diff --git a/src/core/appcgroup.cpp b/src/core/appcgroup.cpp
index 12d08ac..5a055cb 100644
--- a/src/core/appcgroup.cpp
+++ b/src/core/appcgroup.cpp
@@ -30,11 +30,7 @@ AppCGroup::AppCGroup(QObject *parent)
 QString AppCGroup::createProcessCGroup(const QString &appId, const QList<int> &pids)
 {
     auto reply = m_processManagerInterface->CreateProcessCGroup(appId, pids);
-    qDebug() << "reply is finished. " << reply.isFinished();
-    while (!reply.isFinished()) {
-        qApp->processEvents();
-        usleep(10);
-    }
+    reply.waitForFinished();
     if (reply.isError()) {
         qWarning() << "createProcessCGroup error, " << reply.error();
         return QString();
@@ -76,10 +72,7 @@ bool AppCGroup::reclaimProcesses(const QString &cgroupName)
 QString AppCGroup::cgroupNameWithPid(int pid)
 {
     auto reply = m_processManagerInterface->CGroupNameWithPid(pid);
-    while (!reply.isFinished()) {
-        qApp->processEvents();
-        usleep(1);
-    }
+    reply.waitForFinished();
     if (reply.isError()) {
         qWarning() << __FUNCTION__ << "error, " << reply.error();
         return QString();