code review 4817058: runtime: fix data race in findfunc()

src/pkg/runtime/arm/atomic.c

Index: src/pkg/runtime/arm/atomic.c
===================================================================
--- a/src/pkg/runtime/arm/atomic.c
+++ b/src/pkg/runtime/arm/atomic.c
@@ -68,3 +68,16 @@
 			return;
 	}
 }
+
+#pragma textflag 7
+void
+runtime·atomicstore(uint32 volatile* addr, uint32 v)
+{
+	uint32 old;
+	
+	for(;;) {
+		old = *addr;
+		if(runtime·cas(addr, old, v))
+			return;
+	}
+}