refine of the GSOC project

[Charles Cui <charles.cui1984%gmail.com@localhost>]

Hi guys,

   I spend some time on researching the project and have some results.
Based on the results, I can split the project into multiple parts and expect
to complete the project in divide-and-concur way.

I found a lot of building errors in the posix benchmark are because of
compiler settings. Some variables are defined and never used, some
other variables are set and not used. In the makefile of the posix
benchmark, it used -Werror and -Wall as the flags, which will report
those cases as errors.
After disabling the flags, I can classify all remaining errors into
multiple classes, which are listed below. In each class, it requires
to provide a particular macro, function or some data structures. I
will continue to read related code base and find the best way to solve
all those problems. By the way, http://nxr.netbsd.org/ is super
helpful to view kernel code, thanks Christos for recommending.

timers:
   _SC_TIMER_MAX
   _SC_CPUTIME
   _SC_THREAD_CPUTIME
   _SC_DELAYTIMER_MAX

   CLOCK_PROCESS_CPUTIME_ID
   CLOCK_THREAD_CPUTIME_ID
   clock_getcpuclockid
   getdate
   strptime
   daylight
   timezone
   pthread_getcpuclockid
   struct timespec

pthreads:
   PTHREAD_PRIO_INHERIT
   PTHREAD_PRIO_NONE
   PTHREAD_PRIO_PROTECT
   PTHREAD_STACK_MIN
   PTHREAD_ONCE_INIT
   STACKSIZE
   pthread_barrierattr_getpshared
   pthread_barrierattr_setpshared
   pthread_mutexattr_setpshared
   pthread_mutexattr_getpshared
   pthread_condattr_setpshared
   pthread_condattr_getpshared
   pthread_condattr_setclock
   pthread_condattr_getclock
   pthread_mutexattr_getprioceiling
   pthread_mutexattr_setprioceiling
   pthread_mutexattr_getprotocol
   pthread_mutexattr_setprotocol
   pthread_rwlockattr_getpshared
   pthread_rwlockattr_setpshared
   pthread_mutex_getprioceiling
   pthread_mutex_timedlock
   pthread_setaffinity_np
   pthread_getattr_np

scheduler:
    SCHED_SPORADIC

signals:

    SIGPOLL
    SIGRTMIN
    SIGRTMAX
    SIGNAL
    SIGSTKSZ
    SIG_INVALID
    SIGTOTEST
    _SC_REALTIME_SIGNALS
    _SC_SIGQUEUE_MAX
    SA_ONSTACK
    SA_RESETHAND
    SA_RESTART
    SA_NODEFER
    SS_ONSTACK
    SS_DISABLE
    MINSIGSTKSZ
    struct sigstack
    stack_t
    bsd_signal
    killpg
    sigaltstack_test
    sigaltstack
    sighold
    sigignore
    siginterrupt
    sigpause
    sigrelse
    sigset

mmap:
    POSIX_TYPED_MEM_ALLOCATE
    POSIX_TYPED_MEM_ALLOCATE_CONTIG
    POSIX_TYPED_MEM_MAP_ALLOCATABLE
    struct posix_typed_mem_info
    posix_mem_offset
    posix_typed_mem_get_info
    posix_typed_mem_open

aio
    struct rlimit

cpuset
    CPU_ZERO
    CPU_SETSIZE
    CPU_SET
    cpu_set_t


semaphore
    _SC_SEM_NSEMS_MAX
    features.h