commit e98964d7d287296aeb5619c6f0e2d1f0b868dd3b
author Chenbo Feng <fengc@google.com> Thu Apr 11 18:44:45 2019 -0700
committer Lorenzo Colitti <lorenzo@google.com> Tue Apr 23 14:21:05 2019 +0000
tree 485d96e3b10f145edd0a2d078918b4a92c73e00e
parent 578bd7f966c79a95f4c539fd941147203b8274db

Add a lock to protect persistent stats snapshot

Since the network stats could be polled from multiple services at
runtime, it is not thread safe for networkStatsFactory to hold a
persistent stats snapshot without any protection. Use a internal lock to
prevent concurrent modification on mPersistentSnapshot to fix the
problem.

Bug: 124764595
Test: android.app.usage.cts.NetworkUsageStatsTest
      android.net.cts.TrafficStatsTest

Change-Id: I73851336452110afb74d6dd1ca5e50047d5b3d4a
Merged-In: I73851336452110afb74d6dd1ca5e50047d5b3d4a
Merged-In: I22afb46f17697e8b6359d4f593802e0f4b95db8b
(cherry picked from commit 180c020966422bcd127de0adb7b1042534ac5baf)