diff options
Diffstat (limited to 'cpukit/score/src/schedulercbs.c')
-rw-r--r-- | cpukit/score/src/schedulercbs.c | 66 |
1 files changed, 60 insertions, 6 deletions
diff --git a/cpukit/score/src/schedulercbs.c b/cpukit/score/src/schedulercbs.c index 8e5bf86f27..7aa79f2157 100644 --- a/cpukit/score/src/schedulercbs.c +++ b/cpukit/score/src/schedulercbs.c @@ -1,3 +1,5 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + /** * @file * @@ -11,9 +13,26 @@ * Copyright (C) 2011 Petr Benes. * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). * - * 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. + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H @@ -21,10 +40,17 @@ #endif #include <rtems/score/schedulercbsimpl.h> +#include <rtems/score/statesimpl.h> +#include <rtems/score/threadcpubudget.h> -void _Scheduler_CBS_Budget_callout( - Thread_Control *the_thread -) +/** + * @brief Invoked when a limited time quantum is exceeded. + * + * This routine is invoked when a limited time quantum is exceeded. + * + * @param the_thread The thread that exceeded a limited time quantum. + */ +static void _Scheduler_CBS_Budget_callout( Thread_Control *the_thread ) { Scheduler_CBS_Node *node; Scheduler_CBS_Server_id server_id; @@ -52,6 +78,34 @@ void _Scheduler_CBS_Budget_callout( } } +static void _Scheduler_CBS_Budget_at_tick( Thread_Control *the_thread ) +{ + uint32_t budget_available; + + if ( !the_thread->is_preemptible ) { + return; + } + + if ( !_States_Is_ready( the_thread->current_state ) ) { + return; + } + + budget_available = the_thread->CPU_budget.available; + + if ( budget_available == 1 ) { + the_thread->CPU_budget.available = 0; + _Scheduler_CBS_Budget_callout ( the_thread ); + } else { + the_thread->CPU_budget.available = budget_available - 1; + } +} + +const Thread_CPU_budget_operations _Scheduler_CBS_Budget = { + .at_tick = _Scheduler_CBS_Budget_at_tick, + .at_context_switch = _Thread_CPU_budget_do_nothing, + .initialize = _Thread_CPU_budget_do_nothing +}; + int _Scheduler_CBS_Initialize(void) { return SCHEDULER_CBS_OK; |