ST20C2 datasheet(186/212 Pages) STMICROELECTRONICS

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taltwt

186/212

taltwt

timer alt wait

Code: 25 FI

Description: Wait until one of the enabled guards of a timer alternative is ready and

initialize pw.Temp for use during the disabling sequence. If the alternative has no

ready guard but may become ready due to a timer, place the process onto the timer

list.

Definition:

if (word[Wptr @ pw.State]

= Ready.p)

word

′[Wptr @ pw.Time]

← ClockReg[Priority]

else if (word[Wptr @ pw.Tlink]

= TimeNotSet.p)

{

word

′[Wptr @ pw.State]

← Waiting.p

deschedule process and wait for one of the guards to become ready

}

else if (word[Wptr @ pw.Tlink]

= TimeSet.p)

{

if (ClockReg[Priority] after word[Wptr @ pw.Time]

{

word

′[Wptr @ pw.State]

← Ready.p

word

′[Wptr @ pw.Time]

← ClockReg[Priority]

}

else

{

word

′[Wptr @ pw.Time]

← (word[Wptr @ pw.Time] + 1)

insert this process into timer list with alarm time (word[Wptr @ pw.Time]

+ 1)

if (

no guards ready)

{

word

′[Wptr @ pw.State] ← Waiting.p

deschedule process and wait for one of the guards to become ready

}

else

Undefined effect

word

′[Wptr @ pw.Temp]

← NoneSelected.o

Areg

′← undefined

Breg

′← undefined

Creg

′← undefined

Error signals: none

ST20C2 Fiches technique(PDF) 186 Page - STMicroelectronics

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