need ib_util_free to complement ib_util_malloc
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Key: CORE-3826
URL: http://tracker.firebirdsql.org/browse/CORE-3826
Project: Firebird Core
Issue Type: Improvement
Components: Engine
Affects Versions: 2.5.0
Environment: any
Reporter: Ray Holme
Priority: Minor
It is reasonable to allocate memory in a UDF and then abort the operation. It
would be better if the UDF code could free the allocated memory.
It is also possible to allocate multiple chunks of memory and only return one
to the caller.
While it is possible that the engine frees memory even if it is not used
(FREE_IT), it is also reasonable for the code to allocate multiple memory hunks
during the course of a function and only leave the last one to be free'd -
sometimes only one hunk but the UDF aborts and returns 0. In the case of a long
running transaction with lots of UDF calls per row, it is also possible to eat
all memory before the clever engine decides to free unused hunks by transaction
(assuming it does that as that is what I would do).
Instead, the coder must malloc the additional or conditional hunks (is this
handled by FREE-IT if using ib_util_malloc?) and cannot free anything malloc'd
by the ib CALL.
If it is a conditional chunk, then when it is decided to use it, an additional
call to ib_util_malloc is required and then a plain free would be used.
This is a double potential memory leak problem.
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