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Invent a memory context reset/delete callback mechanism.

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This allows cleanup actions to be registered to be called just before a
particular memory context's contents are flushed (either by deletion or
MemoryContextReset).  The patch in itself has no use-cases for this, but
several likely reasons for wanting this exist.

In passing, per discussion, rearrange some boolean fields in struct
MemoryContextData so as to avoid wasted padding space.  For safety,
this requires making allowInCritSection's existence unconditional;
but I think that's a better approach than what was there anyway.
This commit is contained in:
Tom Lane
2015-02-27 17:16:40 -05:00
parent 654809e770
commit f65e827058
3 changed files with 85 additions and 12 deletions
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src/include/utils/memutils.h
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@ -94,6 +94,8 @@ extern void MemoryContextDelete(MemoryContext context);
extern void MemoryContextResetChildren(MemoryContext context);
extern void MemoryContextDeleteChildren(MemoryContext context);
extern void MemoryContextResetAndDeleteChildren(MemoryContext context);
extern void MemoryContextRegisterResetCallback(MemoryContext context,
MemoryContextCallback *cb);
extern void MemoryContextSetParent(MemoryContext context,
MemoryContext new_parent);
extern Size GetMemoryChunkSpace(void *pointer);