Specifications

Operating System Routines

IOC$WFIKPCH, IOC$WFIRLCH

Suspend a driver fork thread and fold its context into a fork block in anticipation

of a device interrupt or timeout.

Module

IOSUBNPAG

Macro

WFIKPCH, WFIRLCH

Input

Location Contents

R3, R4 (Preserved)

R5 Address of UCB

00(SP) Address following the JSB to IOC$WFIKPCH or

IOC$WFIRLCH

04(SP) Timeout value in seconds

08(SP) IPL to which to lower before returning to the caller’s

caller

12(SP) Return PC of caller’s caller

EXE$GL_ABSTIM Absolute time

Output

Location Contents

UCB$L_DUETIM Sum of timeout value and EXE$GL_ABSTIM

UCB$V_INT Set to indicate that interrupts are expected on the

device

UCB$V_TIM Set to indicate device I/O is being timed

UCB$V_TIMOUT Cleared to indicate that unit is not timed out

UCB$L_FR3 R3

UCB$L_FR4 R4

UCB$L_FPC 00(SP)+2

3–143