Обсуждение: pgsql: Clarify what is protected by WaitLSNLock

Clarify what is protected by WaitLSNLock

Not just WaitLSNState.waitersHeap, but also WaitLSNState.procInfos and
updating of WaitLSNState.minWaitedLSN is protected by WaitLSNLock.  There
is one now documented exclusion on fast-path checking of
WaitLSNProcInfo.inHeap flag.

Discussion: https://postgr.es/m/202404030658.hhj3vfxeyhft%40alvherre.pgsql

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/ee79928441e7e291532b833455ebfee27d7cab5c

Modified Files
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src/backend/commands/waitlsn.c | 10 ++++++++--
src/include/commands/waitlsn.h |  7 +++++--
2 files changed, 13 insertions(+), 4 deletions(-)