... 20 years operating systems and their environments haveundergone dramatic expansion in size, scope and complexity. The Alto operatingsystem [22], a workstation operating system of the early ... their applications. The first is a filesystem with aread/copy -on- write interface, which uses the minimal subset of the memory management interface. The second isan excerpt from the operation ... this example, the shared memory server may be located on either of the clients’ hosts, or on yetanother host.In the second frame, each client takes a read fault onthe same page of the shared...
... responses are scored. They are usually written before the tests and then the test is written onthe basis of the specifications. After the test is written, the specification should be consulted ... the ground of a carefully constructed test specification. Second, these test items should be carefully taken into consideration regarding the relevance to the course book content and then only ... relevant to the ones that the students have already learnt. * Functional language section This section includes 20 items of business situations. The function of language in these situations is...
... are posted to the applica-tion. One by one the application pulls these messages from itsqueue and handles each by moving one window. While that’s going on, the code that creates the new window ... application connects to the Application Server, and can makeuse of all the services provided by that server. Tasks handled by the ApplicationServer include the provision of windows, the handling ... handling of the interaction betweenthese windows, and the monitoring and reporting of user events such as mousebutton clicks. In short, the Application Server, and indirectly the classes of the Application...
... control is in the hands of the user. Once the user confirms a choice (whether it’s a file selection in the Openfile panel, a click onthe Save button in the Save file panel, or a click onthe ... invoked only by other MyHelloWindowmember functions, so there’s no need to allow outside access to it. Because all of the code from the original version of the MyHelloWindow constructor, with the exception ... code}Almost all of the code found in the original version of the MyHelloWindow con-structor has been moved to InitializeWindow(), so the original, one-argumentversion of the constructor shrinks...
... directly onthe computer. On the other hand, the TOEFL exam is a long one, and concentrating in front of a computer monitorfor hours may be taxing. If you have little experience with computers, ... performed onthe exam.You will see your scores for the Listening Comprehension and Reading Comprehension sections. Your Struc-–NOTES ONTHE TOEFL–133 On Test Day The Educational Testing ... all questions are “real” and do your best on all of them. The time you will have for each section willbe proportional to the number of questions, so don’t worry that the research questions will...
... variablepthreadcondwait Wait on a condition variablepthreadcondsignal Release one thread waiting on a condition variableFigure ... (MMU hardware)ContextValidPhysicalpageVirtualpagetagFlags(b)(c)Format isentirelydefined by the operating system Translation table (Operating system) TSB (MMU + sofware)ContextEntry ... producer( ); // create the producerc = new consumer( ); // create the consumerp.start( ); // start the producerc.start( ); // start the consumer}// This is a utility function for circularly incrementing...
... is the universal generating function of the system; is the number of subsystems in the system; NsysM is the number of possible states of the system; sG is the performance of the system; ... multi-state system theory to the reliability analysis of the power system is studied. The relationship between the performance of thesystem and the performance of the batteries is analyzed. The results ... of the battery are defined. The reliability of the power system is estimated by the multi-state system theory. The results show that thesystem reliability estimated by the traditional system...
... class). Invoking the BApplication constructor is necessary for a few reasons. The BApplicationconstructor:ã Connects the application to the Application Serverã Provides the application with a unique ... for the programã Sets the global variable be_app to point to the new application object The connecting of an application to the Application Server has already been men-tioned. This connection ... environ-ment theoperatingsystem can, and does, preempt currently running applications.With preemptive multitasking, the burden of passing control from one program toanother falls onthe operating...
... shadingadded by the BeOS).You’ll treat the large and small versions of an icon separately—editing one ver-sion has no effect onthe other version. IconWorld will assign the larger version aresource ... the manyBView member functions. These functions are the constructor function, the AttachedToWindow() function, and the Draw() function. The HelloView classdefined in the HelloWorld project does ... by the HelloWorld program, the program passes to the HelloView constructor the size and name the view is tohave. The HelloView constructor will in turn pass that information on to the BView constructor...
... application in essence extends the functional-ity of the Be operating system. Thesystem is responsible for calling a hook func-tion, while your application is responsible for defining the functionality ... ofnon-routine instructions are executed. These instructions ensure thatcontrol is properly moved from the calling function to the calledfunction and then back to the calling function. The ... throughout the book. See the description of the Support Kitbelow for a specific example concerning the BLocker class.Application Kit The classes of the Application Kit communicate with the Application...
... "MyHelloView"); AddChild(fMyView); BFont theFont = be_plain_font; int32 theSize = 12; SetHelloViewFont(theFont, theSize); Show();} The call to SetHelloViewFont() results in the about-to-be shown window ... in the above version of the MyHelloWindow constructor, the view’s font information is set twice, almost in succession. The result is thatwhen the view is displayed, the last calls to SetFont() ... at the time of the mouse button click. The window that receives the message calls the BViewhook function MouseDown() of the view the cursor was over at the time of the mouse button click.B_MOUSE_UPReaches...
... effort on your part. The reason this handy feature works is that the BControl class over-rides the BView class member function KeyDown(), and in turn the BColorControl class overrides the BControl ... selected in the color con-trol. The selection of this color and the drawing of the bar are handled by the MyDrawView version of the MouseDown() routine. Besides overriding the Bviewhook function MouseDown(), ... function FillRegion(). Here, the region that was created in the previous snippet is filled with the default B_SOLID_HIGH pattern:FillRegion(aRegion); The BRegion object keeps track of all of the...
... withthat one control. Also, add the control to a window. When the user operates the control (typically by clicking on it, as for a button), thesystem passes the applica-tion-defined message to the ... want the control on (to check a checkbox or fill in a radio button), invoke the BControl member function SetValue(). Passing SetValue() the Be-definedconstant B_CONTROL _ON sets the control to on. ... radio button is turned off. A group of radio buttons mustalways have one button on, so after the three radio buttons are created, one ofthem (arbitrarily, the One Beep button) is turned on by calling...
... twobeeping options. A subsequent click onthe Beep button sounds thesystem beepeither once or twice, depending onthe currently selected menu item.Figure 7-9. A menu with related options 270 Chapter ... function becomes responsible for carrying out the actionassociated with the menu item. The third BMenuItem constructor parameter, shortcut, is optional. The defaultvalue used by the constructor ... drawings.Preparing the window class for a menubar and controlBoth the push button control and the one menu item require the definition of amessage constant:#define BUTTON_BEEP_MSG 'beep'#define...
... window Fonts 277object. Pass the BFont constructor one of the three global system fonts and the constructor will return a copy of it to your application:BFont theFont(be_bold_font); The BFont object ... partiallisting of the BFont class:class BFont { public: BFont(); BFont(const BFont &font); BFont(const BFont *font); void SetFamilyAndStyle(const font_family family, const font_style style); ... to the right. The following code generates the three strings shown in Figure 8-3:BFont theFont(be_plain_font);theFont.SetSize(24.0);theFont.SetShear(45.0);theView->SetFont(&theFont);theView->MovePenTo(110.0,...