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PRISM Manual | ThePRISMLanguage / GlobalVariables
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<p><a class='wikilink' href='Main.html'>The PRISM Language</a> /
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</p><h1>Global Variables</h1>
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<p>In addition to the local variables belonging to each module, a PRISM model can also include <em>global variables</em>,
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which can be written to, as well as read, by all modules.
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Like local variables, these can be integers or Booleans.
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Global variables are declared in identical fashion to a module's local variables,
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except that the declaration must not be inside the definition of any module.
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Some example declarations are as follows:
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<div class='sourceblock ' id='sourceblock1'>
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<div class='sourceblocktext'><div class="prism"><span class="prismkeyword">global</span> <span class="prismident">g</span> : [<span class="prismnum">1</span>..<span class="prismnum">10</span>];<br/>
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<span class="prismkeyword">global</span> <span class="prismident">b</span> : <span class="prismkeyword">bool</span> <span class="prismkeyword">init</span> <span class="prismkeyword">true</span>;<br/>
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</div></div>
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<div class='sourceblocklink'><a href='http://www.prismmodelchecker.org/manual/ThePRISMLanguage/GlobalVariables?action=sourceblock&num=1' type='text/plain'>[$[Get Code]]</a></div>
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<p class='vspace'>A global variable can be modified by any module and provides another way for modules to interact.
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An important restriction on the use of global variables is the fact that commands which synchronise with other modules
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(i.e. those with an action label attached; see the section "<a class='wikilink' href='Synchronisation.html'>Synchronisation</a>") cannot modify global variables.
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PRISM will detect this and report an error.
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<h3><a class='wikilink' href='../Main/Main.html'>PRISM Manual</a></h3>
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<p><strong><a class='wikilink' href='Main.html'>The PRISM Language</a></strong>
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</p><ul><li><a class='wikilink' href='Main.html'>Introduction</a>
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</li><li><a class='wikilink' href='Example1.html'>Example 1</a>
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</li><li><a class='wikilink' href='ModelType.html'>Model Type</a>
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</li><li><a class='wikilink' href='ModulesAndVariables.html'>Modules And Variables</a>
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</li><li><a class='wikilink' href='Commands.html'>Commands</a>
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</li><li><a class='wikilink' href='ParallelComposition.html'>Parallel Composition</a>
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</li><li><a class='wikilink' href='LocalNondeterminism.html'>Local Nondeterminism</a>
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</li><li><a class='wikilink' href='CTMCs.html'>CTMCs</a>
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</li><li><a class='wikilink' href='Example2.html'>Example 2</a>
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</li><li><a class='wikilink' href='Constants.html'>Constants</a>
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</li><li><a class='wikilink' href='Expressions.html'>Expressions</a>
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</li><li><a class='wikilink' href='Synchronisation.html'>Synchronisation</a>
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</li><li><a class='wikilink' href='ModuleRenaming.html'>Module Renaming</a>
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</li><li><a class='wikilink' href='MultipleInitialStates.html'>Multiple Initial States</a>
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</li><li><a class='selflink' href='GlobalVariables.html'>Global Variables</a>
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</li><li><a class='wikilink' href='FormulasAndLabels.html'>Formulas And Labels</a>
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</li><li><a class='wikilink' href='PTAs.html'>PTAs</a>
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</li><li><a class='wikilink' href='CostsAndRewards.html'>Costs And Rewards</a>
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</li><li><a class='wikilink' href='ProcessAlgebraOperators.html'>Process Algebra Operators</a>
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