mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-11-27 22:03:57 +08:00
89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/* Copyright (C) 2002-2024 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.
|
|
|
|
This file implements the init-once service exposed by gthr-vxworks.h. */
|
|
|
|
#include "tconfig.h"
|
|
#include "tsystem.h"
|
|
#include "gthr.h"
|
|
|
|
#if defined(__GTHREADS)
|
|
|
|
#include <vxWorks.h>
|
|
#include <taskLib.h>
|
|
|
|
#ifndef __RTP__
|
|
# include <vxLib.h>
|
|
# include <taskHookLib.h>
|
|
#else /* __RTP__ */
|
|
# include <errno.h>
|
|
#endif /* __RTP__ */
|
|
|
|
/* ----------------------------- Init-once ------------------------------- */
|
|
|
|
static void
|
|
__release (__gthread_once_t ** __guard)
|
|
{
|
|
(*__guard)->busy = 0;
|
|
}
|
|
|
|
int
|
|
__gthread_once (__gthread_once_t * __guard, void (*__func) (void))
|
|
{
|
|
if (__guard->done)
|
|
return 0;
|
|
|
|
/* Busy-wait until we have exclusive access to the state. Check if
|
|
another thread managed to perform the init call in the interim. */
|
|
|
|
while (!__TAS(&__guard->busy))
|
|
{
|
|
if (__guard->done)
|
|
return 0;
|
|
taskDelay (1);
|
|
}
|
|
|
|
if (!__guard->done)
|
|
{
|
|
#ifndef __USING_SJLJ_EXCEPTIONS__
|
|
/* Setup a cleanup to release the guard when __func() throws an
|
|
exception. We cannot use this with SJLJ exceptions as
|
|
Unwind_Register calls __gthread_once, leading to an infinite
|
|
recursion. */
|
|
__attribute__ ((cleanup (__release)))
|
|
__gthread_once_t *__temp = __guard;
|
|
#endif
|
|
|
|
__func ();
|
|
__guard->done = 1;
|
|
}
|
|
|
|
__release(&__guard);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __GTHREADS */
|