There is a problem with the free() function,it doesn't work on my computer.
test source code:

#include <stdio.h>
#include <malloc.h>

int main(){
char *p;
getch();
p=(char*)malloc(1024*1024*1024);
printf("size=%u\n",_msize(p));
for (size_t n=0;n<1024*1024*1024;n++)
p[n]='C';
puts("1G,Ok!");
getch();
free(p);
puts("After free!");
//process still use 1G memory
getch();
}


I'm sorry about my poor English,I'm a student in middle school of China.

Den 03-08-2011 04:02, Freedon skrev:
> There is a problem with the free() function,it doesn't work on my computer.
> test source code:
>
> #include<stdio.h>
> #include<malloc.h>
>
> int main(){
> char *p;
> getch();
> p=(char*)malloc(1024*1024*1024);
> printf("size=%u\n",_msize(p));
> for (size_t n=0;n<1024*1024*1024;n++)
> p[n]='C';
> puts("1G,Ok!");
> getch();
> free(p);
> puts("After free!");
> //process still use 1G memory
> getch();
> }
>
>
> I'm sorry about my poor English,I'm a student in middle school of China.

The free function does most likely work, but once memory has
been allocated to your process, the memory is not normally
given back to the OS. Try to run the code above in a loop, the
memory usage will most probably not increase after the first
iteration.