gpss_manual

An SNA where the entity, row or column is specified by indirect addressing.

MatrixSNA :==DirectMatrixSNA | IndirectMatrixSNA

Any MX class SNA.

SNA :==DirectSNA | IndirectSNA

Simpleterm :==Name | SNA | SignedNumber

Simplest items in an expression.

MathFunction :== ABS | ATN | COS | EXP | INT | LOG | RND | SIN | SQR | TAN

Mathematical routines in the math library. these may be used to build expressions.

MathFunctionTerm :==MathFunction(Expression)

A call to a math library subroutine with an expression as the argument.

BinaryOperator :== + | - | # | / | \ | ^

Addition, subtraction, multiplication, division, integer division, and exponentiation. The [*] symbol is reserved for indirect addressing. ]#] represents multiplication and ^ represents exponentiation.

BlockName :==

ADOPT | ADVANCE | ALTER |

ASSEMBLE | ASSIGN | BUFFER | CLOSE | COUNT | DEPART |

ENTER | EXAMINE | EXECUTE | FAVAIL | FUNAVAIL | GATE |

GATHER | GENERATE | INDEX |

INTEGRATION | JOIN | LEAVE |

LINK | LOGIC | LOOP | OPEN |

MARK | MATCH | MSAVEVALUE |

OPEN | PLUS | PREEMPT |

PRIORITY | QUEUE | READ |

RELEASE | REMOVE | RETURN |

SAVAIL | SAVEVALUE | SCAN |

SEEK | SEIZE | SELECT | SPLIT |

SUNAVAIL | TABULATE |

TERMINATE | TEST | TRACE |

TRANSFER | UNLINK | UNTRACE | WRITE

GPSS block names.

LogicSwitchOp :== I | R | S

The operators used in the operator field of LOGIC blocks: I

(invert), R (reset), or S (set).

RelationalOp :== E | G | GE | L | LE | NE

The relational operators used in the operator field of certain

GPSS blocks: E (equal), G (greater than), GE (greater than or equal to), L (less than), LE (less than or equal to), NE (not equal to).

ConditionalOp :== E | G | GE | L | LE | MAX | MIN | NE

The conditional operators used in the operator field of certain GPSS blocks: E (equal), G (greater than), GE (greater than or equal to), L (less than), LE (less than or equal to), MAX

(maximum), MIN (minimum), NE (not equal to).

GateOp :== FNV | FV | I | LS | LR | M | NI | NM | NU | SE | SF |

SNE | SNF | SNV | SV | U

The operators used in the operator field of GATE blocks. The operators specify a test condition and an entity type. The operators are:

∙ FNV Facility must be not available.

∙FV Facility must be available. · ∙ I Facility must be preempted.

∙LS logicswitch must be set.

∙LR logicswitch must be reset.

∙M MATCH block must have a Transaction of the same assembly set as the Active Transaction.

∙NI Facility must not be currently preempted.

∙NM MATCH block must NOT have a

Transaction of the same assembly set as the Active Transaction.

∙NU Facility must not be in use.

∙SE Storage must be empty.

∙SF Storage must be full.

∙SNE Storage must be not empty.

∙SNF Storage must be not full.

∙SNV Storage must be not available.

∙SV Storage must be available.

∙U Facility must be in use.

LineNumber :== Number CommandName :==

BVARIABLE | CLEAR | CONDUCT | CONTINUE | EQU | EXIT | FUNCTION | FVARIABLE | HALT |

INCLUDE | INITIAL | INTEGRATE |

MATRIX | QTABLE |

REPORT | RESET |

RMULT | SHOW |

START | STEP | STOP | STORAGE | TABLE | VARIABLE

GPSS Commands do not define block entities. They set the conditions of the simulation and define other GPSS entities.

Verb :== BlockName | CommandName

Statement specific syntax is discussed in Chapters 3, 6, 7, and 8.

