get rid of "volatile" abuse

We heavily used "volatile bool" to check if the thread
loop should stop. But this functionality is already
provided by Qt5's QThread::requestInterruption.

In other cases, "volatile" is wonderfully
underspecified so it's better to ditch its usage in
favor of std::atomic<t>. At the time we don't appear to
be using the "volatile" keyword except when calling
win32's Interlocked*() family of functions as
necessary.

In freetrackclient's header the "volatile" qualifier
was used as part of a typedef. This doesn't work. Use
it as part of data declaration.

2 files changed, 5 insertions, 7 deletions

diff --git a/dinput/keybinding-worker.cpp b/dinput/keybinding-worker.cpp
index 0357752c..41fa3486 100644
--- a/dinput/keybinding-worker.cpp
+++ b/dinput/keybinding-worker.cpp
@@ -28,7 +28,7 @@ KeybindingWorker::~KeybindingWorker()
 {
     qDebug() << "exit: keybinding worker";
 
-    should_quit = true;
+    requestInterruption();
     wait();
     if (dinkeyboard) {
         dinkeyboard->Unacquire();
@@ -74,11 +74,10 @@ bool KeybindingWorker::init()
     return true;
 }
 
-KeybindingWorker::KeybindingWorker() : dinkeyboard(nullptr), din(dinput_handle::make_di()), should_quit(false)
+KeybindingWorker::KeybindingWorker() : dinkeyboard(nullptr), din(dinput_handle::make_di())
 {
-    should_quit = !init();
-
-    start();
+    if (init())
+        start();
 }
 
 KeybindingWorker& KeybindingWorker::make()
@@ -92,7 +91,7 @@ void KeybindingWorker::run()
     unsigned char keystate[256] = {0};
     unsigned char old_keystate[256] = {0};
 
-    while (!should_quit)
+    while (!isInterruptionRequested())
     {
         {
             QMutexLocker l(&mtx);
diff --git a/dinput/keybinding-worker.hpp b/dinput/keybinding-worker.hpp
index 553a314c..6ed277cd 100644
--- a/dinput/keybinding-worker.hpp
+++ b/dinput/keybinding-worker.hpp
@@ -48,7 +48,6 @@ private:
     QMutex mtx;
     QMainWindow fake_main_window;
     dinput_handle::di_t din;
-    volatile bool should_quit;
 
     void run() override;
     bool init();