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The Mac OS X architecture
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Figure 1.5 Drawers slide out from their parent window, enabling access to frequently used application features or information.
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To take full advantage of the keyboard, open the System Preference program, select the Keyboard pane, select the Full Keyboard Access tab, and make sure the Turn On Full Keyboard Access checkbox is checked. The Use Control With menu enables you to change the keys associated with each command. Now, you can use the keyboard to select interface elements such as application menus and the Dock.
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1.3.8 Other interface features
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Mac OS X includes lots of other interface features, including transparent windows and menus that let you see through a window or menu to what is behind it. The appearance of icons and lists has improved, and there s a new help system and a new system font.
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1.4 The Mac OS X architecture
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From a user s point of view, the Mac OS X system is its user interface, applications, and services. For developers, however, the interface is simply a facade; behind it exists the Mac OS X operating system, a complex web of software that handles the interactions between user requests and computing resources.
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Welcome to Mac OS X
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The heart of this system software is the kernel. The kernel provides the operating system s basic computing services such as interrupt handling, processor and memory management, and process scheduling. Two types of kernels form the basis for most operating systems: the monolithic kernel and the microkernel. A monolithic kernel encapsulates nearly all the operating system layers within one program, which runs in kernel space. A microkernel implements a subset of operating system services, runs in kernel space, and is much smaller than the monolithic kernel. Additional services, implemented on top of the kernel as user programs (running in user space), export well-defined interfaces and communication semantics. To perform a service that resides outside of kernel space, the kernel communicates with the user-level service through message passing. Generally, a monolithic kernel is faster but larger than a microkernel. The original Mac OS was more a collection of cooperating system services, whose design did not divide neatly into user and kernel domains. In addition, its handling of critical operating system tasks such as memory management and process management was showing its age, which led Apple to look into alternatives for its future OS. For example, most of us are familiar with operating systems that use preemptive multitasking and fixed-process scheduling policies. Under UNIX, one policy is for the process scheduler to divide CPU time into time slices, assigning each process a quantum of CPU time. If the running process has not terminated by the end of its quantum, the operating system will switch processes by preempting the running process and activating the next. Contrast this to Mac OS, which implemented a scheduling called cooperative multitasking. It works as follows: when you run a program, the operating system loads the program into memory, schedules it for execution on the CPU, and runs the program only when the currently running program surrenders the CPU. It is the responsibility of each program, not the operating system, to occasionally hand over the CPU to allow other programs to run. As you can imagine, this scheduling is suboptimal, because one rogue program can monopolize the CPU and disallow others from running. Mac OS X is built on UNIX, and therefore uses preemptive multitasking; the kernel manages process-scheduling policies. Another difference between Mac OS X and earlier Macintosh systems is memory management. Mac OS did not enforce memory protection of the system or application partitions. Applications were free to write to memory outside their own address space and could potentially take down other applications, as well as the entire system. Under Mac OS X, this is not possible: accessing memory outside a program s address space will result in a segment fault and the process will dump core, but it will not take down the operating system or other processes with it.
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