This CL integrates the new ScopedSpinGuard with the new
LengthDelimitedRingBuffer into a new class, RingBufferAnnotation.
RingBufferAnnotation is thread-safe both for reading and writing, and is
suitable for streaming logs, trace events, and other high-throughput
data streams.
I included a load test (ring_buffer_annotation_load_test) which launches
two threads which simultaneously write to and read from the
RingBufferAnnotation.
By default, reads and writes are serialized using ScopedSpinGuard, but
passing the flag "--disable_spin_guard" to the test disables the spin
guard on the reading side (which is expected to make the test fail).
Change-Id: Ic8e28866d085d57e778c4f86bcb7492ef0638ab9
Bug: crashpad:437
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/4023619
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Ben Hamilton <benhamilton@google.com>
