During initialization, µC/OS-III creates a minimum of two (2) internal tasks (OS_IdleTask() and OS_TickTask()) and, three (3) optional tasks (OS_StatTask(), OS_TmrTask() and OS_IntQTask()). The optional tasks are created based on the value of compile-time #defines found in os_cfg.h.:
OS_CFG_STAT_TASK_EN
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enables OS_StatTask()OS_CFG_TMR_EN
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enables OS_TmrTask()OS_CFG_ISR_POST_DEFERRED_EN
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enables OS_IntQTask()
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Advanced applications may not require the Tick task or the Idle task. To disable a task, set its configuration option to DEF_DISABLED in os_cfg.h. The following configuration parameters affect the Tick and Idle tasks, respectively:
OS_CFG_TASK_TICK_ENOS_CFG_TASK_IDLE_EN