tree d3658ea10a0f594be5f08de0381ec981a867fc8a
parent 8a85012bc47ebb3e985839d1cb7c699d325ff279
author David Benjamin <davidben@google.com> 1673225003 -0800
committer Boringssl LUCI CQ <boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com> 1684271147 +0000

Add an atomics library to crypto/internal.h

refcount.c is now a single, generic file that calls into C11-atomic-like
APIs. Behind the scenes, this selects one of C11 atomics, Windows
interlocked APIs, or unsynchronized reads/writes (in the no-threads
build).

This frees us up to use atomics elsewhere in the library. For now, this
only binds sequentially consistent atomics, but we can add other memory
orders if needed. In particular, I believe up_ref only needs relaxed
atomics. Some of the later change I think only need acquire and release,
but I'm not positive.

Bug: 570
Cq-Include-Trybots: luci.boringssl.try:linux_clang_rel_tsan
Change-Id: Ifcd7357611bb7a8cd14b82c23ad080d1a2df1386
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/59848
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>