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#include <u.h>
#include <libc.h>
typedef struct Node Node;
struct Node {
int n;
Node *next;
};
Node *head, *tail;
void *
emalloc(ulong n)
{
void *p;
p = malloc(n);
if(p == nil)
sysfatal("malloc: %r");
memset(p, 0, n);
setmalloctag(p, getcallerpc(&n));
return p;
}
void
put(int n)
{
if(tail == nil){
tail = emalloc(sizeof(Node));
tail->n = n;
head = tail;
return;
}
tail->next = emalloc(sizeof(Node));
tail = tail->next;
tail->n = n;
}
int
get(void)
{
Node *nn;
int n;
if(head == nil)
return -1;
nn = head->next;
n = head->n;
free(head);
head = nn;
return n;
}
int
isemtpy(void)
{
return head == nil;
}
void
main()
{
int i;
for(i = 0; i < 10; i++)
put(i*3);
while(!isemtpy())
print("%d\n", get());
exits(nil);
}
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