score: Thread life cycle re-implementation

The thread deletion is now supported on SMP.

This change fixes the following PRs:

PR1814: SMP race condition between stack free and dispatch

PR2035: psxcancel reveals NULL pointer access in _Thread_queue_Extract()

The POSIX cleanup handler are now called in the right context (should be
called in the context of the terminating thread).

http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_09.html

Add a user extension the reflects a thread termination event.  This is
used to reclaim the Newlib reentrancy structure (may use file
operations), the POSIX cleanup handlers and the POSIX key destructors.

1 files changed, 16 insertions, 0 deletions

diff --git a/cpukit/score/include/rtems/score/userextimpl.h b/cpukit/score/include/rtems/score/userextimpl.h
index 25c6f00d0b..04808e1f17 100644
--- a/cpukit/score/include/rtems/score/userextimpl.h
+++ b/cpukit/score/include/rtems/score/userextimpl.h
@@ -142,6 +142,12 @@ void _User_extensions_Fatal_visitor(
   const User_extensions_Table *callouts
 );
 
+void _User_extensions_Thread_terminate_visitor(
+  Thread_Control              *executing,
+  void                        *arg,
+  const User_extensions_Table *callouts
+);
+
 /**
  * @brief Iterates through all user extensions and calls the visitor for each.
  *
@@ -239,6 +245,16 @@ static inline void _User_extensions_Fatal(
   _User_extensions_Iterate( &ctx, _User_extensions_Fatal_visitor );
 }
 
+static inline void _User_extensions_Thread_terminate(
+  Thread_Control *executing
+)
+{
+  _User_extensions_Iterate(
+    executing,
+    _User_extensions_Thread_terminate_visitor
+  );
+}
+
 /** @} */
 
 /** @} */