ptolemy.domains.sdf.optimize

Class OptimalScheduleFinder._Channel

java.lang.Object

ptolemy.domains.sdf.optimize.OptimalScheduleFinder._Channel

Enclosing class:

OptimalScheduleFinder

protected static class OptimalScheduleFinder._Channel
extends java.lang.Object

the state of the channel in the channel array has one integer at stateIndex indicating the number of tokens in the channel and another integer at stateIndex+1 indicating how many consumer are still to read the token I need to remember per receiver how many tokens there are for that receiver. If a token is produced, then the value increases for all consumers. When a consumer reads it decreases only for that consumer.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	_numberOfConsumers The number of actors consuming from this channel.
(package private) int	_stateIndex Index of this channel into the global state vector.
(package private) int	initialTokens The number of initial tokens on the channel.

Constructor Summary

Constructors

Constructor and Description
_Channel() Construct a instance of Channel and initialize nrConsumers to 0.

Method Summary

Modifier and Type	Method and Description
(package private) void	addTokens(OptimalScheduleFinder._State state, int rate) Add new tokens into the channel.
(package private) int	assignPortIndex() Called for any input port to be connected to the channel.
(package private) int	assignStateIndex(int index) Assign stateIndex and returns the next available index to be assigned to the next channel, depending on the number of consumers of this channel.
(package private) int	channelSize(OptimalScheduleFinder._State state) return the amount of memory taken by the channel content.
(package private) int	exclusiveTokens(int portIndex, OptimalScheduleFinder._State state) Get the number of exclusively available tokens to the consuming port with index 'portIndex' in state 'state'.
(package private) void	removeTokens(OptimalScheduleFinder._State state, int portIndex, int rate) Remove tokens from the channel for given port.
(package private) void	setInitialState(OptimalScheduleFinder._State state) Initialize the state 'state' to this channel's initial state by putting the appropriate number of initial tokens in it.
(package private) int	tokens(int portIndex, OptimalScheduleFinder._State state) Get the number of available tokens to the consuming port with index 'portIndex' in state 'state'.

Methods inherited from class java.lang.Object

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

Field Detail

initialTokens

int initialTokens

The number of initial tokens on the channel.

_numberOfConsumers

int _numberOfConsumers

The number of actors consuming from this channel.

_stateIndex

int _stateIndex

Index of this channel into the global state vector.

Constructor Detail

_Channel

_Channel()

Construct a instance of Channel and initialize nrConsumers to 0.

Method Detail

assignStateIndex

int assignStateIndex(int index)

Assign stateIndex and returns the next available index to be assigned to the next channel, depending on the number of consumers of this channel.

Parameters:

index - state index for the channel

Returns:

index for the next component

assignPortIndex

int assignPortIndex()

Called for any input port to be connected to the channel. Returns an index into the state vector for this port to manage the number of remaining tokens to be read.

Returns:

index for the new port

tokens

int tokens(int portIndex,
           OptimalScheduleFinder._State state)

Get the number of available tokens to the consuming port with index 'portIndex' in state 'state'.

Parameters:

portIndex - port index

state - state

Returns:

the number of available tokens in the channel to port with index i

exclusiveTokens

int exclusiveTokens(int portIndex,
                    OptimalScheduleFinder._State state)

Get the number of exclusively available tokens to the consuming port with index 'portIndex' in state 'state'.

Parameters:

portIndex - port index

state - state

Returns:

the number of exclusively available tokens in the channel to port with index i

addTokens

void addTokens(OptimalScheduleFinder._State state,
               int rate)

Add new tokens into the channel.

Parameters:

state - state to be updated

rate - number of tokens to add

removeTokens

void removeTokens(OptimalScheduleFinder._State state,
                  int portIndex,
                  int rate)

Remove tokens from the channel for given port.

Parameters:

state - state to be updated

portIndex - port index

rate - number of tokens to remove

setInitialState

void setInitialState(OptimalScheduleFinder._State state)

Initialize the state 'state' to this channel's initial state by putting the appropriate number of initial tokens in it.

Parameters:

state - state to be initialized

channelSize

int channelSize(OptimalScheduleFinder._State state)

return the amount of memory taken by the channel content. which is the maximum number of tokens still to be read by any consumer

Parameters:

state - state

Returns:

amount of memory occupied by channel content