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[net processing] Annotate fPreferHeaders as guarded by g_msgproc_mutex and move to Peer
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Authored by PiRK on Jan 26 2024, 10:19.

Details

Summary

nUnconnectingHeaders, m_headers_sync_timeout, fPreferHeaders and m_recently_announced_headers are currently all CNodeState members even though they are only ever accessed from the message processing thread (therefore sufficiently guarded exclusively by g_msgproc_mutex). CNodeState exists purely to hold validation-specific state guarded by cs_main that is accessed by multiple threads.

This is a partial backport of core#26140
https://github.com/bitcoin/bitcoin/pull/26140/commits/3605011e79d0d43ff532a2c3cc9cad4cc48eb06c
https://github.com/bitcoin/bitcoin/pull/26140/commits/8a2cb1f749ade31bb0655567cd0062db8a7164e5
Depends on D15290

Test Plan

With Debug:

ninja all check-all