Hermes: A Tutorial and Reference Manual - Researcher - IBM
Hermes: A Tutorial and Reference Manual - Researcher - IBM
Hermes: A Tutorial and Reference Manual - Researcher - IBM
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2.AMiniatureSystem33<br />
FIGURE2.2.StructureofaWindowSystemApplication<br />
GetProgram<br />
vokesoneoftheservices:Refocus,Kill,Create,orDispatch.Thefront-<br />
endalsokeepstrackofwhichwindow(ifany)iscurrentlyinfocus. applicationrunninginthatwindow,<strong>and</strong>(2)Quittoshutdownthewindow. managerhasapairofports:(1)InputToWindow,fordirectingdatatothe frontend.ThewindowmanagerprocessservicesWriteToWindowcallsfrom applicationssendinglinestotheirwindow.Foreachwindow,thewindow Thewindowmanagerprocesssupportsthesefourservicescalledbythe Afront-endprocessreadslinesfromtheterminal,parsesthem,<strong>and</strong>in-<br />
thewindow.WhenaQuitcallisreceived,theunboundedbuer<strong>and</strong>the passesGetProgramcalls.Boththeunboundedbuer<strong>and</strong>theadapterare preparedtoreceiveQuitcallswhenthewindowmanagerdecidestokill ItconvertsPutLinecallsintotheappropriateWriteToWindowcalls,<strong>and</strong> linestypedaheadtotheclient,<strong>and</strong>(3)anadapterprocess,Adapter.These processesareshownindetailingure2.2,TheadapterissimilartoFilter. buerprocess,similartotheBoundedBufferdescribedabovewhichstores thesamest<strong>and</strong>ardinterfacefamiliarfromHelloWorld,(2)anunbounded Eachapplicationconsistsofthreeprocesses:(1)theclientitself,with<br />
modules.Herearetheinterfacedenitionsforthewindowmanager: Oncewehavedesignedthemodulestructure,wecanwritethedenitions 2.3Interfaces adaptershutdown,isolatingtheclient<strong>and</strong>thusterminatingit. WMExternal:using(St<strong>and</strong>ard)definitions<br />
InputToWindow<br />
Quit<br />
Quit<br />
quitdispatcher<br />
WriteToWindow<br />
Quit<br />
Buffer GetLine Client PutLine Adapter<br />
GetProgram
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