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OS_ERR_NONE
If the count was changed or, not changed, because one or more tasks was waiting on the semaphore.
OS_ERR_OBJ_PTR_NULL
If OS_CFG_ARG_CHK_EN is set to 1 in DEF_ENABLED in os_cfg.h: if p_sem is a NULL pointer.
...
If OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in DEF_ENABLED in os_cfg.h: if p_sem is not pointing to a semaphore.
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If OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in DEF_ENABLED in os_cfg.h: if this function was called from an ISR.
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If tasks are waiting on the semaphore, the count is not changed.
Returned Value
None
Required Configuration
OS_CFG_SEM_EN and OS_CFG_SEM_SET_EN must be enabled in os_cfg.h. Refer to uCµC-OS-III Configuration Manual.
Callers
Application.
Notes/Warnings
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