1.2. PLUS Grammar

Procedure :=

PROCEDURE ProcedureName ( FormalArgumentList ) Statement

Experiment :=

EXPERIMENT ProcedureName ( FormalArgumentList ) Statement

Statement := CompoundStatement | IfStatement | IfElseStatement | WhileStatement | AssignStatement |

GotoStatement | ReturnStatement | ProcedureCallStatement |

LabeledStatement | TempDeclarationStatement

LabeledStatement := Label Statement Label := Name :

TempDeclarationStatement :=TempVarDeclareStatement |

TempMatrixDeclareStatement TemporaryVarDeclareStatement := TEMPORARY NameList ;

TempMatrixDeclareStatement :=

TEMPORARY MATRIX name [ IntegerList ] ;

CompoundStatement := BEGIN StatementSequence END ;

FormalArgumentList := Name [ , Name ] ... | NULL StatementSequence := Statement [ Statement ] ... | NULL

AssignStatement := Lvalue = Expression ;

IfStatement := IF ( Expression ) THEN Statement

IfElseStatement :=

IF ( Expression ) THEN Statement ELSE Statement

WhileStatement: WHILE ( Expression ) DO Statement

GotoStatement := GOTO LabelName ;

ReturnStatement := RETURN [ Expression ] ;

ProcedureCallStatement := ProcedureCall ;

ProcedureCall := ProcedureName( ExpressionList )

ProcedureName := LibraryProcedureName | Name

FormalArgumentList := Name [ , Name ] ... | NULL

StatementSequence := Statement [ Statement ] ... | NULL

ExpressionList := Expression [ , Expression ] ...

ExperimentName := Name

ModelName := Name

StringConstant := " [Character ]..."

ParenthesizedExpression := ( Expression )

Expression := Expression | SuperResult

:= SuperResult

SuperResult := SuperResult & InterResult

:= InterResult

InterResult := InterResult = SubResult

:= InterResult /= SubResult

:= SubResult

SubResult := SubResult < Comparator

:= SubResult > Comparator

:= SubResult <= Comparator

:= SubResult >= Comparator

:= Comparator

Comparator := Comparator + Term

:= Comparator - Term

:= Term

Term := Term # Factor

:= Term / Factor

:= Term \ Factor

:= Term @ Factor

:= Factor

Factor := Factor ^ Factor

:= - Factor

:= + Factor

:= Number

:= GeneriicDatum

:= TextString

:= ParenthesizedExpression

:= ProcedureCall

:= FunctionCall

:= SNA

GenericDatum := Name

:= ArrayElement

ArrayElement := Name [ ExpressionList ]

LValue := Name

:= Name [ ExpressionList ]

Glossary

Active Transaction - That GPSS Transaction in a simulation

which is at the Head of the Current Events Chain and is the next to attempt entry into a GPSS Block.

Command File - A Secondary Model File intended for

interactive use. A Function Key loaded with an INCLUDE Statement can run a Control File with a single keystroke.

Data Stream - A sequence of text lines identified by a unique positive integer.

Entity Label - A Named Value used in the Label field of a GPSS Statement.

GPSS Statement - A GPSS Block Statement or a Command occurring in a single Text Line.

Immediate Command - A Command which when sent to a

Simulation Object is performed immediately and is not placed on the Command Queue. HALT and SHOW are the only Immediate Commands. A HALT Command interrupts any running simulation and deletes all remaining Commands from the Command Queue.

Interactive Statement - A Model Statement sent to an existing simulation.

Manual Simulation Statement - an Interactive Block

Statement, causing a temporary Block to be created, and causing the Active Transaction to attempt entry.

Model - A sequence of Model Statements.

Model File - A file containing Model Statements.

Model File Number - the 0-relative ordinal of the Model File in

the order encountered by the Translator. The Model Object is assigned Model File Number 0.

Model Statement - A GPSS Statement or a PLUS Procedure definition.

Named Value - A user created name used in a model.

PLUS Procedure - A PLUS PROCEDURE Statement obeying the Syntax rules of the PLUS Language.

Primary Model File - A Model File brought into a Model

Window of a GPSS World Session.

Project - A set of Folders (or directories) for holding files

relating to a single modeling activity. Project directories are set in the Configuration Notebook.

Queued Command - A Command which when sent to a

Simulation Object is placed on a Command Queue behind all other Commands waiting to be performed. All Commands except CONDUCT, HALT and SHOW are Queued Commands.

Secondary Model File - A Text Object Translated as a result of an INCLUDE Command.

Session - The Sequence of Events from the Opening to the

Closing of the GPSS World process.

Simulation - The Result of Translation of a model, whose state can be advanced by a Simulation Object.

Statement - A GPSS Statement or a PLUS Statement.

String - A sequence of characters.

Termination Count - The state variable in each simulation

that, when it becomes nonpositive, causes the simulation to end.

Text Line - A Sequence of up to 250 print characters, including

blanks and tabs, terminated by, but not including, a CR LF sequence.

Trace Indicator - A Transaction state variable that causes a

Trace Message to be created by each Block entry.

Translator - That part of the GPSS World Control Process which converts a model into a simulation.

User Variable - A Named Value not occurring in any GPSS Statement Label field.