... with system messages—messages generated
and dispatched by the system. The Message Protocols appendix of the Be Book
defines all thesystem messages. In short, system messages fall into the following
categories:
Application ... posted message becomes the next in the queue, the looper invokes
DispatchMessage() to pass the message to the target handler. The effect is for
the posted message to reach the target handler’s ... sev-
eral examples of the creating of messages and the dispatching of these messages
both by the object that created them and by other objects.
Figure 9-1. The inheritance hierarchy for the Application...
... For the Save file panel, the display of the panel comes when the user
chooses the Save As item from the File menu. In response to the message issued
by thesystem to the appropriate MessageReceived() ... control is in the hands of
the user. Once the user confirms a choice (whether it’s a file selection in the Open
file panel, a click on the Save button in the Save file panel, or a click on the Can-
cel ... in either type of panel), a message is automatically sent by the system
to the panel’s target. By default the panel’s target is the application object, but this
can be changed (either in the BFilePanel...
...
4.0-compliant browser, the data is sent in XML format to the client
computer. If the user sorts or queries the data, the operation is performed
locally on the client; thereby increasing the process time ... starts and displays the administrator's Inbox. Note the items in the
Inbox. These items are stored in the Web Storage System.
4. If the Folder List is not displayed, on the View menu, click ... In the Folder List pane, click Calendar.
Note the appointment items in the Calendar. These items are stored in the
Web Storage System.
6. In the Folder List pane, click Contacts.
Note the...
... special
file systems such as the /proc file system, this is none.
n
The second element is the mount point, the place in the root file system at which
the file system contents appear. For the root file system ... and File Systems
The /proc file system also contains information about the disk drives present in the
system and the file systems mounted from them.
7.5.1 File Systems
The /proc/filesystems entry ... scheduled to run rather than being blocked
in a system call—and the total number of processes on thesystem .The final entry is
the process ID of the process that most recently ran.
The /proc/uptime...
... during the execution of a program. An
object can be added or deleted from the heap without regard for its
placement in the heap, or for the other contents of the heap. The
stack, on the other hand, ... such tasks. The zoom-
ing and moving of windows is handled by the system, not by the SimpleApp code.
This simple demonstration emphasizes the power of the BeOS system software—it
is thesystem software ... window’s tab)
• The type of the window (the look and feel of the window)
• The behavior of the window (whether it has a resize knob, and so forth)
Recall from your C++ background that when the definition...
... file with the same name as the project (and
thus the same name as the application that will be built from the project). The
header file holds the definition of the class derived from the BApplication ... any
resizing of the window. The final BView constructor parameter determines the
types of notifications the view is to receive from the system. The Be constant
B_WILL_DRAW means that the view should ... stated that the header file that bears the name of the project should hold
the declaration of the project’s application class the class derived from the
BApplication class. Here you see that the HelloWorld.h...
... to
another window.
Class Descriptions and the Be Book
The definitive source of information for the many classes that make up the BeOS
software kits is the Be class reference by the programmers of the ... to them, some of
their classes appear throughout the book. See the description of the Support Kit
below for a specific example concerning the BLocker class.
Application Kit
The classes of the ... created in the application constructor, the
MyHelloWindow constructor is responsible for creating a new view, adding the
view to the new window, and then displaying the new window.
The new MyHelloWorld...
... was clicked. The values of the point are in the view’s coor-
dinate system. For example, if the cursor was over the very top left corner of the
view at the time of the mouse click, the point’s ... If the point (100.1, 49.9) is used instead, the result is the same the win-
dow’s corner ends up 100 pixels from the left and 50 pixels from the top of the
screen.
The above scenario begs the ... the window (to the top view), rather than
to another view, so both views are on the same level in the window’s view hierar-
chy. The Draw() function of each view type includes code to frame the...
... several versions of Unix. Until a few years ago, there wer e two
main versions: the line of Unix releases that started at AT&T (the latest is
System V Release 4), and another from the University ... and
window systems. Our examples show the bash shell and the GNOME and
KDE window environments. We’ve chosen them because they’re popular
and make good examples, not because we think they’re always the ... advanced work or set up Unix systems for other users, we rec-
ommend learning about a variety of shells and window systems and
choosing the best ones for your needs. The principles explained...
... architectures.
Today, the concept of an extensible operatingsystem is once again gaining acceptance this time as the solution
to the unconstrained growth of UNIX. During the last 20 years operating systems and their ... tasks.
Many other operating systems have met with this problem. Often these systems solve the problem by using inside
knowledge of the algorithms used to manage secondary storage. Unfortunately, the Mach ... of the 8th Symposium on OperatingSystem Principles, pages 64-75. December, 1981.
[16] Rashid, R.F.
From RIG to Accent to Mach: The Evolution of a Network Operating System.
In Proceedings of the...