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is a pointer to a variable that will contain an error code returned by this function.
OS_ERR_NONE
if If the call was successful, and the function set the value of the desired task register.
OS_ERR_REG_ID_INVALID
if If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if a valid task register identifier is not specified.
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