source: rtems/cpukit/score/src/schedulersmpstartidle.c @ 99fc1d1d

5
Last change on this file since 99fc1d1d was d37adfe5, checked in by Sebastian Huber <sebastian.huber@…>, on 03/03/16 at 06:02:03

score: Fix CPU time used by executing threads

The CPU time used of a thread was previously maintained per-processor
mostly during _Thread_Dispatch(). However, on SMP configurations the
actual processor of a thread is difficult to figure out since thread
dispatching is a highly asynchronous process (e.g. via inter-processor
interrupts). Only the intended processor of a thread is known to the
scheduler easily. Do the CPU usage accounting during thread heir
updates in the context of the scheduler operations. Provide the
function _Thread_Get_CPU_time_used() to get the CPU usage of a thread
using proper locks to get a consistent value.

Close #2627.
  • Property mode set to 100644
File size: 934 bytes
Line 
1/*
2 * Copyright (c) 2013-2014 embedded brains GmbH
3 *
4 * The license and distribution terms for this file may be
5 * found in the file LICENSE in this distribution or at
6 * http://www.rtems.org/license/LICENSE.
7 */
8
9#if HAVE_CONFIG_H
10  #include "config.h"
11#endif
12
13#include <rtems/score/schedulersmpimpl.h>
14
15void _Scheduler_SMP_Start_idle(
16  const Scheduler_Control *scheduler,
17  Thread_Control *thread,
18  Per_CPU_Control *cpu
19)
20{
21  Scheduler_Context *context = _Scheduler_Get_context( scheduler );
22  Scheduler_SMP_Context *self = _Scheduler_SMP_Get_self( context );
23  Scheduler_SMP_Node *node = _Scheduler_SMP_Thread_get_node( thread );
24
25  _Scheduler_Thread_change_state( thread, THREAD_SCHEDULER_SCHEDULED );
26  node->state = SCHEDULER_SMP_NODE_SCHEDULED;
27
28  _Thread_Set_CPU( thread, cpu );
29  _Chain_Append_unprotected( &self->Scheduled, &node->Base.Node );
30  _Chain_Prepend_unprotected( &self->Idle_threads, &thread->Object.Node );
31}
Note: See TracBrowser for help on using the repository browser.