Fix autotest not to open too many files on a Unix

tst_QSharedPointer can't create a pipe as the OS has too many files
open. Systems like macOS have a lower limit to these simultaneous files
open.

Task-number: QTBUG-60410
Change-Id: I21e89f992ada2a7d09b706522a05b5952f00ec33
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/qsharedpointer/tst_qsharedpointer.cpp b/tests/auto/corelib/tools/qsharedpointer/tst_qsharedpointer.cpp
index 7850478602..442d4d089c 100644
--- a/tests/auto/corelib/tools/qsharedpointer/tst_qsharedpointer.cpp
+++ b/tests/auto/corelib/tools/qsharedpointer/tst_qsharedpointer.cpp
@@ -43,6 +43,10 @@
 #include <stdlib.h>
 #include <time.h>
 
+#ifdef Q_OS_UNIX
+#include <sys/resource.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 namespace QtSharedPointer {
     Q_CORE_EXPORT void internalSafetyCheckCleanCheck();
@@ -54,6 +58,7 @@ class tst_QSharedPointer: public QObject
     Q_OBJECT
 
 private slots:
+    void initTestCase();
     void basics_data();
     void basics();
     void operators();
@@ -118,6 +123,20 @@ public:
     }
 };
 
+void tst_QSharedPointer::initTestCase()
+{
+#if defined(Q_OS_UNIX)
+    // The tests create a lot of threads, which require file descriptors. On systems like
+    // OS X low defaults such as 256 as the limit for the number of simultaneously
+    // open files is not sufficient.
+    struct rlimit numFiles;
+    if (getrlimit(RLIMIT_NOFILE, &numFiles) == 0 && numFiles.rlim_cur < 1024) {
+        numFiles.rlim_cur = qMin(rlim_t(1024), numFiles.rlim_max);
+        setrlimit(RLIMIT_NOFILE, &numFiles);
+    }
+#endif
+}
+
 template<typename T> static inline
 QtSharedPointer::ExternalRefCountData *refCountData(const QSharedPointer<T> &b)
 {