The following shows the service calls provided by the RI78V4 as the synchronization and communication functions (data queues).

Table 12-12 Synchronization and Communication Functions (Data Queues)

Service Call	Function	Origin of Service Call
snd_dtq	Send to data queue (waiting forever)	Task
psnd_dtq	Send to data queue (polling)	Task, Non-task, Initialization routine
ipsnd_dtq	Send to data queue (polling)	Task, Non-task, Initialization routine
tsnd_dtq	Send to data queue (with timeout)	Task
fsnd_dtq	Forced send to data queue	Task, Non-task, Initialization routine
ifsnd_dtq	Forced send to data queue	Task, Non-task, Initialization routine
rcv_dtq	Receive from data queue (waiting forever)	Task
prcv_dtq	Receive from data queue (polling)	Task, Non-task, Initialization routine
prcv_dtq	Receive from data queue (polling)	Task, Non-task, Initialization routine
trcv_dtq	Receive from data queue (with timeout)	Task
ref_dtq	Reference data queue state	Task, Non-task, Initialization routine