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40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
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#ifndef GC_MALLOC_H
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#define GC_MALLOC_H
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#include <stdint.h>
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#include <unistd.h>
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// Generally, inline functions are preferable to macros resembling functions.
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// https://www.kernel.org/doc/html/v4.10/process/coding-style.html#data-structures
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#define OVERHEAD 1 /* Number of 8-byte segments for chunk size & flags */
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#define MAGIC 2 /* Number of 8-byte segments from top of chunk to fields */
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#define MIN 3 /* Minimum number of 8-byte segments for data in a chunk */
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/*
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* Metadata for allocated memory
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*
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* footer: user data for previous chunk
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* size: size of chunk in bytes
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* merge: flag to identify when the chunk can be coalesced
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* free: flag to identify when the chunk is free
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* next: pointer to next chunk in the free list
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* prev: pointer to previous chunk in the free list
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*/
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struct gc_chunk {
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uint64_t footer;
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uint32_t size;
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uint16_t merge;
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uint16_t free;
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struct gc_chunk *next;
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struct gc_chunk *prev;
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};
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// Performs allocations of SIZE bytes
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void *gc_malloc(size_t size);
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// Frees blocks of memory allocated by 'gc_alloc'
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void gc_free(void *ptr);
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#endif /* GC_MALLOC_H */
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