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-rw-r--r--cpukit/score/src/userextaddset.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/cpukit/score/src/userextaddset.c b/cpukit/score/src/userextaddset.c
index d24dc4a8e9..270d93cf5f 100644
--- a/cpukit/score/src/userextaddset.c
+++ b/cpukit/score/src/userextaddset.c
@@ -20,6 +20,7 @@
#endif
#include <rtems/score/userextimpl.h>
+#include <rtems/score/percpu.h>
void _User_extensions_Add_set(
User_extensions_Control *the_extension
@@ -32,11 +33,16 @@ void _User_extensions_Add_set(
*/
if ( the_extension->Callouts.thread_switch != NULL ) {
+ ISR_Level level;
+
the_extension->Switch.thread_switch =
the_extension->Callouts.thread_switch;
- _Chain_Append(
+
+ _Per_CPU_Acquire_all( level );
+ _Chain_Append_unprotected(
&_User_extensions_Switches_list,
&the_extension->Switch.Node
);
+ _Per_CPU_Release_all( level );
}
}