Add Apex.OS Polling Subscription communicator

Erik Sniderrequested to merge
apex-os-master into master

This MR contains all the changes from the apex-os branch necessary to support the Apex.OS Polling Subscription communicator. After this is merged, the apex-os branch can be deleted, and the master branch will be usable with Apex.OS (though it will have to be manually enabled with --cmake-args -DPERFORMANCE_TEST_APEX_OS_POLLING_SUBSCRIPTION_ENABLED=ON).

  • Add ApexOSPollingSubscription plugin
  • Extract the std::chrono::steady_clock to the perf_clock alias
  • Use std::chrono::system_clock on QNX
  • Other misc changes for QNX compatibility
  • Add a couple of small changes for APEX_CERT compatibility
Edited by Erik Snider

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