ST20C2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20C2

Instruction Set Reference Manual

STMicroelectronics 

wait

wait

wait

Code: 60 F5

Description: Wait (or P) on the semaphore pointed to by Areg. If the semaphore

count is greater than zero then the count is decremented and the process continues;

otherwise the current process is descheduled and added to the back of the

semaphore list.

Definition:

if (word[Areg @ s.Count] = 0)

{

Put process on back of semaphore list

Start next process

}

else

word′[Areg @ s.Count] ← word[Areg @ s.Count] − 1

Areg′

Breg′

Creg′

← undefined

← undefined

← undefined

Error signals: none

Comments:

Secondary instruction.

Instruction is a descheduling point.

See also: signal

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