simple multithread program fails on Cygwin, succeeds on Linux

Mon Aug 10 12:32:00 GMT 2009

Bruno Haible wrote:
> Hi,
>> The attached test program for pthread_once uses the following basic POSIX
> threads functions:
> pthread_create
> pthread_join
> pthread_mutex_init
> pthread_mutex_lock
> pthread_mutex_unlock
> pthread_once
> pthread_rwlock_init
> pthread_rwlock_rdlock
> pthread_rwlock_unlock
> pthread_rwlock_wrlock

In Cygwin 1.5 there was a bug that meant that you could not lock a 
rwlock recursively for read (it would just deadlock on the second 
acquire). I didn't study the code for very long, but this might be the 
problem you're encountering. In any case, Cygwin 1.7 fixes at least one 
problem with rwlocks so it's a good upgrade choice.
Cheers,
Nicholas Sherlock
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