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1 I117 II I117 PROGRAMMING PRACTICE II 2 MEMORY MANAGEMENT 2 Research Center for Advanced Computing Infrastructure (RCACI) / Yasuhiro Ohara

2 / SCHEDULE /06/07(Tue) / Basic of Programming /06/09(Thu) / Fundamental structures /06/14(Tue) / Memory Management /06/16(Thu) / Memory Management /06/21(Tue) / Debugging /06/23(Thu) / Software Development Env /06/28(Tue) / Software Development Env /06/30(Thu) / Data Structure : Tree /07/05(Tue) / Data Structure: Hash /07/07(Thu) / Understanding Programs /07/12(Tue) / Understanding Programs /07/14(Thu) / Script Language /07/19(Tue) / Script Language /07/21(Thu) / Other Languages /07/26(Tue) / Examination

3 / FINAL REPORT free topic : decide topic by 7/5(Tue) report us of the topic by / Sound file converter / web crawler (CalDAV) calendar program new shell, editor, window manager rsync encrypt/decrypt, rsync markov-chain program choose good theme TAask TA and me The final report must have deep consideration

4 / TODAY'S INDEX / memory management malloc () / fundamental structure / array and linked list / tree, stack, queue

5 MAIN() Exercise: PRINTS MAIN() ARGUMENTS / prints main() arguments.! #include <stdio.h>! int main(int argc, char* argv[])! {! int i;! for(i = 0; i < argc; i++)! {! }! }! printf("argv[%d]: %s\n", i, argv[i]);!

6 / MEMORY MANAGEMENT

7 / ALLOCATE NEW MEMORY #include <stdlib.h> void * malloc (size_t size); void free (void *ptr); malloc: Memory ALLOCate size / allocate "size"- bytes memory and return the pointer. free: malloc () / frees the malloc'ed memory. *) malloc () free / you should free all the unnecessary malloc'ed memory. E.x.) struct listnode *target = (struct listnode *) malloc (sizeof (struct listnode)); free (target);

8 EXERCISE: DYNAMIC ALLOCATION OF 2-D ARRAY malloc() / use malloc() twice.! char array[m][n + 1] / take 2 arguments and create char array[m][n + 1].! array[0] "ABC..." / Fill "ABC..." in array [0].! array[1] "BCD..." / Fill with shifted string like "BCD..." in array[1] and after.! array[x]nul/ Terminate with NUL string in each array[x].! print / print the two arguments.! array[x] print / print each array[x] as one line.!

9 / ANSWER 1. #include <stdio.h>! 2. #include <stdlib.h>! 3. void! 4. main(int argc, char **argv)! 5. {! 6. int m, n;! 7. int i, j;! 8. char **array;! 9. if (argc < 3)! 10. {! 11. printf ("%s <m> <n>\n", argv[0]);! 12. exit (1);! 13. }! 14. m = atoi (argv[1]);! 15. n = atoi (argv[2]);! 1. printf ("m = %d, n = %d\n", m, n);! 2. array = (char **) malloc (m * sizeof (char *));! 3. for (i = 0; i < m; i++)! 4. array[i] = (char *) malloc (n + 1);! 5. for (i = 0; i < m; i++)! 6. {! 7. for (j = 0; j < n; j++)! 8. array[i][j] = 'A' + i + j;! 9. array[i][n] = '\0';! 10. }! 11. for (i = 0; i < m; i++)! 12. printf ("%02d: %s\n", i, array[i]);! 13. }!

10 / MEMORY MANAGEMENT / Dynamic memory allocation / Free-list, Memory-pool / for example, manage constant-size memory chunks in a linked list / reference count (Buddy Memory Allocation) / change size of array doubly each time / garbage collection

11 / ARRAY AND LINKED LIST

12 (ARRAY) N P r o g r a m \0 / two dimension array M

13 (ARRAY) / PROS AND CONS : / the size of the array is static. insert / i delete /

14 (LINKED-LIST)

15 (LINK-LIST) pros : / a list has basically unlimited size cons / need bookkeeping meta- memory

16 ( ) or

17 DOUBLY LINKED LIST unlimited sized, fast insertion and deletion linked with pointers (SingleDoubly) Linked List NULL= =NULL

18 LIST LIMITATION unlimited size NULL= =NULL new =NULL add

19 LIST INSERTION NULL= =NULL new

20 LIST INSERTION NULL= =NULL new

21 LIST INSERTION NULL= =NULL new

22 LIST INSERTION done by manipulation of 4 pointers no shifting of slide is deletion

23 LIST DELETION NULL= =NULL unnecessary

24 LIST DELETION NULL= =NULL unnecessary

25 LIST DELETION NULL= =NULL unnecessary

26 LISTNODE LISTNODE STRUCTURE void * "void *" serves as abstract struct listnode { }; struct listnode *; struct listnode *; void *;

27 INSIDE LIST left-> left-> struct listnode *left; right-> right-> struct listnode *right; to be changed struct listnode *target;

28 () LIST ADDITION EXAMPLE /* left right target left target right */ left-> = target; target-> = left; target-> = right; right-> = target;

29 () LIST DELETION EXAMPLE /* left target right target left right */ left-> = right; right-> = left; /* left right target */ target->-> = target->; target->-> = target->;

30 LIST LIST STRUCTURE struct list { struct listnode *head; /* */ struct listnode *tail; /* */ int count; /* */ };

31 POINTER MANIPULATION

32 EXERCISE: ARRAY MODIFICATION PROGRAM / Has one array inside! / the array is variable length! (fgets) / input one line from stdin! "add " + <string> + '\n'! "remove " + <string> + '\n'! "add " + <num> + <string> + '\n'! ignore rest.! / After each inputs, print the length of array and its contents.!

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