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problems with pthread_mutex_lock()

I'm working on an C++ application and I'm at the stage when I have to choose
threads API. Since I want my program to be cross-platform (at least linux
and windows) I've decided to use pthreads. Besides I've already used
pthreads on linux a bit so I'm more or less familiar with them. I've chosen
pthreads-win32 as an pthreads implementation on windows. Unfortunately first
call to pthread_mutex_lock() bails out my program (mutex is initilized). At
the bottom of this post there is a link to the sources of my application so
from now on I'll be referering to source file and line. Failing
pthread_mutex_lock() call is at the seeker.cpp:101. I don't yet make any
other than mutex initilize/lock/unlock pthreads calls. In particular I don't
create any threads. Strange thing is that when lock/unlock call is placed
somewhere else in the code (seeker.cpp:45) everything works alright.  I've
tried using all flavours of pthreadV*.dll-s without success. When running in
debug mode after entering pthread_mutex_lock() call it bails out saying:
unhandled exception in skr.exe (KERNEL32.DLL): 0xC0000005: Access Violation.
I've to mention that the same code compiled on linux with linux pthreads
runs there just fine. On windows I've been using VC++6 with SP5. What am I
doing wrong? Can anybody please help me? Thank you in advance.

My program sources:
Just in case: as of yet there is no output on console. All of the output is
written to scanner01.dbg/scanner01.log files

best regards,

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