Add accessor functions for cb_buf, which enforce locking and unlocking

Part of #31614 (moved)

changed milestone to %Tor: 0.4.2.x-final

Trac:
Parent Ticket: #31614 (moved)

added 042-should BugSmashFund actualpoints::0.2 component::core tor/tor diagnostics milestone::Tor: 0.4.2.x-final no-backport owner::teor parent::31614 points::0.2 priority::medium regression resolution::fixed reviewer::dgoulet severity::normal status::closed type::defect version::tor 0.3.5.1-alpha labels

Distributing 0.4.2 tickets between network team members.

Trac:
Status: new to assigned
Owner: N/A to teor

This ticket depends on #31614 (moved) and #31594 (moved). I don't think we'll backport both of those branches, so I'm marking this one as no-backport.

See my PR:

• master: https://github.com/torproject/tor/pull/1379

Trac:
Actualpoints: N/A to 0.2
Status: assigned to needs_review
Points: N/A to 0.2
Keywords: 040-backport-maybe, 041-backport-maybe, consider-backport-after-042-stable, 035-backport-maybe, consider-backport-if-needed deleted, no-backport added

Trac:
Reviewer: N/A to dgoulet

LGTM!

Trac:
Status: needs_review to merge_ready

Merged!

Trac:
Status: merge_ready to closed
Resolution: N/A to fixed

closed

changed time estimate to 1h 36m

added 1h 36m of time spent

mentioned in issue #31614 (moved)

moved to tpo/core/tor#31734 (closed)