[176] | 1 | /* -*- C++ -*- */ |
---|
| 2 | |
---|
| 3 | #ifndef _UNIQUEHEAP_H_ |
---|
| 4 | #define _UNIQUEHEAP_H_ |
---|
| 5 | |
---|
| 6 | #include <stdlib.h> |
---|
| 7 | #include <new> |
---|
| 8 | |
---|
| 9 | /** |
---|
| 10 | * |
---|
| 11 | * @class UniqueHeap |
---|
| 12 | * @brief Instantiates one instance of a class used for every malloc & free. |
---|
| 13 | * @author Emery Berger |
---|
| 14 | * |
---|
| 15 | */ |
---|
| 16 | |
---|
| 17 | template <class SuperHeap, class Child = int> |
---|
| 18 | class UniqueHeap { |
---|
| 19 | public: |
---|
| 20 | |
---|
| 21 | /** |
---|
| 22 | * Ensure that the super heap gets created, |
---|
| 23 | * and add a reference for every instance of unique heap. |
---|
| 24 | */ |
---|
| 25 | UniqueHeap (void) |
---|
| 26 | { |
---|
| 27 | volatile SuperHeap * forceCreationOfSuperHeap = getSuperHeap(); |
---|
| 28 | addRef(); |
---|
| 29 | } |
---|
| 30 | |
---|
| 31 | /** |
---|
| 32 | * @brief Delete one reference to the unique heap. |
---|
| 33 | * When the number of references goes to zero, |
---|
| 34 | * delete the super heap. |
---|
| 35 | */ |
---|
| 36 | ~UniqueHeap (void) { |
---|
| 37 | int r = delRef(); |
---|
| 38 | if (r <= 0) { |
---|
| 39 | getSuperHeap()->SuperHeap::~SuperHeap(); |
---|
| 40 | } |
---|
| 41 | } |
---|
| 42 | |
---|
| 43 | // The remaining public methods are just |
---|
| 44 | // thin wrappers that route calls to the static object. |
---|
| 45 | |
---|
| 46 | inline void * malloc (size_t sz) { |
---|
| 47 | return getSuperHeap()->malloc (sz); |
---|
| 48 | } |
---|
| 49 | |
---|
| 50 | inline void free (void * ptr) { |
---|
| 51 | getSuperHeap()->free (ptr); |
---|
| 52 | } |
---|
| 53 | |
---|
| 54 | inline size_t getSize (void * ptr) { |
---|
| 55 | return getSuperHeap()->getSize (ptr); |
---|
| 56 | } |
---|
| 57 | |
---|
| 58 | inline int remove (void * ptr) { |
---|
| 59 | return getSuperHeap()->remove (ptr); |
---|
| 60 | } |
---|
| 61 | |
---|
| 62 | inline void clear (void) { |
---|
| 63 | getSuperHeap()->clear(); |
---|
| 64 | } |
---|
| 65 | |
---|
| 66 | #if 0 |
---|
| 67 | inline int getAllocated (void) { |
---|
| 68 | return getSuperHeap()->getAllocated(); |
---|
| 69 | } |
---|
| 70 | |
---|
| 71 | inline int getMaxAllocated (void) { |
---|
| 72 | return getSuperHeap()->getMaxAllocated(); |
---|
| 73 | } |
---|
| 74 | |
---|
| 75 | inline int getMaxInUse (void) { |
---|
| 76 | return getSuperHeap()->getMaxInUse(); |
---|
| 77 | } |
---|
| 78 | #endif |
---|
| 79 | |
---|
| 80 | private: |
---|
| 81 | |
---|
| 82 | /// Add one reference. |
---|
| 83 | void addRef (void) { |
---|
| 84 | getRefs() += 1; |
---|
| 85 | } |
---|
| 86 | |
---|
| 87 | /// Delete one reference count. |
---|
| 88 | int delRef (void) { |
---|
| 89 | getRefs() -= 1; |
---|
| 90 | return getRefs(); |
---|
| 91 | } |
---|
| 92 | |
---|
| 93 | /// Internal accessor for reference count. |
---|
| 94 | int& getRefs (void) { |
---|
| 95 | static int numRefs = 0; |
---|
| 96 | return numRefs; |
---|
| 97 | } |
---|
| 98 | |
---|
| 99 | SuperHeap * getSuperHeap (void) { |
---|
| 100 | static char superHeapBuffer[sizeof(SuperHeap)]; |
---|
| 101 | static SuperHeap * aSuperHeap = (SuperHeap *) (new ((char *) &superHeapBuffer) SuperHeap); |
---|
| 102 | return aSuperHeap; |
---|
| 103 | } |
---|
| 104 | |
---|
| 105 | void doNothing (Child *) {} |
---|
| 106 | }; |
---|
| 107 | |
---|
| 108 | |
---|
| 109 | #endif // _UNIQUE_H_ |
---|