From 8d5b03802e99e581c360e9a2cf67856596ec824c Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Fri, 1 Jul 2016 09:44:48 +0200 Subject: score: Workaround for #2751 The ARM and PowerPC interrupt epilogues call _Thread_Dispatch() with interrupts disabled (counter example: SPARC). On SMP configurations, since inter-processor interrupts set the thread dispatch necessary indicator this prevents a thread dispatch notification in post-switch handlers (which all run with interrupts disabled). On all configurations, this is a serious issue for the interrupt latency. Update #2751 --- cpukit/score/src/threadrestart.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/cpukit/score/src/threadrestart.c b/cpukit/score/src/threadrestart.c index 21e260b10b..32ecfba65d 100644 --- a/cpukit/score/src/threadrestart.c +++ b/cpukit/score/src/threadrestart.c @@ -357,6 +357,10 @@ void _Thread_Life_action_handler( _Thread_Make_zombie( executing ); + /* FIXME: Workaround for https://devel.rtems.org/ticket/2751 */ + cpu_self->dispatch_necessary = true; + + _Assert( cpu_self->heir != executing ); _Thread_Dispatch_enable( cpu_self ); RTEMS_UNREACHABLE(); } -- cgit v1.2.3