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54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
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** _heap.h
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**
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** Ullrich von Bassewitz, 1998-06-03, 2004-12-19
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**
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*/
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#ifndef __HEAP_H
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#define __HEAP_H
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/* Structure that preceeds a user block in most cases.
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** The aligned_malloc function may generate blocks where the start pointer
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** and size are splitted to handle a memory hole that is needed for
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** alignment.
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*/
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struct usedblock {
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unsigned size;
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struct usedblock* start;
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};
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/* Space needed for administering used blocks */
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#define HEAP_ADMIN_SPACE sizeof (struct usedblock)
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/* The data type used to implement the free list.
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** Beware: Field order is significant!
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*/
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struct freeblock {
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unsigned size;
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struct freeblock* next;
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struct freeblock* prev;
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};
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/* Variables that describe the heap */
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extern unsigned* _heaporg; /* Bottom of heap */
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extern unsigned* _heapptr; /* Current top */
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extern unsigned* _heapend; /* Upper limit */
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extern struct freeblock* _heapfirst; /* First free block in list */
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extern struct freeblock* _heaplast; /* Last free block in list */
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/* End of _heap.h */
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#endif
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