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Protect map with a mutex #1

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Protect map with a mutex #1

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10 changes: 9 additions & 1 deletion memg.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,10 +8,14 @@ import (
"os"
"strconv"
"strings"
"sync"
//"runtime/pprof" // Uncomment to profile
)

var CACHE map[string]string
var (
mu sync.RWMutex
CACHE map[string]string
)

func main() {

Expand Down Expand Up @@ -87,7 +91,9 @@ func handleConn(conn net.Conn) {

case "get":
key := parts[1]
mu.RLock()
val, ok := CACHE[key]
mu.RUnlock()
if ok {
length := strconv.Itoa(len(val))
conn.Write([]uint8("VALUE " + key + " 0 " + length + "\r\n"))
Expand All @@ -103,7 +109,9 @@ func handleConn(conn net.Conn) {
// Really we should read exactly 'length' bytes + \r\n
val := make([]byte, length)
reader.Read(val)
mu.Lock()
CACHE[key] = string(val)
mu.Unlock()
conn.Write([]uint8("STORED\r\n"))
}
}
Expand Down