Description of problem:
rpmsq.c uses mutexs to manage the child processes.  These mutexes are defined
using default parameters.  RPM expects that PTHREAD_MUTEX_DEFAULT will have the
effects of PTHREAD_MUTEX_NORMAL.  POSIX 1003.1-2004 states that
PTHREAD_MUTEX_DEFAULT may be set to any standard POSIX mutex type, not
necessarily NORMAL.  This can lead to many unexpected problems, especially when
porting RPM to new OSes.

Version-Release number of selected component (if applicable):
4.3+

Additional info:

My suggestion is to add a simple:

#if PTHREAD_MUTEX_DEFAULT != PTHREAD_MUTEX_NORMAL
  #error RPM Expected PTHREAD_MUTEX_DEFAULT == PTHREAD_MUTEX_NORMAL
#endif

to the rpmio/rpmsq.c to help prevent future porting issues.. or if the defaults
ever change in an existing port.