--- a/hotspot/src/os/bsd/vm/os_bsd.cpp	Tue Aug 20 13:47:40 2013 -0700
+++ b/hotspot/src/os/bsd/vm/os_bsd.cpp	Wed Aug 21 13:18:52 2013 +0200
@@ -642,13 +642,14 @@
 #endif
 
 #ifdef __APPLE__
-static uint64_t locate_unique_thread_id() {
+static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
   // Additional thread_id used to correlate threads in SA
   thread_identifier_info_data_t     m_ident_info;
   mach_msg_type_number_t            count = THREAD_IDENTIFIER_INFO_COUNT;
 
-  thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO,
+  thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
               (thread_info_t) &m_ident_info, &count);
+
   return m_ident_info.thread_id;
 }
 #endif
@@ -679,9 +680,14 @@
   }
 
 #ifdef __APPLE__
-  // thread_id is mach thread on macos
-  osthread->set_thread_id(::mach_thread_self());
-  osthread->set_unique_thread_id(locate_unique_thread_id());
+  // thread_id is mach thread on macos, which pthreads graciously caches and provides for us
+  mach_port_t thread_id = ::pthread_mach_thread_np(::pthread_self());
+  guarantee(thread_id != 0, "thread id missing from pthreads");
+  osthread->set_thread_id(thread_id);
+
+  uint64_t unique_thread_id = locate_unique_thread_id(thread_id);
+  guarantee(unique_thread_id != 0, "unique thread id was not found");
+  osthread->set_unique_thread_id(unique_thread_id);
 #else
   // thread_id is pthread_id on BSD
   osthread->set_thread_id(::pthread_self());
@@ -843,8 +849,14 @@
 
   // Store pthread info into the OSThread
 #ifdef __APPLE__
-  osthread->set_thread_id(::mach_thread_self());
-  osthread->set_unique_thread_id(locate_unique_thread_id());
+  // thread_id is mach thread on macos, which pthreads graciously caches and provides for us
+  mach_port_t thread_id = ::pthread_mach_thread_np(::pthread_self());
+  guarantee(thread_id != 0, "just checking");
+  osthread->set_thread_id(thread_id);
+
+  uint64_t unique_thread_id = locate_unique_thread_id(thread_id);
+  guarantee(unique_thread_id != 0, "just checking");
+  osthread->set_unique_thread_id(unique_thread_id);
 #else
   osthread->set_thread_id(::pthread_self());
 #endif
@@ -1115,7 +1127,7 @@
 
 intx os::current_thread_id() {
 #ifdef __APPLE__
-  return (intx)::mach_thread_self();
+  return (intx)::pthread_mach_thread_np(::pthread_self());
 #else
   return (intx)::pthread_self();
 #endif