1 files changed, 8 insertions, 0 deletions
diff --git a/src/corelib/io/qlockfile_unix.cpp b/src/corelib/io/qlockfile_unix.cpp
index 667b108ba0..623968b869 100644
--- a/src/corelib/io/qlockfile_unix.cpp
+++ b/src/corelib/io/qlockfile_unix.cpp
@@ -202,6 +202,13 @@ QLockFile::LockError QLockFilePrivate::tryLock_sys()
     // We hold the lock, continue.
     fileHandle = fd;
 
+    // Sync to disk if possible. Ignore errors (e.g. not supported).
+#if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
+    fdatasync(fileHandle);
+#else
+    fsync(fileHandle);
+#endif
+
     return QLockFile::NoError;
 }
 
@@ -283,6 +290,7 @@ QString QLockFilePrivate::processNameByPid(qint64 pid)
     free(proc);
     return name;
 #else
+    Q_UNUSED(pid);
     return QString();
 #endif
 }