t_chunk));
chunk->next = NULL;
chunk->is_free = 1;
return (zone);
}
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