Serialize DNS lookups

From: Christian Prochaska <christian.prochaska@genode-labs.com>

'getaddrinfo()' is currently not thread-safe on Genode
---
 src/network/kernel/qhostinfo.cpp |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/network/kernel/qhostinfo.cpp b/src/network/kernel/qhostinfo.cpp
index 4a5589d..6725d43 100644
--- a/src/network/kernel/qhostinfo.cpp
+++ b/src/network/kernel/qhostinfo.cpp
@@ -543,7 +543,12 @@ QHostInfoLookupManager::QHostInfoLookupManager() : mutex(QMutex::Recursive), was
 {
     moveToThread(QCoreApplicationPrivate::mainThread());
     connect(QCoreApplication::instance(), SIGNAL(destroyed()), SLOT(waitForThreadPoolDone()), Qt::DirectConnection);
+#ifdef Q_OS_GENODE
+    /* 'getaddrinfo()' is currently not thread-safe on Genode */
+    threadPool.setMaxThreadCount(1);
+#else
     threadPool.setMaxThreadCount(5); // do 5 DNS lookups in parallel
+#endif
 }
 
 QHostInfoLookupManager::~QHostInfoLookupManager()