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151 lines
5.0 KiB
151 lines
5.0 KiB
/* ----------------------------------------------------------------------------
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* Copyright (c) Huawei Technologies Co., Ltd. 2018-2019. All rights reserved.
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* Description: Scheduler Private HeadFile
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* Author: Huawei LiteOS Team
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* Create: 2018-09-10
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --------------------------------------------------------------------------- */
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#ifndef _LOS_SCHED_PRI_H
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#define _LOS_SCHED_PRI_H
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#include "los_percpu_pri.h"
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#include "los_hwi.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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extern UINT32 g_taskScheduled;
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/*
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* Schedule flag, one bit represents one core.
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* This flag is used to prevent kernel scheduling before OSStartToRun.
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*/
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#define OS_SCHEDULER_SET(cpuid) do { \
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g_taskScheduled |= (1U << (cpuid)); \
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} while (0);
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#define OS_SCHEDULER_CLR(cpuid) do { \
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g_taskScheduled &= ~(1U << (cpuid)); \
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} while (0);
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#define OS_SCHEDULER_ACTIVE (g_taskScheduled & (1U << ArchCurrCpuid()))
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typedef enum {
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INT_NO_RESCH = 0, /* no needs to schedule */
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INT_PEND_RESCH, /* pending schedule flag */
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} SchedFlag;
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/* Check if preemptable with counter flag */
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STATIC INLINE BOOL OsPreemptable(VOID)
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{
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/*
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* Unlike OsPreemptableInSched, the int may be not disabled when OsPreemptable
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* is called, needs manually disable interrupt, to prevent current task from
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* being migrated to another core, and get the wrong preemptable status.
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*/
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UINT32 intSave = LOS_IntLock();
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BOOL preemptable = (OsPercpuGet()->taskLockCnt == 0);
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if (!preemptable) {
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/* Set schedule flag if preemption is disabled */
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OsPercpuGet()->schedFlag = INT_PEND_RESCH;
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}
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LOS_IntRestore(intSave);
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return preemptable;
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}
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STATIC INLINE BOOL OsPreemptableInSched(VOID)
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{
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BOOL preemptable = FALSE;
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#ifdef LOSCFG_KERNEL_SMP
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/*
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* For smp systems, schedule must hold the task spinlock, and this counter
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* will increase by 1 in that case.
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*/
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preemptable = (OsPercpuGet()->taskLockCnt == 1);
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#else
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preemptable = (OsPercpuGet()->taskLockCnt == 0);
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#endif
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if (!preemptable) {
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/* Set schedule flag if preemption is disabled */
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OsPercpuGet()->schedFlag = INT_PEND_RESCH;
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}
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return preemptable;
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}
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/*
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* This function simply picks the next task and switches to it.
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* Current task needs to already be in the right state or the right
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* queues it needs to be in.
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*/
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extern VOID OsSchedResched(VOID);
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/*
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* This function put the current task back to the ready queue and
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* try to do the schedule. However, the schedule won't be definitely
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* taken place while there're no other higher priority tasks or locked.
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*/
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extern VOID OsSchedPreempt(VOID);
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/*
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* Just like OsSchedPreempt, except this function will do the OS_INT_ACTIVE
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* check, in case the schedule taken place in the middle of an interrupt.
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*/
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STATIC INLINE VOID LOS_Schedule(VOID)
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{
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if (OS_INT_ACTIVE) {
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OsPercpuGet()->schedFlag = INT_PEND_RESCH;
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return;
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}
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/*
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* trigger schedule in task will also do the slice check
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* if necessary, it will give up the timeslice more in time.
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* otherwise, there's no other side effects.
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*/
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OsSchedPreempt();
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}
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#ifdef LOSCFG_BASE_CORE_TIMESLICE
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/**
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* @ingroup los_sched
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* This API is used to check time slices. If the number of Ticks equals to the time for task switch,
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* tasks are switched. Otherwise, the Tick counting continues.
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*/
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extern VOID OsTimesliceCheck(VOID);
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#endif
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif /* _LOS_SCHED_PRI_H */
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