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Re: pg_malloc() versus malloc(0)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: pg_malloc() versus malloc(0)
Date: 2012-10-01 14:45:38
Message-ID: 24153.1349102738@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
>> Namely, that on platforms where malloc(0) returns NULL instead of
>> a pointer to a zero-size block, pg_malloc thinks it's a failure
>> and aborts the program.

> What's the use case for malloc(0) anyway?

See getAggregates() for an example.  Yeah, we could add a special-case
code path for no aggregates, but it would be annoying and error-prone.

			regards, tom lane


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