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#ifndef DEF_HEAP_CLASS_H
#define DEF_HEAP_CLASS_H
#include <Core/common.wtf.h>
#include <TaskManager/Mutex.class.h>
//Heap minimum size : 2M
#define HEAP_MIN_SIZE 0x00200000
//Heap magic number, for verifications
#define HEAP_MAGIC 0xBEEF1337
struct heap_header_t {
u32int magic;
bool is_hole;
u32int size;
};
struct heap_footer_t {
u32int magic;
heap_header_t *header;
};
struct heap_index_t {
heap_header_t **data;
u32int size;
};
class PageDirectory;
class Heap {
private:
bool m_usable, m_user, m_rw;
u32int m_free, m_start, m_end;
heap_index_t m_index;
PageDirectory* m_pagedir;
Mutex m_mutex;
void insertIntoIndex(heap_header_t *e);
u32int findIndexEntry(heap_header_t *e);
void removeFromIndex(u32int idx);
void removeFromIndex(heap_header_t *e);
void expand(u32int quantity);
void contract(); //Quantity is automatically calculated
public:
Heap();
~Heap();
void create(u32int start, u32int size, u32int idxsize, PageDirectory* pagedir, bool user, bool rw);
void* alloc(u32int sz, bool no_expand = false);
void free(void* ptr);
bool usable() {
m_mutex.waitLock();
bool ret = m_usable;
m_mutex.unlock();
return ret;
}
u32int size() {
m_mutex.waitLock();
u32int ret = m_end - m_start;
m_mutex.unlock();
return ret;
}
u32int free() {
m_mutex.waitLock();
u32int ret = m_free;
m_mutex.unlock();
return ret;
}
};
#endif
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