Pro*C with Visual C++ - leaks memory with EXEC SQL CONTEXT FREE

Hello,
I am making an aplication with threads, using Visual C++ with Pro*C... and I have a problem when the aplication execute EXEC SQL CONTEXT FREE the memory reserved is not free.
this is my code:
#include <sqlca.h>
EXEC SQL BEGIN DECLARE SECTION;
sql_context ctx;
EXEC SQL END DECLARE SECTION;
EXEC SQL ENABLE THREADS;
EXEC SQL CONTEXT ALLOCATE :ctx;
EXEC SQL CONTEXT USE :ctx;
EXEC SQL COMMIT WORK RELEASE;
EXEC SQL CONTEXT FREE :ctx;
thanks in advance

Hi!
I suppose to helping in solve your question is necessary see how your application is working with threads.
Can you print them also?

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