rpm, pthreads, and XScale

[Eli Carter <eli carter inet com>]

All,

I'm still fighting with getting rpm to run on an ARM (XScale) system. 
If anyone has any clues, I'd love to hear them...

# rpm -qa
rpmdb: /var/lib/rpm/__db.001: unable to initialize environment lock: 
Function not implemented
error: db4 error(38) from dbenv->open: Function not implemented
error: cannot open Packages index using db3 - Function not implemented (38)
error: cannot open Packages database in /var/lib/rpm
no packages

"unable to initialize environment lock" appears to come from 
rpm/db/env/env_region.c due to a call to __db_mutex_init() failing with 
ENOSYS.  __db_mutex_init appears to be a macro for 
__db_pthread_mutex_init() which appears to be defined in 
db/mutex/mut_pthread.c.  __db_pthread_mutex_init() can return ENOSYS if 
pthread_mutexattr_setpshared() or pthread_condattr_setpshared() returns 
ENOSYS.
__pthread_mutexattr_setpshared() is a weak alias for 
pthread_mutexattr_setpshared() and can be found in 
glibc/linuxthreads/mutex.c where we find:
int __pthread_mutexattr_setpshared (pthread_mutexattr_t *attr, int pshared)
{
  if (pshared != PTHREAD_PROCESS_PRIVATE && pshared != 
PTHREAD_PROCESS_SHARED)
    return EINVAL;

  /* For now it is not possible to shared a conditional variable.  */
  if (pshared != PTHREAD_PROCESS_PRIVATE)
    return ENOSYS;

  return 0;
}

So, using PTHREAD_PROCESS_SHARED results in ENOSYS.  Looking back at 
__db_pthread_mutex_init() from db/mutex/mut_pthread.c, shows that rpm is 
using PTHREAD_PROCESS_SHARED.  This is the only function that uses 
..._SHARED.

For my ARM work, I'm looking at rpm 4.1 and glibc 2.3.1 and cross 
compiling with gcc 3.2.1+, but Fedora Core has the same code in these 
places and it works just fine.  How does the same code not generate 
errors on my x86 box?  The way I read the code, it should return ENOSYS.

I must be missing something.  But I can't see what, so at this point I'm 
prepared to believe it's something dumb.  Anybody got a spare clue for me?

TIA,

Eli
--------------------. "If it ain't broke now,
Eli Carter           \                  it will be soon." -- crypto-gram
eli.carter(a)inet.com `-------------------------------------------------




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