Mercurial > hg > CbC > CbC_gcc

comparison libgcc/config/gthr-vxworks.c @ 145:1830386684a0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
parents
children
comparison
equal deleted inserted replaced
131:84e7813d76e9 145:1830386684a0
1 /* Copyright (C) 2002-2020 Free Software Foundation, Inc.
2 Contributed by Zack Weinberg <zack@codesourcery.com>
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25 /* Threads compatibility routines for libgcc2 for VxWorks.
26
27 This file implements the init-once service exposed by gthr-vxworks.h. */
28
29 #include "tconfig.h"
30 #include "tsystem.h"
31 #include "gthr.h"
32
33 #if defined(__GTHREADS)
34
35 #include <vxWorks.h>
36
37 #ifndef __RTP__
38 # include <vxLib.h>
39 # include <taskHookLib.h>
40 #else /* __RTP__ */
41 # include <errno.h>
42 #endif /* __RTP__ */
43
44 /* ----------------------------- Init-once ------------------------------- */
45
46 static void
47 __release (__gthread_once_t ** __guard)
48 {
49 (*__guard)->busy = 0;
50 }
51
52 int
53 __gthread_once (__gthread_once_t * __guard, void (*__func) (void))
54 {
55 if (__guard->done)
56 return 0;
57
58 /* Busy-wait until we have exclusive access to the state. Check if
59 another thread managed to perform the init call in the interim. */
60
61 while (!__TAS(&__guard->busy))
62 {
63 if (__guard->done)
64 return 0;
65 taskDelay (1);
66 }
67
68 if (!__guard->done)
69 {
70 #ifndef __USING_SJLJ_EXCEPTIONS__
71 /* Setup a cleanup to release the guard when __func() throws an
72 exception. We cannot use this with SJLJ exceptions as
73 Unwind_Register calls __gthread_once, leading to an infinite
74 recursion. */
75 __attribute__ ((cleanup (__release)))
76 __gthread_once_t *__temp = __guard;
77 #endif
78
79 __func ();
80 __guard->done = 1;
81 }
82
83 __release(&__guard);
84 return 0;
85 }
86
87 #endif /* __GTHREADS */