From c06048a7af347bf843bf25bd305cbbf4d6cec266 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Thu, 21 Feb 2019 19:29:28 +0100
Subject: do less global memory fences in atomics

---
 pose-widget/pose-widget.cpp | 9 ++++-----
 pose-widget/pose-widget.hpp | 2 +-
 2 files changed, 5 insertions(+), 6 deletions(-)

(limited to 'pose-widget')

diff --git a/pose-widget/pose-widget.cpp b/pose-widget/pose-widget.cpp
index 943fc0ad..e9bf1d01 100644
--- a/pose-widget/pose-widget.cpp
+++ b/pose-widget/pose-widget.cpp
@@ -62,7 +62,7 @@ void pose_transform::run()
         {
             lock_guard l(mtx);
 
-            if (fresh)
+            if (fresh.load(std::memory_order_relaxed))
                 goto end;
 
             rotation = rotation_;
@@ -88,8 +88,7 @@ void pose_widget::rotate_async(double xAngle, double yAngle, double zAngle, doub
     if (!check_is_visible())
         return;
 
-    bool expected = true;
-    if (xform.fresh.compare_exchange_weak(expected, false))
+    if (bool X = true; xform.fresh.compare_exchange_weak(X, false, std::memory_order_relaxed))
     {
         repaint();
         xform.rotate_async(xAngle, yAngle, zAngle, x, y, z);
@@ -266,7 +265,7 @@ void pose_transform::project_quad_texture()
     {
         lock_guard l(mtx2);
         image.swap(image2);
-        fresh = true;
+        fresh.store(true, std::memory_order_relaxed);
         return;
     }
 
@@ -358,7 +357,7 @@ void pose_transform::project_quad_texture()
     {
         lock_guard l2(mtx2);
         image.swap(image2);
-        fresh = true;
+        fresh.store(true, std::memory_order_relaxed);
     }
 }
 
diff --git a/pose-widget/pose-widget.hpp b/pose-widget/pose-widget.hpp
index aa51957e..1e50b392 100644
--- a/pose-widget/pose-widget.hpp
+++ b/pose-widget/pose-widget.hpp
@@ -84,7 +84,7 @@ struct pose_transform final : QThread
     };
 
     std::vector<uv_> uv_vec;
-    std::atomic<bool> fresh{false};
+    std::atomic<bool> fresh = false;
 
     static constexpr int w = 320, h = 240;
 };
-- 
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