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Date: Thu, 17 Feb 2011 21:34:18 -0800
Message-ID: <AANLkTinz4cgZPfbm5K7Nca7e=MjHumcg3g+Nx-LGY41A@mail.gmail.com>
From: Paul Lalonde <paul.a.lalonde@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] Modern development language for Plan 9,
 WAS: Re: RESOLVED: recoving important header file rudely
Topicbox-Message-UUID: b0168250-ead6-11e9-9d60-3106f5b1d025

Best recent c99 example:
int foo[] =3D {
  [0] =3D 1,
  [1] =3D 2,
  [2] =3D 4,
  [3] =3D 8,
  [4] =3D 16,
  [5] =3D 32
};

I shudder to think about foo[6].

Paul

On Thursday, February 17, 2011, ron minnich <rminnich@gmail.com> wrote:
> I was looking at another fine example of modern programming from glibc
> and just had to share it.
>
> Where does the getpid happen? It's anyone's guess. This is just so
> readable too ... I'm glad they want to such effort to optimize getpid.
>
> ron
>
> #ifndef NOT_IN_libc
> static inline __attribute__((always_inline)) pid_t really_getpid (pid_t o=
ldval);
>
> static inline __attribute__((always_inline)) pid_t
> really_getpid (pid_t oldval)
> {
>  =A0if (__builtin_expect (oldval =3D=3D 0, 1))
>  =A0 =A0{
>  =A0 =A0 =A0pid_t selftid =3D THREAD_GETMEM (THREAD_SELF, tid);
>  =A0 =A0 =A0if (__builtin_expect (selftid !=3D 0, 1))
>  =A0 =A0 =A0 =A0return selftid;
>  =A0 =A0}
>
>  =A0INTERNAL_SYSCALL_DECL (err);
>  =A0pid_t result =3D INTERNAL_SYSCALL (getpid, err, 0);
>
>  =A0/* We do not set the PID field in the TID here since we might be
>  =A0 =A0 called from a signal handler while the thread executes fork. =A0=
*/
>  =A0if (oldval =3D=3D 0)
>  =A0 =A0THREAD_SETMEM (THREAD_SELF, tid, result);
>  =A0return result;
> }
> #endif
>
> pid_t
> __getpid (void)
> {
> #ifdef NOT_IN_libc
>  =A0INTERNAL_SYSCALL_DECL (err);
>  =A0pid_t result =3D INTERNAL_SYSCALL (getpid, err, 0);
> #else
>  =A0pid_t result =3D THREAD_GETMEM (THREAD_SELF, pid);
>  =A0if (__builtin_expect (result <=3D 0, 0))
>  =A0 =A0result =3D really_getpid (result);
> #endif
>  =A0return result;
> }
>
> libc_hidden_def (__getpid)
> weak_alias (__getpid, getpid)
> libc_hidden_def (getpid)
>
>

--=20
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