Change the thread interface in runtime/platform and use it starting all threads

runtime/platform/thread.h

Index: runtime/platform/thread.h
diff --git a/runtime/platform/thread.h b/runtime/platform/thread.h
index 0eb8da13b2b502412cc21ac54951290785a4a64e..931539543c2e8dc0adb6bffa95640498c00c1196 100644
--- a/runtime/platform/thread.h
+++ b/runtime/platform/thread.h
@@ -22,17 +22,15 @@ namespace dart {
 
 class Thread {
  public:
-  // Function to be called on thread start.
-  typedef void (*ThreadStartFunction) (uword parameter);
-
-  // TODO(iposva): Define the proper interface for spawning and killing threads.
-  Thread(ThreadStartFunction function, uword parameters);
-  ~Thread();
+  static const int64_t kNoTimeout = 0;
+  static const ThreadHandle kInvalidThreadHandle;
 
- private:
-  ThreadData data_;
+  typedef void (*ThreadStartFunction) (uword parameter);
 
-  DISALLOW_COPY_AND_ASSIGN(Thread);
+  // Start a thread running the specified function.
+  static ThreadHandle Start(ThreadStartFunction function, uword parameters);
+  // Wait for thread termination or timeout.
+  static bool Join(ThreadHandle thread, int64_t millis = kNoTimeout);

[Mads Ager (google), 2012/01/20 12:35:34]

Do you need the timeout version of this. I don't see anything in this change
that needs it. Since it is unimplemented on Mac in this change I think we should
leave it out.

[Søren Gjesse, 2012/01/20 13:25:45]

Good point, removed.

 };