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The following shows the service calls provided by the RI600V4 as the synchronization and communication functions (semaphores).

Table 18-5 Synchronization and Communication Functions (Semaphores)


Service Call	Function	Useful Range
wai_sem	Acquire semaphore resource (waiting forever)	Task
pol_sem	Acquire semaphore resource (polling)	Task
ipol_sem	Acquire semaphore resource (polling)	Non-task
twai_sem	Acquire semaphore resource (with time-out)	Task
sig_sem	Release semaphore resource	Task
isig_sem	Release semaphore resource	Non-task
ref_sem	Reference semaphore state	Task
iref_sem	Reference semaphore state	Non-task