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, 14 insertions, 0 deletions

diff --git a/cpukit/score/src/userextiterate.c b/cpukit/score/src/userextiterate.c
index c9125016de..beeee9570b 100644
--- a/cpukit/score/src/userextiterate.c
+++ b/cpukit/score/src/userextiterate.c
@@ -124,6 +124,20 @@ void _User_extensions_Fatal_visitor(
   }
 }
 
+void _User_extensions_Thread_terminate_visitor(
+  Thread_Control              *executing,
+  void                        *arg,
+  const User_extensions_Table *callouts
+)
+{
+  User_extensions_thread_terminate_extension callout =
+    callouts->thread_terminate;
+
+  if ( callout != NULL ) {
+    (*callout)( executing );
+  }
+}
+
 void _User_extensions_Iterate(
   void                    *arg,
   User_extensions_Visitor  visitor