1/* Threads compatibility routines for libgcc2 and libobjc for
2   LynxOS.  */
3/* Compile this one with gcc.  */
4/* Copyright (C) 2004-2015 Free Software Foundation, Inc.
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 3, or (at your option) any later
11version.
12
13GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16for more details.
17
18Under Section 7 of GPL version 3, you are granted additional
19permissions described in the GCC Runtime Library Exception, version
203.1, as published by the Free Software Foundation.
21
22You should have received a copy of the GNU General Public License and
23a copy of the GCC Runtime Library Exception along with this program;
24see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
25<http://www.gnu.org/licenses/>.  */
26
27#ifndef GCC_GTHR_LYNX_H
28#define GCC_GTHR_LYNX_H
29
30#ifdef _MULTITHREADED
31
32/* Using the macro version of pthread_setspecific leads to a
33   compilation error.  Instead we have two choices either kill all
34   macros in pthread.h with defining _POSIX_THREADS_CALLS or undefine
35   individual macros where we should fall back on the function
36   implementation.  We choose the second approach.  */
37
38#include <pthread.h>
39#undef pthread_setspecific
40
41/* When using static libc on LynxOS, we cannot define pthread_create
42   weak.  If the multi-threaded application includes iostream.h,
43   gthr-posix.h is included and pthread_create will be defined weak.
44   If pthread_create is weak its defining module in libc is not
45   necessarily included in the link and the symbol is resolved to zero.
46   Therefore the first call to it will crash.
47
48   Since -mthreads is a multilib switch on LynxOS we know that at this
49   point we are compiling for multi-threaded.  Omitting the weak
50   definitions at this point should have no effect.  */
51
52#undef  GTHREAD_USE_WEAK
53#define GTHREAD_USE_WEAK 0
54
55#include "gthr-posix.h"
56
57#else
58#include "gthr-single.h"
59#endif
60
61#endif /* GCC_GTHR_LYNX_H */
62