Chenbo Feng 876218abcb Ask netd to swap stats map before reading
To avoid protentail race problem between netd and system_server when
reading the network stats map. Always inform netd before reading the
stats and let netd to do a swap between active stats map and inactive
stats map. So the system_server can safely remove the stats after
reading.

Bug: 126620214
Test: android.app.usage.cts.NetworkUsageStatsTest
      android.net.cts.TrafficStatsTest

Change-Id: I8fa37c26bec23ffca0b29b679e72ba1189f557f1
2019-04-10 12:59:38 -07:00
Description
android_packages_modules_Connectivity
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