2010-06-28 Joel Sherrill <joel.sherrill@oarcorp.com>

	PR 1573/cpukit
	* configure.ac, posix/src/killinfo.c,
	posix/src/psignalclearprocesssignals.c,
	posix/src/psignalsetprocesssignals.c,
	posix/src/psignalunblockthread.c, posix/src/pthreadcreate.c,
	posix/src/pthreadkill.c, posix/src/pthreadsigmask.c,
	rtems/src/signalsend.c, rtems/src/taskmode.c, score/Makefile.am,
	score/preinstall.am, score/include/rtems/system.h,
	score/include/rtems/score/context.h, score/include/rtems/score/isr.h,
	score/include/rtems/score/thread.h, score/src/isr.c,
	score/src/isrthreaddispatch.c, score/src/thread.c,
	score/src/threaddispatch.c, score/src/threadloadenv.c: Add a per cpu
	data structure which contains the information required by RTEMS for
	each CPU core. This encapsulates information such as thread
	executing, heir, idle and dispatch needed.
	* score/include/rtems/score/percpu.h, score/src/percpu.c: New files.

1 files changed, 16 insertions, 6 deletions

diff --git a/cpukit/score/src/threaddispatch.c b/cpukit/score/src/threaddispatch.c
index e0d0f5cdf7..3d7fe24947 100644
--- a/cpukit/score/src/threaddispatch.c
+++ b/cpukit/score/src/threaddispatch.c
@@ -94,12 +94,26 @@ void _Thread_Dispatch( void )
     _Thread_Dispatch_disable_level = 1;
     _Context_Switch_necessary = false;
     _Thread_Executing = heir;
+
+    /*
+     *  When the heir and executing are the same, then we are being
+     *  requested to do the post switch dispatching.  This is normally
+     *  done to dispatch signals.
+     */
+    if ( heir == executing )
+      goto post_switch;
+
+    /*
+     *  Since heir and executing are not the same, we need to do a real
+     *  context switch.
+     */
 #if __RTEMS_ADA__
     executing->rtems_ada_self = rtems_ada_self;
     rtems_ada_self = heir->rtems_ada_self;
 #endif
     if ( heir->budget_algorithm == THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE )
       heir->cpu_time_budget = _Thread_Ticks_per_timeslice;
+
     _ISR_Enable( level );
 
     #ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__
@@ -170,14 +184,10 @@ void _Thread_Dispatch( void )
     _ISR_Disable( level );
   }
 
+post_switch:
   _Thread_Dispatch_disable_level = 0;
 
   _ISR_Enable( level );
 
-  if ( _Thread_Do_post_task_switch_extension ||
-       executing->do_post_task_switch_extension ) {
-    executing->do_post_task_switch_extension = false;
-    _API_extensions_Run_postswitch();
-  }
-
+  _API_extensions_Run_postswitch();
 }