* thread.h (pthread::equal): New static method.

* thread.cc: Rename pthread_equal to pthread::equal throughout.
(pthread_equal): Use pthread::equal to compare threads ids.

winsup/cygwin/thread.h

@@ -438,6 +438,11 @@ public:
 
   virtual unsigned long getsequence_np();
 
+  static int equal (pthread_t t1, pthread_t t2)
+  {
+    return t1 == t2;
+  }
+
 private:
   DWORD thread_id;
   __pthread_cleanup_handler *cleanup_stack;