94 lines
2.1 KiB
C++
94 lines
2.1 KiB
C++
#ifndef _FREELIST_H
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#define _FREELIST_H
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#include <bfc/wasabi_std.h>
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#include <bfc/memblock.h>
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#include <bfc/ptrlist.h>
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// actual implementation
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class FreelistPriv {
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protected:
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FreelistPriv();
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~FreelistPriv();
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void *getRecord(int typesize, int blocksize, int initialblocksize);
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void freeRecord(void *rec);
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private:
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int total_allocated;
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typedef uint8_t MBT;
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class FLMemBlock : public MemBlock<MBT> {
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public:
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FLMemBlock(int siz) : MemBlock<MBT>(siz) {
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freelist = getMemory();
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nallocated = 0;
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}
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void *freelist;
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int nallocated; // # of records assigned from block
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};
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PtrList< FLMemBlock > blocks; // the blocks of mem we alloc from
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};
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// type-safe template
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static const int DEF_BLOCKSIZE=250;
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template
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<class T, int BLOCKSIZE=DEF_BLOCKSIZE, int INITIALBLOCKSIZE=DEF_BLOCKSIZE, int ALIGNMENT=4>
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class Freelist : private FreelistPriv {
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public:
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// just returns the memory, you have to call constructor manually
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T *getRecord() {
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return static_cast<T *>(FreelistPriv::getRecord(itemsize(), BLOCKSIZE, INITIALBLOCKSIZE));
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}
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// creates object via default constructor
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T *newRecord() {
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T *ret = getRecord();
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#ifdef FORTIFY
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#undef new
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#endif
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new(ret) T;
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#ifdef FORTIFY
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#define new ZFortify_New
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#endif
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return ret;
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}
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// creates object via 1-parameter constructor
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template<class P1>
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T *newRecord(P1 p1) {
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T *ret = getRecord();
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#ifdef FORTIFY
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#undef new
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#endif
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new(ret) T(p1);
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#ifdef FORTIFY
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#define new ZFortify_New
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#endif
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return ret;
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}
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// just frees it, you have to call destructor manually
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void freeRecord(T *record) { FreelistPriv::freeRecord(record); }
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// calls delete for you, and frees it
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void deleteRecord(T *record) {
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if (record != NULL) {
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record->~T();
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freeRecord(record);
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}
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}
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void deletePtrList(PtrList<T> *list) {
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ASSERT(list != NULL);
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for (int i = 0; i < list->getNumItems(); i++) {
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deleteRecord(list->enumItem(i));
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}
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list->removeAll();
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}
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protected:
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int itemsize() { return (sizeof(T) + (ALIGNMENT-1)) - (sizeof(T) % ALIGNMENT); }
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};
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#endif
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