score: Modify _Per_CPU_Perform_jobs()

Process only the jobs initially registered on the processing list.  This
makes it possible to add jobs for the current processor in a job
handler.  These jobs are processed with the next
SMP_MESSAGE_PERFORM_JOBS message.  The lock is only acquired and
released once.

1 files changed, 7 insertions, 5 deletions

diff --git a/cpukit/score/src/smpmulticastaction.c b/cpukit/score/src/smpmulticastaction.c
index 1207000e6a..b5d21a4b56 100644
--- a/cpukit/score/src/smpmulticastaction.c
+++ b/cpukit/score/src/smpmulticastaction.c
@@ -44,18 +44,20 @@ void _Per_CPU_Perform_jobs( Per_CPU_Control *cpu )
   Per_CPU_Job      *job;
 
   _Per_CPU_Jobs_ISR_disable_and_acquire( cpu, &lock_context );
+  job = cpu->Jobs.head;
+  cpu->Jobs.head = NULL;
+  _Per_CPU_Jobs_release_and_ISR_enable( cpu, &lock_context );
 
-  while ( ( job = cpu->Jobs.head ) != NULL ) {
+  while ( job != NULL ) {
     const Per_CPU_Job_context *context;
-
-    cpu->Jobs.head = job->next;
-    _Per_CPU_Jobs_release_and_ISR_enable( cpu, &lock_context );
+    Per_CPU_Job               *next;
 
     context = job->context;
+    next = job->next;
     ( *context->handler )( context->arg );
     _Atomic_Store_ulong( &job->done, PER_CPU_JOB_DONE, ATOMIC_ORDER_RELEASE );
 
-    _Per_CPU_Jobs_ISR_disable_and_acquire( cpu, &lock_context );
+    job = next;
   }
 }