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package graph
import "sync"
type entry struct {
data interface{}
next *entry
}
type Stack struct {
lock *sync.Mutex
head *entry
Size int
}
func (stk *Stack) Push(data interface{}) {
stk.lock.Lock()
element := new(entry)
element.data = data
temp := stk.head
element.next = temp
stk.head = element
stk.Size++
stk.lock.Unlock()
}
func (stk *Stack) Pop() interface{} {
if stk.head == nil {
return nil
}
stk.lock.Lock()
r := stk.head.data
stk.head = stk.head.next
stk.Size--
stk.lock.Unlock()
return r
}
func NewStack() *Stack {
stk := new(Stack)
stk.lock = &sync.Mutex{}
return stk
}
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