[Bug libstdc++/51906] thread lock test failures on darwin11 under Xcode 4.2

["howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906

--- Comment #30 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-01-31 02:25:31 UTC ---
(In reply to comment #29)
> It might be easier if I to get access to a darwin system, which I should have
> in a few days so I can test it myself.

Okay, I was able to get...

#include <pthread.h>
#include <stdio.h>

struct mutex {
   pthread_mutex_t m = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
};

int main()
{
  mutex m;
//  return pthread_mutex_trylock(&m.m);
  printf(" returned %d\n",pthread_mutex_trylock(&m.m));

}

to compile with "g++-fsf-4.7 -std=c++0x -g -O0 pthread_test.c" on darwin11 and
it outputs "22"
which appears to be...


       The pthread_mutex_lock() and  pthread_mutex_trylock()  functions  shall
       fail if:

       EINVAL The  mutex  was  created  with the protocol attribute having the
              value PTHREAD_PRIO_PROTECT and the calling thread's priority  is
              higher than the mutex's current priority ceiling.