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89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
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/* Copyright (C) 2002-2022 Free Software Foundation, Inc.
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Contributed by Zack Weinberg <zack@codesourcery.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Threads compatibility routines for libgcc2 for VxWorks.
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This file implements the init-once service exposed by gthr-vxworks.h. */
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#include "tconfig.h"
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#include "tsystem.h"
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#include "gthr.h"
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#if defined(__GTHREADS)
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#include <vxWorks.h>
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#include <taskLib.h>
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#ifndef __RTP__
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# include <vxLib.h>
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# include <taskHookLib.h>
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#else /* __RTP__ */
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# include <errno.h>
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#endif /* __RTP__ */
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/* ----------------------------- Init-once ------------------------------- */
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static void
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__release (__gthread_once_t ** __guard)
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{
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(*__guard)->busy = 0;
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}
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int
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__gthread_once (__gthread_once_t * __guard, void (*__func) (void))
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{
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if (__guard->done)
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return 0;
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/* Busy-wait until we have exclusive access to the state. Check if
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another thread managed to perform the init call in the interim. */
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while (!__TAS(&__guard->busy))
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{
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if (__guard->done)
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return 0;
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taskDelay (1);
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}
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if (!__guard->done)
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{
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#ifndef __USING_SJLJ_EXCEPTIONS__
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/* Setup a cleanup to release the guard when __func() throws an
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exception. We cannot use this with SJLJ exceptions as
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Unwind_Register calls __gthread_once, leading to an infinite
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recursion. */
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__attribute__ ((cleanup (__release)))
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__gthread_once_t *__temp = __guard;
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#endif
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__func ();
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__guard->done = 1;
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}
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__release(&__guard);
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return 0;
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}
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#endif /* __GTHREADS */
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