tsnd_dtq
ER tsnd_dtq (ID dtqid, VP_INT data, TMO tmout);
This service call writes data specified by parameter data to the data queue area of the data queue specified by parameter dtqid.
If there is no available space for writing data in the data queue area of the target data queue when this service call is issued, the service call does not write data but queues the invoking task to the transmission wait queue of the target data queue and moves it from the RUNNING state to the WAITING state with time (data transmission wait state).
The sending WAITING state for a data queue is cancelled in the following cases, and then moved to the READY state.
An available space was secured in the data queue area of the target data queue as a result of issuing rcv_dtq.
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An available space was secured in the data queue area of the target data queue as a result of issuing prcv_dtq.
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An available space was secured in the data queue area of the target data queue as a result of issuing iprcv_dtq.
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An available space was secured in the data queue area of the target data queue as a result of issuing trcv_dtq.
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If a task has been queued to the reception wait queue of the target data queue when this service call is issued, this service call does not write data but transfers the data to the task. As a result, the task is unlinked from the reception wait queue and moves from the WAITING state (data reception wait state) to the READY state, or from the WAITING-SUSPENDED state to the SUSPENDED state.
Note 1 Data is written to the data queue area of the target data queue in the order of the data transmission request.
Note 2 Invoking tasks are queued to the transmission wait queue of the target data queue in the order defined during configuration (FIFO order or priority order).
Note 3 TMO_FEVR is specified for wait time tmout, processing equivalent to snd_dtq will be executed. When TMO_POL is specified, processing equivalent to psnd_dtq /ipsnd_dtq will be executed.