pthreads, cygwin and pthread_mutex_lock not blocking

[Peter Rehley <peter at rehley dot net>]

Hi,

I'm trying to use pthread in cygwin, and I'm expecting the function 
pthread_mutex_lock to block when used.  However it is returning error 
45 (EDEADLK).    I'm using a static initializer for the thread so the 
mutex is type PTHREAD_MUTEX_DEFAULT.
When I look through the pthread code I see that PTHREAD_MUTEX_DEFAULT 
is set to PTHREAD_MUTEX_ERRORCHECK,
When I do the same on linux or soloris, the pthread_mutex_lock blocks, 
and looking in the pthread.h file on those systems see that  the 
default is set to PTHREAD_MUTEX_NORMAL.

Why is cygwin using PTHREAD_MUTEX_ERRORCHECK as the default?  And what 
problems might occur if PTHREAD_MUTEX_DEFAULT is set to 
PTHREAD_MUTEX_NORMAL?

The reason why I'm asking is because the application that I'm working 
on needs to work on linux, soloris and cygwin, and keeping the code the 
same is important.

Thanks,
Peter

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