PowerManagerService

基于android 9

PowerManagerService的主要功能

1. 管理CPU

主要靠mWakeLockSuspendBlocker 实现锁cpu

mWakeLockSuspendBlocker = createSuspendBlockerLocked("PowerManagerService.WakeLocks");

SuspendBlockerImpl-->acquire-->nativeAcquireSuspendBlocker-->acquire_wake_lock

acquire_wake_lock实现在

/hardware/libhardware_legacy/power.c

2.管理屏幕亮暗设置

主要通过mDisplayManagerInternal实现设置屏幕亮暗

mDisplayManagerInternal = getLocalService(DisplayManagerInternal.class);

mDisplayManagerInternal 获取的就是DisplayManagerService的内部类LocalService

mDisplayManagerInternal.requestPowerState