VC++ 2005 beta1 fails with pthreads benchmark tests

When the POSIX pthreads library for w32 release 2-2-0
(http://sources.redhat.com/pthreads-win32/) is compiled with VC++6
then it compiles and passes all the benchmark tests in the subdirectory "tests".
Also, VC++ 2005 beta 1 compiles the tests fine, but here the following
tests fail in execution:

# semaphore1.pass \
# condvar2.pass \
# condvar2_1.pass \
# mutex8.pass \
# mutex8n.pass \
# mutex8e.pass \
# mutex8r.pass \
# condvar3.pass \
# condvar3_1.pass \
# condvar3_2.pass \
# condvar3_3.pass \
# condvar4.pass \
# condvar5.pass \
# condvar6.pass \
# condvar7.pass \
# condvar8.pass \
# condvar9.pass \
# rwlock7.pass \
# rwlock8.pass \
# rwlock2_t.pass \
# rwlock3_t.pass \
# rwlock4_t.pass \
# rwlock5_t.pass \
# rwlock6_t.pass \
# rwlock6_t2.pass \
# spin4.pass \

Why are there such differences in execution of the generated code
between VC++6 and VC++2005 ? Is this due to bugs in the beta1,
or is this the result of general differences between the two products?
Are there any compiler/linker switches for backwards "compatibility" to VC++6?


.

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