joeq.Scheduler
Class jq_NativeThread

java.lang.Object
  joeq.Scheduler.jq_NativeThread

All Implemented Interfaces:

jq_DontAlign

public class jq_NativeThread
extends Object
implements jq_DontAlign

A jq_NativeThread corresponds to a virtual CPU in the scheduler. There is one jq_NativeThread object for each underlying (heavyweight) kernel thread. The Java (lightweight) threads are multiplexed across the jq_NativeThreads.

Version:

$Id: jq_NativeThread.java,v 1.61 2004/09/30 03:35:30 joewhaley Exp $

Author:

John Whaley , Miho Kurano

Field Summary

static jq_Class	_class
static jq_StaticMethod	_ctrl_break_handler
static jq_InstanceMethod	_nativeThreadEntry
static jq_StaticField	_num_of_daemon_threads
static jq_StaticField	_num_of_java_threads
static jq_InstanceMethod	_schedulerLoop
static jq_InstanceMethod	_threadSwitch
static boolean	CHECK
boolean	DETERMINISTIC
static int[]	DISTRIBUTION
static jq_NativeThread	initial_native_thread Data structure to represent the native thread that exists at virtual machine startup.
jq_InterrupterThread	it
static int	MAX_NATIVE_THREADS
static jq_NativeThread[]	native_threads An array of all native threads.
static int	NUM_OF_QUEUES
static int	relatively_prime_value GCD of relatively_prime_value and the maximum value in DISTRIBUTION should be 1.
static boolean	STATISTICS
static boolean	TRACE Trace flag.
static float	TRANSFER_THRESHOLD
static boolean	USE_INTERRUPTER_THREAD

Method Summary

static boolean	allNativeThreadsInitialized() Returns true iff all native threads are initialized.
static void	ctrl_break_handler()
void	dump(jq_RegisterState regs)
static void	dumpAllThreads()
static void	dumpStatistics()
void	dumpStats()
static void	endCurrentJavaThread() End the currently-executing Java thread and go back to the scheduler loop to pick up another thread.
CodeAllocator	getCodeAllocator() Get the native thread-local code allocator.
boolean	getContext(jq_RegisterState r) Gets context of this native thread and puts it in r.
jq_Thread	getCurrentJavaThread() Get the currently-executing Java thread.
jq_Thread	getCurrentThread() Returns the jq_Thread that is currently running on this native thread.
HeapAllocator	getHeapAllocator() Get the native thread-local heap allocator.
jq_ThreadQueue	getIdleQueue()
int	getIndex()
jq_ThreadQueue	getReadyQueue(int i)
jq_ThreadQueue	getTransferQueue()
static void	initBreakThread()
static void	initInitialNativeThread() Initialize the initial native thread.
static void	initNativeThreads(jq_NativeThread nt, int num) Initialize the extra native threads.
void	nativeThreadEntry() The entry point for new native threads.
void	resume() Starts up/resumes this native thread.
static void	resumeAllThreads()
void	schedulerLoop()
boolean	setContext(jq_RegisterState r) Sets context of this native thread to r.
static void	startJavaThread(jq_Thread t) Put the given Java thread on the queue of the least-busy native thread.
static void	startNativeThreads() Start up the extra native threads.
void	suspend() Suspends this native thread.
static void	suspendAllThreads()
void	threadSwitch() Thread switch based on a timer or poker interrupt.
String	toString()
void	yieldCurrentThread() Thread switch based on explicit yield.
void	yieldCurrentThreadTo(jq_Thread t)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TRACE

public static boolean TRACE

Trace flag. When this is true, prints out debugging information about what is going on in the scheduler.

CHECK

public static boolean CHECK

STATISTICS

public static final boolean STATISTICS

See Also:

Constant Field Values

initial_native_thread

public static final jq_NativeThread initial_native_thread

Data structure to represent the native thread that exists at virtual machine startup.

native_threads

public static jq_NativeThread[] native_threads

An array of all native threads.

