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Other ecpg thread unsafety

From: ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>
To: Michael Meskes <meskes(at)postgresql(dot)org>, pgsql-hackers(at)postgresql(dot)org
Subject: Other ecpg thread unsafety
Date: 2007-09-26 08:56:59
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Lists: pgsql-hackers
I looked for another thread-unsafe usage of variables like prep_stmts,
and I found the 4 possibly-unsafe ones:

  [1] all_descriptors in ecpg/ecpglib/descriptor.c:
      Management of descriptors used by SQL DESCRIPTOR is not safe.

  [2] auto_allocs in ecpg/ecpglib/memory.c:
      All memory allocation for statements are not safe.

  [3] nextStmtID in ecpg/ecpglib/prepare.c:
      Increment is not safe in ECPGauto_prepare().

  [4] stmtCacheEntries in ecpg/ecpglib/prepare.c:
      Reading/writing are not safe in ECPGauto_prepare().

I'm not convinced that all of the above are completely dangerous,
but [2] might affect all of users writing multi-threaded ecpg programs...
Are there any bugs we should fix?

ITAGAKI Takahiro
NTT Open Source Software Center


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