[PATCH] D26232: [XRay][compiler-rt] XRay Buffer Queue

[Dean Michael Berris via llvm-commits]

dberris created this revision.
dberris added reviewers: majnemer, rSerge, echristo.
dberris added a subscriber: llvm-commits.
Herald added subscribers: mgorny, mehdi_amini.

This implements a simple buffer queue to manage a pre-allocated queue of
fixed-sized buffers to hold XRay records. We need this to support
Flight Data Recorder (FDR) mode. We also implement this as a sub-library
first to allow for development before actually using it in an
implementation.

Some important properties of the buffer queue:

- Thread-safe enqueueing/dequeueing of fixed-size buffers.
- Pre-allocation of buffers at construction.


https://reviews.llvm.org/D26232

Files:
  lib/xray/CMakeLists.txt
  lib/xray/tests/CMakeLists.txt
  lib/xray/tests/unit/CMakeLists.txt
  lib/xray/tests/unit/buffer_queue_test.cc
  lib/xray/tests/unit/xray_unit_test_main.cc
  lib/xray/xray_buffer_queue.cc
  lib/xray/xray_buffer_queue.h

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