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Administering a heap of H bytes Address = 0Address = H - 1 Free List Pointer :

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Presentation on theme: "Administering a heap of H bytes Address = 0Address = H - 1 Free List Pointer :"— Presentation transcript:

1 Administering a heap of H bytes Address = 0Address = H - 1 Free List Pointer :

2 Initial Layout Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: H-4 Address = 4

3 26 After program requests block of size 26 Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 34 H-34

4 26 After program requests blocks of sizes 10, 2, 18, H-78 Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 78 104 18 Minimum block size=4 bytes (null) H-78

5 26 After program frees one block Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 78 104 18 Minimum block size=4 bytes H-78

6 26 After program frees a second block (free() uses LIFO policy) Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 78 104 18 Minimum block size=4 bytes H-78

7 26 After program requests a block of size 8 (free block is split) Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 78 104 8H-78 Minimum block size=4 bytes 6

8 26 Program frees a block (free() uses LIFO policy – interim position) Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 78 104 8H-78 Minimum block size=4 bytes 6

9 40 Program frees a block (free() uses LIFO policy – final position) Address = 0Address = H - 1 Free List Pointer : Key: Free block: Live block: Block header: Address = 4Address = 78 4 8H-78 Minimum block size=4 bytes 6


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