Re: the remaining chunk of the RTEMS patch

["J. Johnston" <jjohnstn at cygnus dot com>]

Joel Sherrill wrote:
> 
> I have trimmed this patch down to 700 lines.  I know it is still
> a bit large but it tends to boil down to a handful of interrelated
> things that I am having trouble separating further.  I have made
> every effort to make sure things were enabled only for RTEMS
> or based on POSIX feature flags which are currently only
> set for RTEMS.
> 
>   + RTEMS supports a fairly full set of POSIX 1003.1b including
>     threads, mutexes, condition variables, and keys.  The core of
>     this weaves through the .h files.  So you have the addition
>     of pthread.h and sys/sched.h.  pthread.h being in newlib makes
>     that file available language run-times are built in one-tree style.
>   + sys/features.h is a centralized place to set all those POSIX
>     feature flags.  They were formerly in unistd.h.  As the set
>     defined by newlib targets grows, this file becomes VERY large.
>   + Signal stuff is augmented to include real-time signals.
>   + POSIX clocks and timers are added.
>   + unistd.h has two changes.  One is to make read, write, and
>     sbrk follow POSIX.  I only made read/write do this for RTEMS
>     because I was scared of the ramifications.  The other is
>     removing feature flags.
> 
> New files are attached.  Feel free to change the header to make
> them BSD-ish licensing.  I did not know which was the accepted
> statement to copy.
> 
>   + libc/include/pthread.h
>   + libc/include/sys/sched.h
>   + libc/include/sys/features.h
> 
> If all these patches are merged, then RTEMS does not need
> as many target specific files.  This means the following
> can be removed:
> 
>  + newlib/libc/sys/rtems/include/signal.h
>   + newlib/libc/sys/rtems/include/time.h
>   + newlib/libc/sys/rtems/sys/features.h
>   + newlib/libc/sys/rtems/sys/sched.h
>   + newlib/libc/sys/rtems/sys/siginfo.h
>   + newlib/libc/sys/rtems/sys/signal.h
>   + newlib/libc/sys/rtems/sys/time.h
>   + newlib/libc/sys/rtems/sys/times.h
> 
> The changelog...
> 
> 2000-12-01      Joel Sherrill <joel@OARcorp.com>
> 
>         * Merge RTEMS specific .h files into main libc/include.
>         * libc/sys/rtems/include/signal.h: Removed.
>         * libc/sys/rtems/include/time.h: Removed.
>         * libc/sys/rtems/sys/features.h: Removed.
>         * libc/sys/rtems/sys/sched.h: Removed.
>         * libc/sys/rtems/sys/siginfo.h: Removed.
>         * libc/sys/rtems/sys/signal.h: Removed.
>         * libc/sys/rtems/sys/time.h: Removed.
>         * libc/sys/rtems/sys/times.h: Removed.
>         * libc/include/pthread.h: New file.
>         * libc/include/sys/sched.h: New file.
>         * libc/include/sys/features.h: New file.
>         * libc/include/time.h: Removed duplicate definition of clock_t
>         and time_t, get them from <sys/types.h> instead.  Add prototypes
>         for POSIX clock and timer functionality.
>         * libc/include/machine/types.h: Add _CLOCKID_T_ and _TIMER_T_.
>         * libc/include/sys/signal.h: Add more complete set of POSIX
>         signal functionality including real-time and threaded signals.
>         * libc/include/sys/types.h: Add clock_t, time_t, struct
> timespec,
>         and struct itimerspec.  Centralizing these makes things cleaner.
>         * libc/include/sys/types.h: RTEMS uses 64-bit dev_t.
>         * libc/include/sys/types.h: Added numerous primitive definitions
>         for pthreads including macros, pthread_attr_t,
> pthread_mutexattr_t,
>         pthread_condattr_t, pthread_key_t, pthread_once_t, and
> pthread_t.
>         * libc/include/sys/unistd.h: Added getlogin_r() prototype.
>         * libc/include/sys/unistd.h: If RTEMS follow POSIX on read() and
>         write() prototype.
>         * libc/include/sys/unistd.h: sbrk() argument is ptrdiff_t by
> POSIX.
>         * libc/include/sys/unistd.h: Feature flags removed and moved
>         to new file <sys/features.h>.
>         * libc/include/sys/unistd.h: Full set of POSIX sysconf()
> constants
> 

Patch checked in.  An additional change was required to libc/sys/linux/sys/types.h because of
the movement of the time_t and clock_t definitions into <sys/types.h>.  The sbrk
change had to protected by #if defined(__rtems__) because there are prototype conflicts elsewhere
in newlib and in libgloss.

-- Jeff J.