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the call is successful and the scheduler is no longer locked.
OS_ERR_OS_NOT_RUNNING
if If calling this function before calling OSStart().
OS_ERR_SCHED_LOCKED
if If the scheduler is still locked. This would indicate that scheduler lock has not fully unnested
OS_ERR_SCHED_NOT_LOCKED
if If the user did not call OSSchedLock().
OS_ERR_SCHED_UNLOCK_ISR
if If OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in os_cfg.h: if you attempted to unlock scheduler from an ISR.
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