C언어 메모리 해제 관련 질문 좀 드립니다.

  1 #include <unistd.h>
  2 #include <stdio.h>
  3 #include <stdlib.h>
  4 #include <string.h>
  5 #include <malloc.h>
  6 
  7 #define MAX_MEM_SIZE    500
  8 // #define MEM_COUNT    5000
  9 #define MEM_COUNT    4000
 10 
 11 int main()
 12 {
 13     char *mem[MEM_COUNT];
 14 
 15     printf("Starting malloc... %d & %d = %dm\n", MAX_MEM_SIZE*1024*1024 / MEM_COUNT, MEM_COUNT, MAX_MEM_SIZE);
 16     for (unsigned int i=0; i<MEM_COUNT; i++) {
 17         mem[i] = (char *)malloc(MAX_MEM_SIZE*1024*1024 / MEM_COUNT);
 18         memset(mem[i], 0, MAX_MEM_SIZE*1024*1024 / MEM_COUNT);
 19     }
 20     printf("Done.\n");
 21 
 22     char *mem2 = new char[MAX_MEM_SIZE*1024*1024 / MEM_COUNT];
 23     sleep(10);
 24 
 25 
 26     printf("Starting free...\n");
 27     for (unsigned int i=0; i<MEM_COUNT; i++) {
 28         free( mem[i] );
 29         mem[i] = NULL;
 30     }
 31 
 32     printf("free(mem) Done.\n");
 33     sleep(15);
 34 
 35     // free(mem2);
 36     // printf("free(mem2) Done.\n");
 37     // sleep(15);
 38 }