From 088acbb01fc5060f687e4776f8fc6862060d3aa8 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Tue, 7 Mar 2017 13:07:02 +0100 Subject: score: Fix scheduler yield in SMP configurations Check that no ask help request is registered during unblock and yield scheduler operations. There is no need to ask for help if a scheduled thread yields, since this is already covered by the pre-emption detection. Update #2556. --- cpukit/score/src/schedulersmp.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 cpukit/score/src/schedulersmp.c (limited to 'cpukit/score/src') diff --git a/cpukit/score/src/schedulersmp.c b/cpukit/score/src/schedulersmp.c new file mode 100644 index 0000000000..d68ac4fc8b --- /dev/null +++ b/cpukit/score/src/schedulersmp.c @@ -0,0 +1,38 @@ +/* + * Copyright (c) 2014, 2017 embedded brains GmbH. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include + +void _Scheduler_Request_ask_for_help( Thread_Control *the_thread ) +{ + ISR_lock_Context lock_context; + + _Thread_Scheduler_acquire_critical( the_thread, &lock_context ); + + if ( _Chain_Is_node_off_chain( &the_thread->Scheduler.Help_node ) ) { + Per_CPU_Control *cpu; + + cpu = _Thread_Get_CPU( the_thread ); + _Per_CPU_Acquire( cpu ); + + _Chain_Append_unprotected( + &cpu->Threads_in_need_for_help, + &the_thread->Scheduler.Help_node + ); + + _Per_CPU_Release( cpu ); + + _Thread_Dispatch_request( _Per_CPU_Get(), cpu ); + } + + _Thread_Scheduler_release_critical( the_thread, &lock_context ); +} -- cgit v1.2.3