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OS X and iOS Kernel Programming by Douglas Clarke, Ole Henry Halvorsen

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C H A P T E R  10

Power Management

Power management has become a fundamental feature across all computing devices. Every platform that runs Mac OS X can be put into a lower power mode, and so power management is just as important for a desktop computer that is always connected to a power supply as it is for a laptop or an iPhone that is running from a battery.

Even a Mac Pro, for example, can be placed into “sleep” mode, which puts the computer and its connected peripherals into a low power mode. During sleep mode, the CPU is put into a suspended state, the computer's display is powered off, and the hard drive is spun down. If the computer has PCI expansion slots, these will be powered down during sleep, with only a small amount of auxiliary ...

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