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-rw-r--r--src/corelib/io/qfiledevice.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/corelib/io/qfiledevice.cpp b/src/corelib/io/qfiledevice.cpp
index 4e508e6597..90b67a22e3 100644
--- a/src/corelib/io/qfiledevice.cpp
+++ b/src/corelib/io/qfiledevice.cpp
@@ -109,6 +109,11 @@ void QFileDevicePrivate::setError(QFileDevice::FileError err, int errNum)
decrementing \c qt_ntfs_permission_lookup by 1.
\snippet ntfsp.cpp 1
+
+ \note Since this is a non-atomic global variable, it is only safe
+ to increment or decrement \c qt_ntfs_permission_lookup before any
+ threads other than the main thread have started or after every thread
+ other than the main thread has ended.
*/
//************* QFileDevice