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#ifndef _LIBALLOC_H
#define _LIBALLOC_H
#include <stddef.h>
/** This is a boundary tag which is prepended to the
* page or section of a page which we have allocated. It is
* used to identify valid memory blocks that the
* application is trying to free.
*/
struct boundary_tag
{
unsigned int magic; //< It's a kind of ...
unsigned int size; //< Requested size.
unsigned int real_size; //< Actual size.
int index; //< Location in the page table.
struct boundary_tag *split_left; //< Linked-list info for broken pages.
struct boundary_tag *split_right; //< The same.
struct boundary_tag *next; //< Linked list info.
struct boundary_tag *prev; //< Linked list info.
};
/** This function is supposed to lock the memory data structures. It
* could be as simple as disabling interrupts or acquiring a spinlock.
* It's up to you to decide.
*
* \return 0 if the lock was acquired successfully. Anything else is
* failure.
*/
extern int liballoc_lock();
/** This function unlocks what was previously locked by the liballoc_lock
* function. If it disabled interrupts, it enables interrupts. If it
* had acquiried a spinlock, it releases the spinlock. etc.
*
* \return 0 if the lock was successfully released.
*/
extern int liballoc_unlock();
/** This is the hook into the local system which allocates pages. It
* accepts an integer parameter which is the number of pages
* required. The page size was set up in the liballoc_init function.
*
* \return NULL if the pages were not allocated.
* \return A pointer to the allocated memory.
*/
extern void* liballoc_alloc(int);
/** This frees previously allocated memory. The void* parameter passed
* to the function is the exact same value returned from a previous
* liballoc_alloc call.
*
* The integer value is the number of pages to free.
*
* \return 0 if the memory was successfully freed.
*/
extern int liballoc_free(void*,int);
void *malloc(size_t); //< The standard function.
void *realloc(void *, size_t); //< The standard function.
void *calloc(size_t, size_t); //< The standard function.
void free(void *); //< The standard function.
#endif
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