score: New timer server implementation

Use mostly the standard watchdog operations.  Use a system event for
synchronization.  This implementation is simpler and offers better SMP
performance.

Close #2131.

1 files changed, 23 insertions, 12 deletions

diff --git a/cpukit/score/src/watchdogadjust.c b/cpukit/score/src/watchdogadjust.c
index 04fc1a55a7..32b5f7990e 100644
--- a/cpukit/score/src/watchdogadjust.c
+++ b/cpukit/score/src/watchdogadjust.c
@@ -19,26 +19,18 @@
 #endif
 
 #include <rtems/score/watchdogimpl.h>
-#include <rtems/score/chainimpl.h>
-#include <rtems/score/isrlevel.h>
 
-void _Watchdog_Adjust_backward(
+void _Watchdog_Adjust_backward_locked(
   Watchdog_Header   *header,
   Watchdog_Interval  units
 )
 {
-  ISR_lock_Context lock_context;
-
-  _Watchdog_Acquire( header, &lock_context );
-
   if ( !_Watchdog_Is_empty( header ) ) {
      _Watchdog_First( header )->delta_interval += units;
   }
-
-  _Watchdog_Release( header, &lock_context );
 }
 
-void _Watchdog_Adjust_forward(
+void _Watchdog_Adjust_backward(
   Watchdog_Header   *header,
   Watchdog_Interval  units
 )
@@ -46,7 +38,16 @@ void _Watchdog_Adjust_forward(
   ISR_lock_Context lock_context;
 
   _Watchdog_Acquire( header, &lock_context );
+  _Watchdog_Adjust_backward_locked( header, units );
+  _Watchdog_Release( header, &lock_context );
+}
 
+void _Watchdog_Adjust_forward_locked(
+  Watchdog_Header   *header,
+  Watchdog_Interval  units,
+  ISR_lock_Context  *lock_context
+)
+{
   while ( !_Watchdog_Is_empty( header ) && units > 0 ) {
     Watchdog_Control *first = _Watchdog_First( header );
 
@@ -57,13 +58,23 @@ void _Watchdog_Adjust_forward(
       units -= first->delta_interval;
       first->delta_interval = 1;
 
-      _Watchdog_Release( header, &lock_context );
+      _Watchdog_Release( header, lock_context );
 
       _Watchdog_Tickle( header );
 
-      _Watchdog_Acquire( header, &lock_context );
+      _Watchdog_Acquire( header, lock_context );
     }
   }
+}
 
+void _Watchdog_Adjust_forward(
+  Watchdog_Header   *header,
+  Watchdog_Interval  units
+)
+{
+  ISR_lock_Context lock_context;
+
+  _Watchdog_Acquire( header, &lock_context );
+  _Watchdog_Adjust_forward_locked( header, units, &lock_context );
   _Watchdog_Release( header, &lock_context );
 }