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Commit17e9eca

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Doc: add comments about PreventInTransactionBlock/IsInTransactionBlock.
Add a little to the header comments for these functions to make itclearer what guarantees about commit behavior are provided to callers.(See commitf929441 for context.)Although this is only a comment change, it's really documentationaimed at authors of extensions, so it seems appropriate to back-patch.Yugo Nagata and Tom Lane, per further discussion of bug #17434.Discussion:https://postgr.es/m/17434-d9f7a064ce2a88a3@postgresql.org
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‎src/backend/access/transam/xact.c

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@@ -3338,6 +3338,10 @@ AbortCurrentTransaction(void)
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*a transaction block, typically because they have non-rollback-able
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*side effects or do internal commits.
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*
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*If this routine completes successfully, then the calling statement is
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*guaranteed that if it completes without error, its results will be
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*committed immediately.
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*
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*If we have already started a transaction block, issue an error; also issue
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*an error if we appear to be running inside a user-defined function (which
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*could issue more commands and possibly cause a failure after the statement
@@ -3464,6 +3468,10 @@ CheckTransactionBlock(bool isTopLevel, bool throwError, const char *stmtType)
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*a transaction block than when running as single commands. ANALYZE is
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*currently the only example.
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*
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*If this routine returns "false", then the calling statement is
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*guaranteed that if it completes without error, its results will be
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*committed immediately.
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*
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*isTopLevel: passed down from ProcessUtility to determine whether we are
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*inside a function.
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*/

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