Synchronize multiple open commands coming together.

Author: cmaglie

serialport.go

@@ -20,6 +20,7 @@ import (
 	"encoding/base64"
 	"io"
 	"strconv"
+	"sync"
 	"sync/atomic"
 	"time"
 	"unicode/utf8"
@@ -273,7 +274,11 @@ func (p *serport) writerRaw() {
 	h.broadcastSys <- []byte(msgstr)
 }
 
+var spHandlerLock sync.Mutex
+
 func spHandlerOpen(portname string, baud int, buftype string) {
+	spHandlerLock.Lock()
+	defer spHandlerLock.Unlock()
 
 	log.Print("Inside spHandler")