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sample_task.c
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sample_task.c
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#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif /* __cpluscplus */
#endif /* __cpluscplus */
#include "stdio.h"
#include "los_task.h"
UINT32 g_taskHiId;
UINT32 g_taskLoId;
#define TSK_PRIOR_HI 4
#define TSK_PRIOR_LO 5
UINT32 Example_TaskHi(VOID)
{
UINT32 ret;
printf("Enter TaskHi Handler.\r\n");
/* 延时2个Tick，延时后该任务会挂起，执行剩余任务中最高优先级的任务(g_taskLoId任务) */
ret = LOS_TaskDelay(2);
if (ret != LOS_OK) {
printf("Delay Task Failed.\r\n");
return LOS_NOK;
}
/* 2个Tick时间到了后，该任务恢复，继续执行 */
printf("TaskHi LOS_TaskDelay Done.\r\n");
/* 挂起自身任务 */
ret = LOS_TaskSuspend(g_taskHiId);
if (ret != LOS_OK) {
printf("Suspend TaskHi Failed.\r\n");
return LOS_NOK;
}
printf("TaskHi LOS_TaskResume Success.\r\n");
return ret;
}
/* 低优先级任务入口函数 */
UINT32 Example_TaskLo(VOID)
{
UINT32 ret;
printf("Enter TaskLo Handler.\r\n");
/* 延时2个Tick，延时后该任务会挂起，执行剩余任务中最高优先级的任务(背景任务) */
ret = LOS_TaskDelay(2);
if (ret != LOS_OK) {
printf("Delay TaskLo Failed.\r\n");
return LOS_NOK;
}
printf("TaskHi LOS_TaskSuspend Success.\r\n");
/* 恢复被挂起的任务g_taskHiId */
ret = LOS_TaskResume(g_taskHiId);
if (ret != LOS_OK) {
printf("Resume TaskHi Failed.\r\n");
return LOS_NOK;
}
printf("TaskHi LOS_TaskDelete Success.\r\n");
return ret;
}
/* 任务测试入口函数，创建两个不同优先级的任务 */
UINT32 Example_TskCaseEntry(VOID)
{
UINT32 ret;
TSK_INIT_PARAM_S initParam;
/* 锁任务调度，防止新创建的任务比本任务高而发生调度 */
LOS_TaskLock();
printf("LOS_TaskLock() Success!\r\n");
initParam.pfnTaskEntry = (TSK_ENTRY_FUNC)Example_TaskHi;
initParam.usTaskPrio = TSK_PRIOR_HI;
initParam.pcName = "TaskHi";
initParam.uwStackSize = LOSCFG_TASK_MIN_STACK_SIZE;
initParam.uwResved = LOS_TASK_STATUS_DETACHED;
/* 创建高优先级任务，由于锁任务调度，任务创建成功后不会马上执行 */
ret = LOS_TaskCreate(&g_taskHiId, &initParam);
if (ret != LOS_OK) {
LOS_TaskUnlock();
printf("Example_TaskHi create Failed!\r\n");
return LOS_NOK;
}
printf("Example_TaskHi create Success!\r\n");
initParam.pfnTaskEntry = (TSK_ENTRY_FUNC)Example_TaskLo;
initParam.usTaskPrio = TSK_PRIOR_LO;
initParam.pcName = "TaskLo";
initParam.uwStackSize = LOSCFG_TASK_MIN_STACK_SIZE;
initParam.uwResved = LOS_TASK_STATUS_DETACHED;
/* 创建低优先级任务，由于锁任务调度，任务创建成功后不会马上执行 */
ret = LOS_TaskCreate(&g_taskLoId, &initParam);
if (ret != LOS_OK) {
LOS_TaskUnlock();
printf("Example_TaskLo create Failed!\r\n");
return LOS_NOK;
}
printf("Example_TaskLo create Success!\r\n");
/* 解锁任务调度，此时会发生任务调度，执行就绪队列中最高优先级任务 */
LOS_TaskUnlock();
return LOS_OK;
}
#ifdef __cplusplus
#if __cplusplus
}
#endif /* __cpluscplus */
#endif /* __cpluscplus */