4 files changed, 22 insertions, 0 deletions
diff --git a/WebCore/bindings/js/ScriptController.cpp b/WebCore/bindings/js/ScriptController.cpp
index 6de9b75..45f8c75 100644
--- a/WebCore/bindings/js/ScriptController.cpp
+++ b/WebCore/bindings/js/ScriptController.cpp
@@ -38,12 +38,18 @@
 #include "npruntime_impl.h"
 #include "runtime_root.h"
 #include <debugger/Debugger.h>
+#include <runtime/InitializeThreading.h>
 #include <runtime/JSLock.h>
 
 using namespace JSC;
 
 namespace WebCore {
 
+void ScriptController::initializeThreading()
+{
+    JSC::initializeThreading();
+}
+
 ScriptController::ScriptController(Frame* frame)
     : m_frame(frame)
     , m_handlerLineNumber(0)
diff --git a/WebCore/bindings/js/ScriptController.h b/WebCore/bindings/js/ScriptController.h
index 56e8f0c..9ae10fb 100644
--- a/WebCore/bindings/js/ScriptController.h
+++ b/WebCore/bindings/js/ScriptController.h
@@ -80,6 +80,10 @@ public:
         return m_windowShell->window();
     }
 
+    // This function must be called from the main thread. It is safe to call it repeatedly.
+    // Darwin is an exception to this rule: it is OK to call this function from any thread, even reentrantly.
+    static void initializeThreading();
+
     ScriptValue evaluate(const ScriptSourceCode&);
     void evaluateInIsolatedWorld(unsigned worldID, const Vector<ScriptSourceCode>&);
 
diff --git a/WebCore/bindings/v8/ScriptController.cpp b/WebCore/bindings/v8/ScriptController.cpp
index d2c1db2..85af072 100644
--- a/WebCore/bindings/v8/ScriptController.cpp
+++ b/WebCore/bindings/v8/ScriptController.cpp
@@ -60,6 +60,15 @@
 
 namespace WebCore {
 
+void ScriptController::initializeThreading()
+{
+    static bool initializedThreading = false;
+    if (!initializedThreading) {
+        WTF::initializeThreading();
+        initializedThreading = true;
+    }
+}
+
 void ScriptController::setFlags(const char* string, int length)
 {
     v8::V8::SetFlagsFromString(string, length);
diff --git a/WebCore/bindings/v8/ScriptController.h b/WebCore/bindings/v8/ScriptController.h
index 9658b05..ec15103 100644
--- a/WebCore/bindings/v8/ScriptController.h
+++ b/WebCore/bindings/v8/ScriptController.h
@@ -59,6 +59,9 @@ namespace WebCore {
         // or this accessor should be made JSProxy*
         V8Proxy* proxy() { return m_proxy.get(); }
 
+        // This function must be called from the main thread. It is safe to call it repeatedly.
+        static void initializeThreading();
+
         // Evaluate a script file in the environment of this proxy.
         // If succeeded, 'succ' is set to true and result is returned
         // as a string.