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Commit acae3c0f authored by JW Wang's avatar JW Wang
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Ensure mutation to multiple objects is done atomically 

Acquire both parent and child locks before mutation begins.
This ensures no concurrent mutation is possible on another thread.

Bug: 161954235
Test: atest StagedInstallTest AtomicInstallTest
Change-Id: If4b83ef83bbe7e85e91a6b8f16e01d4dc0d6d8e6
parent be703849
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