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If no tasks were waiting on the queue. In this case, the return value is also 0.
OS_ERR_INT_Q_FULL
If OS_CFG_ISR_POST_DEFERRED_EN is to DEF_ENABLED in os_cfg.h: If the deferred interrupt post queue is full.
OS_ERR_MSG_POOL_EMPTY
If there are no more OS_MSG structures to use to store the message.
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