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[176] | 1 | /* -*- C++ -*- */ |
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| 2 | |
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| 3 | #ifndef _BOUNDEDFREELISTHEAP_H_ |
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| 4 | #define _BOUNDEDFREELISTHEAP_H_ |
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| 5 | |
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| 6 | // Beware -- this is for one "size class" only!! |
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| 7 | |
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| 8 | template <int numObjects, class Super> |
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| 9 | class BoundedFreeListHeap : public Super { |
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| 10 | public: |
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| 11 | |
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| 12 | BoundedFreeListHeap (void) |
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| 13 | : nObjects (0), |
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| 14 | myFreeList (NULL) |
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| 15 | {} |
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| 16 | |
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| 17 | ~BoundedFreeListHeap (void) |
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| 18 | { |
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| 19 | clear(); |
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| 20 | } |
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| 21 | |
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| 22 | inline void * malloc (size_t sz) { |
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| 23 | // Check the free list first. |
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| 24 | void * ptr = myFreeList; |
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| 25 | if (ptr == NULL) { |
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| 26 | ptr = Super::malloc (sz); |
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| 27 | } else { |
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| 28 | myFreeList = myFreeList->next; |
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| 29 | } |
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| 30 | return ptr; |
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| 31 | } |
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| 32 | |
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| 33 | inline void free (void * ptr) { |
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| 34 | if (nObjects < numObjects) { |
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| 35 | // Add this object to the free list. |
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| 36 | ((freeObject *) ptr)->next = myFreeList; |
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| 37 | myFreeList = (freeObject *) ptr; |
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| 38 | nObjects++; |
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| 39 | } else { |
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| 40 | clear(); |
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| 41 | // Super::free (ptr); |
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| 42 | } |
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| 43 | } |
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| 44 | |
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| 45 | inline void clear (void) { |
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| 46 | // Delete everything on the free list. |
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| 47 | void * ptr = myFreeList; |
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| 48 | while (ptr != NULL) { |
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| 49 | void * oldptr = ptr; |
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| 50 | ptr = (void *) ((freeObject *) ptr)->next; |
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| 51 | Super::free (oldptr); |
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| 52 | } |
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| 53 | myFreeList = NULL; |
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| 54 | nObjects = 0; |
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| 55 | } |
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| 56 | |
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| 57 | private: |
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| 58 | |
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| 59 | class freeObject { |
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| 60 | public: |
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| 61 | freeObject * next; |
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| 62 | }; |
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| 63 | |
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| 64 | int nObjects; |
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| 65 | freeObject * myFreeList; |
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| 66 | }; |
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| 67 | |
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| 68 | #endif |
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