OS X and IOS Kernel Programming by Ole Henry Halvorsen Douglas Clarke

Author:Ole Henry Halvorsen, Douglas Clarke [Ole Henry Halvorsen, Douglas Clarke]
Language: eng
Format: epub
Tags: Computers, Computer Engineering
ISBN: 9781430235361
Publisher: Apress
Published: 2011-12-28T05:00:00+00:00

IOReturn com_osxkernel_driver_IOKitTest::setPowerState (unsigned long powerStateOrdinal,

IOService* device)

{

// If lowering the power state, update the saved power state before powering down the

// hardware

if (powerStateOrdinal < m_devicePowerState)

m_devicePowerState = powerStateOrdinal;

switch (powerStateOrdinal)

{

case kOffPowerState:

case kStandbyPowerState:

case kIdlePowerState:

// Wait for outstanding IO to complete before putting device into a lower

// power state

IOLockLock(m_lock);

while (m_outstandingIO != 0)

{

IOLockSleep(m_lock, &m_outstandingIO, THREAD_UNINT);

}

IOLockUnlock(m_lock);

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