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From:	"Gary R. Van Sickle" <g DOT r DOT vansickle AT worldnet DOT att DOT net>
To:	<cygwin-developers AT cygwin DOT com>
Subject:	RE: quandary with pthreads
Date:	Thu, 12 Dec 2002 01:37:37 -0600
Message-ID:	<NCBBIHCHBLCMLBLOBONKKEHDDJAA.g.r.vansickle@worldnet.att.net>
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Ok, attached is what I'd try if I was set up to try it.  I've found that you
pretty much always need the "volatile" after the __asm__, or the newer gccs want
to optimize your assembly away, even if they should be able to tell that you've
got side-effects.

--
Gary R. Van Sickle
Brewer.  Patriot.

> -----Original Message-----
> From: cygwin-developers-owner AT cygwin DOT com
> [mailto:cygwin-developers-owner AT cygwin DOT com]On Behalf Of Christopher
> Faylor
> Sent: Thursday, December 12, 2002 12:03 AM
> To: cygwin-developers AT cygwin DOT com
> Subject: Re: quandary with pthreads
>
>
> On Wed, Dec 11, 2002 at 11:53:03PM -0600, Gary R. Van Sickle wrote:
> >>I have created assembler versions for the Interlocked functions that
> >>work fine unless they are made inline (see attachment).  Maybe someone
> >>with a better understanding of gcc inline assembler might have a look
> >>at it).
> >
> >I may have the painfully-acquired honor of fitting that description.
> >How were you trying to inline them?  Essentially as-is?  If so, I just
> >may be able to help.
>
> The routines in question are in winbase.h.  I took inspiration for most
> of them from linux.
>
> cgf

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	name="winbase.h"
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	filename="winbase.h"

#include_next "winbase.h"=0A=
=0A=
#ifdef EXPCGF=0A=
#define DECLARE_TLS_STORAGE char **tls[4096] __attribute__ ((unused))=0A=
#else=0A=
#define DECLARE_TLS_STORAGE do {} while (0)=0A=
#define _WINBASE2_H=0A=
#endif=0A=
=0A=
#if defined(__INSIDE_CYGWIN__) && !defined (__NO_INTERLOCKED__)=0A=
=0A=
#ifndef __INTERLOCKED_DEFINED__=0A=
#define __INTERLOCKED_DEFINED__=0A=
=0A=
#ifdef __cplusplus=0A=
extern "C" {=0A=
#endif=0A=
=0A=
extern __inline__ long ilockincr (long *m)=0A=
{=0A=
  int __res;=0A=
  __asm__ volatile ("\n\=0A=
    movl $1,%0\n\=0A=
    lock xadd %0,(%1)\n\=0A=
    inc  %0\n"=0A=
    : "=3Da" (__res), "=3Dq" (m)=0A=
    : "1" (m)=0A=
    : "memory" );=0A=
  return __res;=0A=
}=0A=
=0A=
extern __inline__ long ilockdecr (long *m)=0A=
{=0A=
  int __res;=0A=
  __asm__ volatile ("\n\=0A=
    movl $0xffffffff,%0\n\=0A=
    lock xadd %0,(%1)\n\=0A=
    dec  %0\n"=0A=
    : "=3Da" (__res), "=3Dq" (m)=0A=
    : "1" (m)=0A=
    : "memory" );=0A=
  return __res;=0A=
}=0A=
=0A=
extern __inline__ long ilockexch (long *t, long v)=0A=
{=0A=
  int __res;=0A=
  __asm__ volatile ("\n\=0A=
1:  lock cmpxchgl %3,(%1)\n\=0A=
    jne 1b\n"=0A=
    : "=3Da" (__res), "=3Dq" (t)=0A=
    : "1" (t), "q" (v), "0" (*t)=0A=
    : "memory" );=0A=
  return __res;=0A=
}=0A=
=0A=
extern __inline__ long ilockcmpexch (long *t, long v, long c)=0A=
{=0A=
  int __res;=0A=
  __asm__ volatile ("\n\=0A=
    lock cmpxchgl %3,(%1)\n"=0A=
    : "=3Da" (__res), "=3Dq" (t)=0A=
    : "1" (t), "q" (v), "0" (c)=0A=
    : "memory" );=0A=
  return __res;=0A=
}=0A=
=0A=
#ifdef __cplusplus=0A=
}=0A=
#endif=0A=
=0A=
#undef InterlockedIncrement=0A=
#define InterlockedIncrement ilockincr=0A=
#undef InterlockedDecrement=0A=
#define InterlockedDecrement ilockdecr=0A=
#undef InterlockedExchange=0A=
#define InterlockedExchange ilockexch=0A=
#undef InterlockedCompareExchange=0A=
#define InterlockedCompareExchange ilockcmpexch=0A=
=0A=
#endif /*__INTERLOCKED_DEFINED__*/=0A=
=0A=
#endif /*defined(__INSIDE_CYGWIN__) && !defined (__NO_INTERLOCKED__)*/=0A=
=0A=
#ifndef _WINBASE2_H=0A=
#define _WINBASE2_H=0A=
=0A=
extern long tls_ix;=0A=
extern char * volatile *__stackbase __asm__ ("%fs:4");=0A=
=0A=
extern __inline__ DWORD=0A=
my_tlsalloc ()=0A=
{=0A=
  DWORD n =3D ilockdecr (&tls_ix);=0A=
  __stackbase[tls_ix] =3D NULL;=0A=
  return n;=0A=
}=0A=
=0A=
extern __inline__ BOOL=0A=
my_tlssetvalue (DWORD ix, void *val)=0A=
{=0A=
  __stackbase[ix] =3D (char *) val;=0A=
  return 1;=0A=
}=0A=
=0A=
extern __inline__ void *=0A=
my_tlsgetvalue (DWORD ix)=0A=
{=0A=
  return __stackbase[ix];=0A=
}=0A=
=0A=
extern __inline__ BOOL=0A=
my_tlsfree (DWORD ix)=0A=
{=0A=
  /* nothing for now */=0A=
  return 1;=0A=
}=0A=
=0A=
#undef TlsAlloc=0A=
#define TlsAlloc my_tlsalloc=0A=
#undef TlsGetValue=0A=
#define TlsGetValue my_tlsgetvalue=0A=
#undef TlsSetValue=0A=
#define TlsSetValue my_tlssetvalue=0A=
#undef TlsFree=0A=
#define TlsFree my_tlsfree=0A=
#endif /*_WINBASE2_H*/=0A=

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