pthread_equal to compare thread ids

I am trying to port ZeroMQ to z/OS USS and I faced several problems. One of them is this function "is_current_thread" trying to compare two thread ids with operator "==". I've changed the code to use the official function "pthread_equal" to compare thread ids and now it's working fine.

src/thread.cpp

@@ -248,7 +248,7 @@ void zmq::thread_t::stop ()
 
 bool zmq::thread_t::is_current_thread () const
 {
-    return pthread_self () == _descriptor;
+    return bool( pthread_equal(pthread_self (), _descriptor) );
 }
 
 void zmq::thread_t::setSchedulingParameters (