The following lists the service calls provided by the RI78V4 as the synchronization and communication functions (semaphores).

Table 12-10 Synchronization and Communication Functions (Semaphores)

Service Call	Function	Origin of Service Call
sig_sem	Release semaphore resource.	Task, Non-task
isig_sem	Release semaphore resource.	Task, Non-task
wai_sem	Acquire semaphore resource (waiting forever).	Task
pol_sem	Acquire semaphore resource (polling).	Task, Non-task
twai_sem	Acquire semaphore resource (with timeout).	Task
ref_sem	Reference semaphore state.	Task, Non-task