Use spin-locks for short-lived, non-recursive locking sequences

src/visual/WaterfallCanvas.cpp

@@ -88,7 +88,7 @@ void WaterfallCanvas::attachSpectrumCanvas(SpectrumCanvas *canvas_in) {
 }
 
 void WaterfallCanvas::processInputQueue() {
-    std::lock_guard < std::mutex > lock(tex_update);
+    std::lock_guard < SpinMutex > lock(tex_update);
     
     gTimer.update();
     
@@ -127,7 +127,7 @@ void WaterfallCanvas::processInputQueue() {
 }
 
 void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
-    std::lock_guard < std::mutex > lock(tex_update);
+    std::lock_guard < SpinMutex > lock(tex_update);
     wxPaintDC dc(this);
     
     const wxSize ClientSize = GetClientSize();
@@ -913,7 +913,7 @@ void WaterfallCanvas::updateCenterFrequency(long long freq) {
 }
 
 void WaterfallCanvas::setLinesPerSecond(int lps) {
-    std::lock_guard < std::mutex > lock(tex_update);
+    std::lock_guard < SpinMutex > lock(tex_update);
     
     linesPerSecond = lps;
 

src/visual/WaterfallCanvas.h

@@ -14,6 +14,7 @@
 #include "SpectrumCanvas.h"
 #include "WaterfallPanel.h"
 #include "Timer.h"
+#include "SpinMutex.h"
 
 class WaterfallCanvas: public InteractiveCanvas {
 public:
@@ -93,7 +94,7 @@ private:
     Timer gTimer;
     double lpsIndex;
     bool preBuf;
-    std::mutex tex_update;
+    SpinMutex tex_update;
     int minBandwidth;
     std::atomic_bool fft_size_changed;
     // event table