1 files changed, 14 insertions, 1 deletions
diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index 145f44d6e8c..4f163688f2c 100644
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -953,6 +953,18 @@ driSetBackgroundContext(void *loaderPrivate)
    __glXSetCurrentContext(&pcp->base);
 }
 
+static GLboolean
+driIsThreadSafe(void *loaderPrivate)
+{
+   struct dri2_context *pcp = (struct dri2_context *) loaderPrivate;
+   /* Check Xlib is running in thread safe mode
+    *
+    * 'lock_fns' is the XLockDisplay function pointer of the X11 display 'dpy'.
+    * It wll be NULL if XInitThreads wasn't called.
+    */
+   return pcp->base.psc->dpy->lock_fns != NULL;
+}
+
 static const __DRIdri2LoaderExtension dri2LoaderExtension = {
    .base = { __DRI_DRI2_LOADER, 3 },
 
@@ -974,9 +986,10 @@ static const __DRIuseInvalidateExtension dri2UseInvalidate = {
 };
 
 static const __DRIbackgroundCallableExtension driBackgroundCallable = {
-   .base = { __DRI_BACKGROUND_CALLABLE, 1 },
+   .base = { __DRI_BACKGROUND_CALLABLE, 2 },
 
    .setBackgroundContext    = driSetBackgroundContext,
+   .isThreadSafe            = driIsThreadSafe,
 };
 
 _X_HIDDEN void