MAX_NATIVE_THREADS

public static final int MAX_NATIVE_THREADS

See Also:

Constant Field Values

NUM_OF_QUEUES

public static final int NUM_OF_QUEUES

See Also:

Constant Field Values

USE_INTERRUPTER_THREAD

public static boolean USE_INTERRUPTER_THREAD

it

public jq_InterrupterThread it

TRANSFER_THRESHOLD

public static float TRANSFER_THRESHOLD

DETERMINISTIC

public boolean DETERMINISTIC

relatively_prime_value

public static final int relatively_prime_value

GCD of relatively_prime_value and the maximum value in DISTRIBUTION should be 1.

See Also:

Constant Field Values

DISTRIBUTION

public static final int[] DISTRIBUTION

_class

public static final jq_Class _class

_nativeThreadEntry

public static final jq_InstanceMethod _nativeThreadEntry

_schedulerLoop

public static final jq_InstanceMethod _schedulerLoop

_threadSwitch

public static final jq_InstanceMethod _threadSwitch

_ctrl_break_handler

public static final jq_StaticMethod _ctrl_break_handler

_num_of_java_threads

public static final jq_StaticField _num_of_java_threads

_num_of_daemon_threads

public static final jq_StaticField _num_of_daemon_threads

Method Detail

initInitialNativeThread

public static void initInitialNativeThread()

Initialize the initial native thread. Must be the first thing called at virtual machine startup.

initNativeThreads

public static void initNativeThreads(jq_NativeThread nt,
                                     int num)

Initialize the extra native threads.

Parameters:

nt - initial native thread

num - number of native threads to initialize

startNativeThreads

public static void startNativeThreads()

Start up the extra native threads.

allNativeThreadsInitialized

public static boolean allNativeThreadsInitialized()

Returns true iff all native threads are initialized.

getCurrentThread

public jq_Thread getCurrentThread()

Returns the jq_Thread that is currently running on this native thread.

getCodeAllocator

public CodeAllocator getCodeAllocator()

Get the native thread-local code allocator.

getHeapAllocator

public HeapAllocator getHeapAllocator()

Get the native thread-local heap allocator.

getCurrentJavaThread

public jq_Thread getCurrentJavaThread()

Get the currently-executing Java thread.

resume

public void resume()

Starts up/resumes this native thread.

suspend

public void suspend()

Suspends this native thread.

getContext

public boolean getContext(jq_RegisterState r)

Gets context of this native thread and puts it in r.

setContext

public boolean setContext(jq_RegisterState r)

Sets context of this native thread to r.

startJavaThread

public static void startJavaThread(jq_Thread t)

Put the given Java thread on the queue of the least-busy native thread.

endCurrentJavaThread

public static void endCurrentJavaThread()

End the currently-executing Java thread and go back to the scheduler loop to pick up another thread.

nativeThreadEntry

public void nativeThreadEntry()

The entry point for new native threads.

schedulerLoop

public void schedulerLoop()

dumpStatistics

public static void dumpStatistics()

dumpStats

public void dumpStats()

threadSwitch

public void threadSwitch()

Thread switch based on a timer or poker interrupt.

yieldCurrentThread

public void yieldCurrentThread()

Thread switch based on explicit yield.

yieldCurrentThreadTo

public void yieldCurrentThreadTo(jq_Thread t)

toString

public String toString()

Overrides:

toString in class Object

getIndex

public int getIndex()

ctrl_break_handler

public static void ctrl_break_handler()

dumpAllThreads

public static void dumpAllThreads()

initBreakThread

public static void initBreakThread()

suspendAllThreads

public static void suspendAllThreads()

resumeAllThreads

public static void resumeAllThreads()

dump

public void dump(jq_RegisterState regs)

getReadyQueue

public jq_ThreadQueue getReadyQueue(int i)

getIdleQueue

public jq_ThreadQueue getIdleQueue()

getTransferQueue

public jq_ThreadQueue getTransferQueue()