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-rw-r--r--gcc/config/vxlib.c95
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diff --git a/gcc/config/vxlib.c b/gcc/config/vxlib.c
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--- a/gcc/config/vxlib.c
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-/* Copyright (C) 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
- Contributed by Zack Weinberg <zack@codesourcery.com>
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-for more details.
-
-Under Section 7 of GPL version 3, you are granted additional
-permissions described in the GCC Runtime Library Exception, version
-3.1, as published by the Free Software Foundation.
-
-You should have received a copy of the GNU General Public License and
-a copy of the GCC Runtime Library Exception along with this program;
-see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
-<http://www.gnu.org/licenses/>. */
-
-/* Threads compatibility routines for libgcc2 for VxWorks.
- These are out-of-line routines called from gthr-vxworks.h. */
-
-#include "tconfig.h"
-#include "tsystem.h"
-#include "gthr.h"
-
-#if defined(__GTHREADS)
-#include <vxWorks.h>
-#ifndef __RTP__
-#include <vxLib.h>
-#endif
-#include <taskLib.h>
-#ifndef __RTP__
-#include <taskHookLib.h>
-#else
-# include <errno.h>
-#endif
-
-/* Init-once operation.
-
- This would be a clone of the implementation from gthr-solaris.h,
- except that we have a bootstrap problem - the whole point of this
- exercise is to prevent double initialization, but if two threads
- are racing with each other, once->mutex is liable to be initialized
- by both. Then each thread will lock its own mutex, and proceed to
- call the initialization routine.
-
- So instead we use a bare atomic primitive (vxTas()) to handle
- mutual exclusion. Threads losing the race then busy-wait, calling
- taskDelay() to yield the processor, until the initialization is
- completed. Inefficient, but reliable. */
-
-int
-__gthread_once (__gthread_once_t *guard, void (*func)(void))
-{
- if (guard->done)
- return 0;
-
-#ifdef __RTP__
- __gthread_lock_library ();
-#else
- while (!vxTas ((void *)&guard->busy))
- {
-#ifdef __PPC__
- /* This can happen on powerpc, which is using all 32 bits
- of the gthread_once_t structure. */
- if (guard->done)
- return;
-#endif
- taskDelay (1);
- }
-#endif
-
- /* Only one thread at a time gets here. Check ->done again, then
- go ahead and call func() if no one has done it yet. */
- if (!guard->done)
- {
- func ();
- guard->done = 1;
- }
-
-#ifdef __RTP__
- __gthread_unlock_library ();
-#else
- guard->busy = 0;
-#endif
- return 0;
-}
-
-#endif /* __GTHREADS */