f70fbc8411
This change introduces a new non-reentrant mutex to WebRTC. It enables eventual migration to Abseil's mutex. The mutex types supportable by webrtc::Mutex are - absl::Mutex - CriticalSection (Windows only) - pthread_mutex (POSIX only) In addition to introducing the mutexes, the CL also changes PacketBuffer to use the new mutex instead of rtc::CriticalSection. The method of yielding from critical_section.cc was given a mini-cleanup and YieldCurrentThread() was added to rtc_base/synchronization/yield.h/cc. Additionally, google_benchmark benchmarks for the mutexes were added (test courtesy of danilchap@), and some results from a pthread/Abseil shootout were added showing Abseil has the advantage in higher contention. Bug: webrtc:11567, webrtc:11634 Change-Id: Iaec324ccb32ec3851bf6db3fd290f5ea5dee4c81 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176230 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31443}
Build overrides in GN
This directory is used to allow us to customize variables that differ between WebRTC being built as standalone and as a part of Chromium.
There's another build_overrides in Chromium that needs to contain the same set of files with the same set of variables (but with different values).