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rw.go
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rw.go
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package main
import (
"fmt"
"sync"
"time"
)
type list struct {
m sync.RWMutex
value []string
}
func (l *list) contains(v string) bool {
for _, s := range l.value {
if s == v {
return true
}
}
return false
}
func (l *list) Len() int {
l.m.RLock()
v := len(l.value)
l.m.RUnlock()
return v
}
func (l *list) Contains(v string) bool {
l.m.RLock()
found := l.contains(v)
l.m.RUnlock()
return found
}
func (l *list) Add(v string) bool {
l.m.Lock()
defer l.m.Unlock()
if l.contains(v) {
return false
}
l.value = append(l.value, v)
return true
}
func main() {
var src = []string{
"Ryu", "Ken", "E. Honda", "Guile",
"Chun-Li", "Blanka", "Zangief", "Dhalsim",
}
var l list
for i := 0; i < 10; i++ {
go func(i int) {
for _, s := range src {
go func(s string) {
if !l.Contains(s) {
if l.Add(s) {
fmt.Println(i, "add", s)
} else {
fmt.Println(i, "too slow", s)
}
}
}(s)
}
}(i)
}
time.Sleep(500 * time.Millisecond)
}