Race condition in circle radius #756

tex/generic/pgf/frontendlayer/tikz/tikz.code.tex

@@ -283,7 +283,13 @@
 % Radii and arc options
 \tikzset{x radius/.initial=0pt}%
 \tikzset{y radius/.initial=0pt}%
-\tikzset{radius/.style={/tikz/x radius=#1,/tikz/y radius=#1}}%
+\tikzset{%
+  radius/.code={%
+    \pgfmathparse{#1}%
+    \pgfkeyssetevalue{/tikz/x radius}{\pgfmathresult}%
+    \pgfkeyssetevalue{/tikz/y radius}{\pgfmathresult}%
+  }%
+}%
 \tikzset{start angle/.initial=}%
 \tikzset{end angle/.initial=}%
 \tikzset{delta angle/.initial=}%
@@ -3616,7 +3622,7 @@
     \tikzset{every circle/.try,#1}%
     \pgftransformshift{\tikz@node@at}%
     \tikz@transform%
-    \tikz@do@circle{\pgfkeysvalueof{/tikz/x radius}}{\pgfkeysvalueof{/tikz/y radius}}
+    \tikz@do@ellipse{\pgfkeysvalueof{/tikz/x radius}}{\pgfkeysvalueof{/tikz/y radius}}
   }%
   \tikz@scan@next@command%
 }%
@@ -3628,15 +3634,28 @@
     \ifpgfutil@in@%
       \tikz@@ellipseB(#1)%
     \else%
-      \tikz@do@circle{#1}{#1}%
+      \tikz@do@circle{#1}%
     \fi%
   }%
   \tikz@scan@next@command%
 }%
 \def\tikz@@ellipseB(#1 and #2){%
-  \tikz@do@circle{#1}{#2}
+  \tikz@do@ellipse{#1}{#2}%
 }%
-\def\tikz@do@circle#1#2{
+\def\tikz@do@circle#1{%
+  \pgfmathparse{#1}%
+  \let\tikz@ellipse@x=\pgfmathresult
+  \ifpgfmathunitsdeclared
+    \pgfpathellipse{\pgfpointorigin}%
+      {\pgfqpoint{\tikz@ellipse@x pt}{0pt}}%
+      {\pgfpoint{0pt}{\tikz@ellipse@x pt}}%
+  \else
+    \pgfpathellipse{\pgfpointorigin}%
+      {\pgfpointxy{\tikz@ellipse@x}{0}}%
+      {\pgfpointxy{0}{\tikz@ellipse@x}}%
+  \fi
+}
+\def\tikz@do@ellipse#1#2{
   \pgfmathparse{#1}%
   \let\tikz@ellipse@x=\pgfmathresult%
   \ifpgfmathunitsdeclared%