Description:
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Using the php_interbase.dll extension causes Firebird instability (Crashes, Deadlocks, and BUGCHECKs).

I tried Firebird 1.5.2, Firbeird 1.5.3 and Firebird 2.0 RC1
I tried PHP 5.1.2, PHP 5.0.5

It happens most often while PHP is running as an Apache2 module.  It happens less often, but still happens, when
PHP is running as a CGI under Apache2

I believe it is a thread-safety issue in the 
php_interbase.dll or in the gds32.dll that comes with PHP.

I tried using the GDS32.dll from Firebird, and it has similar
problems.

I know that this is a problem either with php_interbase.dll
or with gds32.dll because when I use ODBC to connect to
firebird everything works great.


Reproduce code:
---------------
The database has to be under heavy load to reproduce this.

I have 50-200 simultaneous connections to the database with
a combination of read-only and write transactions and a lot
data going back and forth.

Expected result:
----------------
I expect the native access method to firebird to be stable.

Actual result:
--------------
I get BUGCHEKs, CRASHES, and unexplained DEADLOCKS.

FB2.0 RC1:
PDD-STANK (Server)	Wed May 03 21:04:29 2006
	Database: C:\DB.FDB
	internal gds software consistency check (invalid SEND request (167), file: exe.cpp line: 494)

FB 1.5.3:
PDD-STANK (Server)	Tue Apr 18 16:46:58 2006
	Database: C:\DB.FDB
	internal gds software consistency check (invalid SEND request (167))

PDD-STANK (Client)	Tue Apr 18 18:13:03 2006
	C:\Firebird\bin\fbserver.exe: terminated abnormally (4294967295)