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From: "Werner Tuchan" <tuwn@gmx.net> To: rth@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: libstdc++/5198: 3.0.3 linux x m68k build fail: invalid opcodes in c++locale.cc Date: Tue, 05 Feb 2002 05:26:00 -0000 [thread overview] Message-ID: <20020205132603.27034.qmail@sources.redhat.com> (raw) The following reply was made to PR libstdc++/5198; it has been noted by GNATS. From: "Werner Tuchan" <tuwn@gmx.net> To: "Aaron J. Grier" <aaron@frye.com> Cc: <gcc-gnats@gcc.gnu.org>, <gcc-prs@gcc.gnu.org>, <gcc-bugs@gcc.gnu.org>, <aaron@frye.com>, <miod@openbsd.org>, <jj@openbsd.org>, <espie@openbsd.org> Subject: Re: libstdc++/5198: 3.0.3 linux x m68k build fail: invalid opcodes in c++locale.cc Date: Tue, 5 Feb 2002 14:24:57 +0100 > if we are turning off interrupts for the whole operation, and nobody > else can get into __exchange_and_add without turning off interrupts, > then why bother with the TAS at all? > > there's got to be an elegant solution somewhere. :) > TAS is only needed for multiprocessor spinlocks. A second processor could concurrently enter even with interrupts disabled. This is the only reason why TAS exists at all otherwise you could just use BSET. TAS is atomic even on MP machines. Yet it is pretty unlikely that you find any multiprocessor machines with these CPUs nowadays. -Werner
next reply other threads:[~2002-02-05 13:26 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-02-05 5:26 Werner Tuchan [this message] -- strict thread matches above, loose matches on Subject: below -- 2002-02-04 14:36 Aaron J. Grier 2002-02-04 11:06 Werner Tuchan 2002-01-23 17:41 rth 2002-01-08 13:56 Aaron J. Grier 2002-01-04 15:36 Aaron J. Grier 2002-01-04 14:46 Craig Rodrigues 2002-01-04 14:36 Aaron J. Grier 2002-01-04 14:26 Craig Rodrigues 2002-01-04 13:56 Don Lindsay 2002-01-04 12:56 Craig Rodrigues 2002-01-04 12:26 Don Lindsay 2002-01-03 20:46 Craig Rodrigues 2002-01-03 20:16 Don Lindsay 2002-01-03 16:12 rodrigc 2002-01-03 15:47 rodrigc 2001-12-26 16:56 Don Lindsay 2001-12-26 16:20 rodrigc 2001-12-26 14:36 lindsayd
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