Page Comparison

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the call is successful.

OS_ERR_FLAGINT_INVALIDQ_OPTFULL

If If OS_CFG_ISR_ARGPOST_CHKDEFERRED_EN is set to 1 in  is to DEF_ENABLED in os_cfg.h: if you specified an invalid option If the deferred interrupt post queue is full.

OS_ERR_OBJ_PTR_NULL

If OS_CFG_ARG_CHK_EN is set to 1 in DEF_ENABLED in os_cfg.h: if the caller passed a NULL pointer.

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If OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in DEF_ENABLED in os_cfg.h: p_grp is not pointing to an event flag group.

OS_ERR_OPT_INVALID

If OS_CFG_ARG_CHK_EN is set to DEF_ENABLED in os_cfg.h: if you specified an invalid option.

OS_ERR_OS_NOT_RUNNING

If OS_CFG_INVALID_OS_CALLS_CHK_EN is set to DEF_ENABLED in os_cfg.h: if µC/OS-III is not running yet.

Returned Value

The new value of the event flags.

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OS_CFG_FLAG_EN must be enabled in os_cfg.h. Refer to uCµC-OS-III Configuration Manual.

Callers

Application and ISRs.

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1. Event flag groups must be created before they are used.
2. The execution time of this function depends on the number of tasks waiting on the event flag group. However, the execution time is still deterministic.
3. Although the example below shows that we are posting from a task, OSFlagPost() can also be called from an ISR.

Example Usage