1 files changed, 55 insertions, 2 deletions
diff --git a/JavaScriptCore/wtf/MainThread.cpp b/JavaScriptCore/wtf/MainThread.cpp
index 40a4ae5..a041bb2 100644
--- a/JavaScriptCore/wtf/MainThread.cpp
+++ b/JavaScriptCore/wtf/MainThread.cpp
@@ -29,11 +29,15 @@
 #include "config.h"
 #include "MainThread.h"
 
-#include "StdLibExtras.h"
 #include "CurrentTime.h"
 #include "Deque.h"
+#include "StdLibExtras.h"
 #include "Threading.h"
 
+#if PLATFORM(CHROMIUM)
+#error Chromium uses a different main thread implementation
+#endif
+
 namespace WTF {
 
 struct FunctionWithContext {
@@ -52,8 +56,11 @@ struct FunctionWithContext {
 typedef Deque<FunctionWithContext> FunctionQueue;
 
 static bool callbacksPaused; // This global variable is only accessed from main thread.
+#if !PLATFORM(MAC) && !PLATFORM(QT)
+static ThreadIdentifier mainThreadIdentifier;
+#endif
 
-Mutex& mainThreadFunctionQueueMutex()
+static Mutex& mainThreadFunctionQueueMutex()
 {
     DEFINE_STATIC_LOCAL(Mutex, staticMutex, ());
     return staticMutex;
@@ -65,12 +72,51 @@ static FunctionQueue& functionQueue()
     return staticFunctionQueue;
 }
 
+
+#if !PLATFORM(MAC)
+
 void initializeMainThread()
 {
+    static bool initializedMainThread;
+    if (initializedMainThread)
+        return;
+    initializedMainThread = true;
+
+#if !PLATFORM(QT)
+    mainThreadIdentifier = currentThread();
+#endif
+
+    mainThreadFunctionQueueMutex();
+    initializeMainThreadPlatform();
+}
+
+#else
+
+static pthread_once_t initializeMainThreadKeyOnce = PTHREAD_ONCE_INIT;
+
+static void initializeMainThreadOnce()
+{
     mainThreadFunctionQueueMutex();
     initializeMainThreadPlatform();
 }
 
+void initializeMainThread()
+{
+    pthread_once(&initializeMainThreadKeyOnce, initializeMainThreadOnce);
+}
+
+static void initializeMainThreadToProcessMainThreadOnce()
+{
+    mainThreadFunctionQueueMutex();
+    initializeMainThreadToProcessMainThreadPlatform();
+}
+
+void initializeMainThreadToProcessMainThread()
+{
+    pthread_once(&initializeMainThreadKeyOnce, initializeMainThreadToProcessMainThreadOnce);
+}
+#endif
+
 // 0.1 sec delays in UI is approximate threshold when they become noticeable. Have a limit that's half of that.
 static const double maxRunLoopSuspensionTime = 0.05;
 
@@ -152,4 +198,11 @@ void setMainThreadCallbacksPaused(bool paused)
         scheduleDispatchFunctionsOnMainThread();
 }
 
+#if !PLATFORM(MAC) && !PLATFORM(QT)
+bool isMainThread()
+{
+    return currentThread() == mainThreadIdentifier;
+}
+#endif
+
 } // namespace WTF