a4218e2144
1. Add internal scheduler functions should begin with nxsched_, not sched_ 2. Follow the consistent naming patter of https://cwiki.apache.org/confluence/display/NUTTX/Naming+of+OS+Internal+Functions
120 lines
3.6 KiB
C
Executable file
120 lines
3.6 KiB
C
Executable file
/****************************************************************************
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* arch/arm/src/armv8-m/arm_releasepending.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sched.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include "sched/sched.h"
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#include "arm_internal.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_release_pending
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*
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* Description:
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* Release and ready-to-run tasks that have
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* collected in the pending task list. This can call a
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* context switch if a new task is placed at the head of
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* the ready to run list.
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*
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****************************************************************************/
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void up_release_pending(void)
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{
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struct tcb_s *rtcb = this_task();
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sinfo("From TCB=%p\n", rtcb);
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/* Merge the g_pendingtasks list into the ready-to-run task list */
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#if 0
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sched_lock();
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#endif
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if (sched_mergepending())
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{
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/* The currently active task has changed! We will need to switch
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* contexts.
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*/
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/* Update scheduler parameters */
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nxsched_suspend_scheduler(rtcb);
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/* Are we operating in interrupt context? */
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if (CURRENT_REGS)
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{
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/* Yes, then we have to do things differently. Just copy the
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* CURRENT_REGS into the OLD rtcb.
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*/
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arm_savestate(rtcb->xcp.regs);
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/* Restore the exception context of the rtcb at the (new) head
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* of the ready-to-run task list.
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*/
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rtcb = this_task();
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/* Update scheduler parameters */
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nxsched_resume_scheduler(rtcb);
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/* Then switch contexts */
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arm_restorestate(rtcb->xcp.regs);
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}
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/* No, then we will need to perform the user context switch */
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else
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{
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struct tcb_s *nexttcb = this_task();
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/* Update scheduler parameters */
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nxsched_resume_scheduler(nexttcb);
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/* Switch context to the context of the task at the head of the
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* ready to run list.
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*/
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arm_switchcontext(rtcb->xcp.regs, nexttcb->xcp.regs);
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/* arm_switchcontext forces a context switch to the task at the
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* head of the ready-to-run list. It does not 'return' in the
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* normal sense. When it does return, it is because the blocked
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* task is again ready to run and has execution priority.
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*/
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}
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}
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}
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