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Cleanup for pull-up-isReset patch.

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Clear isReset before, not after, calling the context-specific alloc method,
so as to preserve the option to do a tail call in MemoryContextAlloc
(and also so this code isn't assuming that a failed alloc call won't have
changed the context's state before failing).  Fix missed direct invocation
of reset method.  Reformat a comment.
This commit is contained in:
Tom Lane 2011-05-24 17:56:52 -04:00
parent 11c08c3fd7
commit b23aeb6519
2 changed files with 12 additions and 11 deletions
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10
src/backend/utils/mmgr/aset.c
View File

@ -128,11 +128,11 @@ typedef void *AllocPointer;
/* /*
* AllocSetContext is our standard implementation of MemoryContext. * AllocSetContext is our standard implementation of MemoryContext.
* *
* Note: header.isReset means there is nothing for AllocSetReset to do. This is * Note: header.isReset means there is nothing for AllocSetReset to do.
* different from the aset being physically empty (empty blocks list) because * This is different from the aset being physically empty (empty blocks list)
* we may still have a keeper block. It's also different from the set being * because we may still have a keeper block. It's also different from the set
* logically empty, because we don't attempt to detect pfree'ing the last * being logically empty, because we don't attempt to detect pfree'ing the
* active chunk. * last active chunk.
*/ */
typedef struct AllocSetContext typedef struct AllocSetContext
{ {

13
src/backend/utils/mmgr/mcxt.c
View File

@ -234,7 +234,7 @@ MemoryContextResetAndDeleteChildren(MemoryContext context)
AssertArg(MemoryContextIsValid(context)); AssertArg(MemoryContextIsValid(context));
MemoryContextDeleteChildren(context); MemoryContextDeleteChildren(context);
(*context->methods->reset) (context); MemoryContextReset(context);
} }
/* /*
@ -510,16 +510,15 @@ MemoryContextCreate(NodeTag tag, Size size,
void * void *
MemoryContextAlloc(MemoryContext context, Size size) MemoryContextAlloc(MemoryContext context, Size size)
{ {
void *ret;
AssertArg(MemoryContextIsValid(context)); AssertArg(MemoryContextIsValid(context));
if (!AllocSizeIsValid(size)) if (!AllocSizeIsValid(size))
elog(ERROR, "invalid memory alloc request size %lu", elog(ERROR, "invalid memory alloc request size %lu",
(unsigned long) size); (unsigned long) size);
ret = (*context->methods->alloc) (context, size);
context->isReset = false; context->isReset = false;
return ret;
return (*context->methods->alloc) (context, size);
} }
/* /*
@ -540,11 +539,12 @@ MemoryContextAllocZero(MemoryContext context, Size size)
elog(ERROR, "invalid memory alloc request size %lu", elog(ERROR, "invalid memory alloc request size %lu",
(unsigned long) size); (unsigned long) size);
context->isReset = false;
ret = (*context->methods->alloc) (context, size); ret = (*context->methods->alloc) (context, size);
MemSetAligned(ret, 0, size); MemSetAligned(ret, 0, size);
context->isReset = false;
return ret; return ret;
} }
@ -566,11 +566,12 @@ MemoryContextAllocZeroAligned(MemoryContext context, Size size)
elog(ERROR, "invalid memory alloc request size %lu", elog(ERROR, "invalid memory alloc request size %lu",
(unsigned long) size); (unsigned long) size);
context->isReset = false;
ret = (*context->methods->alloc) (context, size); ret = (*context->methods->alloc) (context, size);
MemSetLoop(ret, 0, size); MemSetLoop(ret, 0, size);
context->isReset = false;
return ret; return ret;
} }