From 012c7d00d24ff983c135444da1c21f54eef9b48f Mon Sep 17 00:00:00 2001
From: ed <eddavies95@gmail.com>
Date: Wed, 7 Aug 2019 12:44:42 +0100
Subject: [PATCH] Linux:  Fix for high CPU load

---
 .../native/juce_linux_Messaging.cpp           |  2 +-
 .../native/juce_linux_X11_Windowing.cpp       | 20 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/modules/juce_events/native/juce_linux_Messaging.cpp b/modules/juce_events/native/juce_linux_Messaging.cpp
index 33bfbadad4..9f20e95b45 100644
--- a/modules/juce_events/native/juce_linux_Messaging.cpp
+++ b/modules/juce_events/native/juce_linux_Messaging.cpp
@@ -124,7 +124,7 @@ public:
         const ScopedLock sl (lock);
 
         fdReadCallbacks.push_back ({ fd, std::move (cb) });
-        pfds.push_back ({ fd, POLLIN | POLLOUT, 0 });
+        pfds.push_back ({ fd, POLLIN, 0 });
     }
 
     void unregisterFdCallback (int fd)
diff --git a/modules/juce_gui_basics/native/juce_linux_X11_Windowing.cpp b/modules/juce_gui_basics/native/juce_linux_X11_Windowing.cpp
index 00de9d6b89..40e5e1ccd8 100644
--- a/modules/juce_gui_basics/native/juce_linux_X11_Windowing.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_X11_Windowing.cpp
@@ -1661,7 +1661,7 @@ public:
                 if (XSHMHelpers::isShmAvailable (display))
                 {
                     ScopedXLock xlock (display);
-                    if (event.xany.type == XShmGetEventBase (display))
+                    if (event.xany.type == shmCompletionEvent)
                         repainter->notifyPaintCompleted();
                 }
                #endif
@@ -2269,6 +2269,15 @@ private:
         void timerCallback() override
         {
            #if JUCE_USE_XSHM
+            if (shmPaintsPending != 0)
+            {
+                ScopedXLock xlock (display);
+
+                XEvent evt;
+                while (XCheckTypedWindowEvent (display, peer.windowH, peer.shmCompletionEvent, &evt))
+                    --shmPaintsPending;
+            }
+
             if (shmPaintsPending != 0)
                 return;
            #endif
@@ -2399,6 +2408,10 @@ private:
     enum { KeyPressEventType = 2 };
     static ::Display* display;
 
+   #if JUCE_USE_XSHM
+    int shmCompletionEvent = 0;
+   #endif
+
     struct MotifWmHints
     {
         unsigned long flags;
@@ -2728,6 +2741,11 @@ private:
 
         initialisePointerMap();
         updateModifierMappings();
+
+       #if JUCE_USE_XSHM
+        if (XSHMHelpers::isShmAvailable (display))
+            shmCompletionEvent = XShmGetEventBase (display) + ShmCompletion;
+       #endif
     }
 
     void destroyWindow()