File fix_nvidia.patch of Package kwin5

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File fix_nvidia.patch of Package kwin5 (Revision 36fa3dea1411e95262cf93d64cd606f4)

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From: Simeon Bird <sbird@andrew.cmu.edu>
Date: Sat, 21 Mar 2015 00:18:46 +0000
Subject: Fix hang on nvidia hardware when deleting sync objects
---
Fix hang on nvidia hardware when deleting sync objects

When a sync object is deleted, the fence it is connected to must already
be signalled, or the driver will busy-wait forever.
Signal fences before deleting syncs to avoid this.

BUG: 343551
FIXED-IN: 5.3
REVIEW: 123090
---

--- a/scene_opengl.cpp
+++ b/scene_opengl.cpp
@@ -120,6 +120,17 @@
 
 SyncObject::~SyncObject()
 {
+    // If glDeleteSync is called before the xcb fence is signalled
+    // the nvidia driver (the only one to implement GL_SYNC_X11_FENCE_EXT)
+    // deadlocks waiting for the fence to be signalled.
+    // To avoid this, make sure the fence is signalled before 
+    // deleting the sync.
+    if (m_state == Resetting || m_state == Ready){
+        trigger();
+        // The flush is necessary! 
+        // The trigger command needs to be sent to the X server 
+        xcb_flush(connection());
+    }
     xcb_sync_destroy_fence(connection(), m_fence);
     glDeleteSync(m_sync);

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File fix_nvidia.patch of Package kwin5 (Revision 36fa3dea1411e95262cf93d64cd606f4)

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