Improve PackageInstallerService.writeSessionsLocked lock hold
PackageInstallerService.writeSessionsLocked() holds mSession lock, the method PackageInstallerSession.write() needs to access the mLock in PackageInstallerSession that may be held by other process to execute a long operation this may cause long API calls that may need to wait for mSession lock. To improve the problem, try to reduce lock holding time, copy session to a local variable. The code doesn't need to acess mLock in mSession lock to reduce the API call ANR. Bug: 317945057 Test: manual Change-Id: Ief0c97d627bebb9075f4bc6b94870d40dcb7bb4f
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