[MinGW-notify] [ mingw-Bugs-3420424 ] MemoryBarrier macro

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Bugs item #3420424, was opened at 2011-10-07 13:09
Message generated for change (Comment added) made by bwanamarko
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Category: w32api
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Earnie Boyd (earnie)
Assigned to: Chris Sutcliffe (ir0nh34d)
Summary: MemoryBarrier macro

Initial Comment:
http://msdn.microsoft.com/en-us/library/ms684208(VS.85).aspx

Just documenting we need to get this added to winnt.h for WINVER >= 0x0502

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Comment By: Mark Mikofski (bwanamarko)
Date: 2012-06-26 08:46

Message:
Any news on MemoryBarrier()?

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Comment By: Earnie Boyd (earnie)
Date: 2012-06-26 04:34

Message:
<quote>In fact, unfortunately, it appears as if freedesktop.org is not
going to
support mingw32 anymore, and they are switching to mingw-w64.</quote>

They are free to do so however, mingw-w64 contains some code from Wine and
is therefore encumbered with GPL/LGPL copyleft.  This causes 1) proprietary
software issues 2) the inability to modify the license of you own project
even if it is GPL.

<quote>Any plans to merge or reunite mingw32 and mingw-w64?</quote>

No, that is a dead issue.  However, we will eventually get around to having
our own 64 bit builds.

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Comment By: Mark Mikofski (bwanamarko)
Date: 2012-06-25 10:39

Message:
In fact, unfortunately, it appears as if freedesktop.org is not going to
support mingw32 anymore, and they are switching to mingw-w64. The following
bug status is listed as WONTFIX!
https://bugs.freedesktop.org/show_bug.cgi?id=41423 - dbus Bugzilla Bug
41423 - MemoryBarrier only available on Vista+
Any plans to merge or reunite mingw32 and mingw-w64?

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Comment By: Mark Mikofski (bwanamarko)
Date: 2012-06-25 09:45

Message:
Hi -- thanks for mingw! It is an indispensible tool for windows! Please
consider bumping this issue. freedesktop.org dbus also uses the
MemoryBarrier macro, so trying to compile without adding patch below will
fail with mingw in current form (2012-06-25). The current mindset on
mailing lists is that the patch should be applied to mingw (not dbus).
Thanks! --Mark

possible patch supplied by Mark Brand/Brad Pitcher for windows.h (or ?)
__CRT_INLINE VOID MemoryBarrier(VOID)
+{
+  LONG Barrier = 0;
+  __asm__ __volatile__("xchgl %%eax,%0 "
+    :"=r" (Barrier));
+}

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=3420424&group_id=2435