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Thread.h
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2006-04-17
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header Thread
uses System, List
const
SYSTEM_STACK_SIZE = 1000 -- in words
STACK_SENTINEL = 0x24242424 -- in ASCII, this is "$$$$"
functions
InitializeScheduler ()
Run (nextThread: ptr to Thread)
PrintReadyList ()
ThreadStart ()
ThreadFinish ()
FatalError (errorMessage: ptr to array of char)
SetInterruptsTo (newStatus: int) returns int
TimerInterruptHandler ()
external Switch (prevThread, nextThread: ptr to Thread)
external ThreadStartUp ()
var
readyList: List [Thread]
currentThread: ptr to Thread
mainThread: Thread = new Thread
idleThread: Thread = new Thread
threadsToBeDestroyed: List [Thread]
currentInterruptStatus: int
enum JUST_CREATED, READY, RUNNING, BLOCKED, UNUSED -- Thread status
enum ENABLED, DISABLED -- Interrupt status
class Thread
superclass Listable
fields
-- The first two fields are at fixed offsets, hardwired into Switch!
regs: array [13] of int -- Space for r2..r14
stackTop: ptr to void -- Space for r15 (system stack top ptr)
name: ptr to array of char
status: int -- JUST_CREATED, READY, RUNNING, BLOCKED, UNUSED
systemStack: array [SYSTEM_STACK_SIZE] of int
methods
Init (n: ptr to array of char)
Fork (fun: ptr to function (int), arg: int)
Yield ()
Sleep ()
CheckOverflow ()
Print ()
endClass
endHeader