diff options
Diffstat (limited to 'src/dbus/qdbusconnection.cpp')
| -rw-r--r-- | src/dbus/qdbusconnection.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/dbus/qdbusconnection.cpp b/src/dbus/qdbusconnection.cpp index f95cc3a15d..da7557d7e8 100644 --- a/src/dbus/qdbusconnection.cpp +++ b/src/dbus/qdbusconnection.cpp @@ -69,6 +69,10 @@ QT_BEGIN_NAMESPACE +#ifdef Q_OS_WIN +static void preventDllUnload(); +#endif + Q_GLOBAL_STATIC(QDBusConnectionManager, _q_manager) struct QDBusConnectionManager::ConnectionRequestData @@ -139,6 +143,10 @@ QDBusConnectionManager::QDBusConnectionManager() this, &QDBusConnectionManager::createServer, Qt::BlockingQueuedConnection); moveToThread(this); // ugly, don't do this in other projects +#ifdef Q_OS_WIN + // prevent the library from being unloaded on Windows. See comments in the function. + preventDllUnload(); +#endif defaultBuses[0] = defaultBuses[1] = Q_NULLPTR; start(); } @@ -1262,4 +1270,31 @@ QByteArray QDBusConnection::localMachineId() QT_END_NAMESPACE +#ifdef Q_OS_WIN +# include <qt_windows.h> + +QT_BEGIN_NAMESPACE +static void preventDllUnload() +{ + // Thread termination is really wacky on Windows. For some reason we don't + // understand, exiting from the thread may try to unload the DLL. Since the + // QDBusConnectionManager thread runs until the DLL is unloaded, we've got + // a deadlock: the main thread is waiting for the manager thread to exit, + // but the manager thread is attempting to acquire a lock to unload the DLL. + // + // We work around the issue by preventing the unload from happening in the + // first place. + // + // For this trick, see + // https://blogs.msdn.microsoft.com/oldnewthing/20131105-00/?p=2733 + + static HMODULE self; + GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | + GET_MODULE_HANDLE_EX_FLAG_PIN, + reinterpret_cast<const wchar_t *>(&self), // any address in this DLL + &self); +} +QT_END_NAMESPACE +#endif + #endif // QT_NO_DBUS |