這個 clearpool 怎么寫 ?

mjus

#include<stdio.h>
#include<stdlib.h>
typedef struct _anyT {
int val;
} anyT;

#define UNITS 10

typedef union _data_block {
                union _data_block *next;
                anyT the_type;

} data_block;

static data_block *free_list = NULL;

static void moremem(void) {
  int i;
  data_block *more = calloc(sizeof(data_block),UNITS);
  for(i = 0; i < UNITS; i++) {
        more[i].next = free_list;
        free_list = more + i;
  }
}

anyT *allocanyT(void) {
  data_block *current;
  if(free_list == NULL) {
        moremem();
        return allocanyT();
  }
  current = free_list;
  free_list = free_list->next;
  return &(current->the_type);

}

void freeanyT(anyT *x)
{
  ((data_block *)x)->next = free_list;
  free_list = (data_block *)x;
}

void clearpool() {  
data_block *head;
anyT* cur;
for(head=free_list;head;head=free_list) {
    free_list=free_list->next;
    cur=(anyT*)&head->the_type;
    free(cur);
}
}

#define MAX 100
int main() {
anyT* arr[MAX];
int i;

for(i=0; i<MAX; i++)
  arr[i]=allocanyT();

clearpool();
}

如上所見, function clearppool 沒有真正清除 pool 里的 objects, 怎樣做才對呢?

yihai-0494

在moremem中: 調(diào)用 malloc UNITS 次然后連接起來試試

mjus

static void moremem(void) {
  int i;
  data_block *more = calloc(sizeof(data_block),UNITS);
  for(i = 0; i < UNITS; i++) {
        more[i].next = free_list; //<<<
        free_list = more + i;       //<<<
  }
}

連接起來了阿！不是嗎？