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with RI78V4
Coding
SERVICE CALLS
Synchronization and Communication Functions (Semaphores)
pol_sem

pol_sem

Outline

Acquire semaphore resource (polling).

C format


ER pol_sem ( ID semid );

Assembly format


MOV A, #semid CALL !!_pol_sem

Parameter(s)


I/O	Parameter	Description
I	ID semid;	ID number of the semaphore from which resource is acquired.

Explanation

This service call acquires a resource from the semaphore specified by parameter semid (subtracts 0x1 from the semaphore counter).

If a resource could not be acquired from the target semaphore (semaphore counter is set to 0x0) when this service call is issued, the counter manipulation processing is not performed but "E_TMOUT" is returned.

Return value


Macro	Value	Description
E_OK	0	Normal completion.
E_TMOUT	-50	Polling failure.