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1 /* Threads compatibility routines for libgcc2 and libobjc for
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2 LynxOS. */
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3 /* Compile this one with gcc. */
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4 /* Copyright (C) 2004, 2008, 2009 Free Software Foundation, Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 Under Section 7 of GPL version 3, you are granted additional
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19 permissions described in the GCC Runtime Library Exception, version
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20 3.1, as published by the Free Software Foundation.
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21
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22 You should have received a copy of the GNU General Public License and
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23 a copy of the GCC Runtime Library Exception along with this program;
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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25 <http://www.gnu.org/licenses/>. */
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26
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27 #ifndef GCC_GTHR_LYNX_H
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28 #define GCC_GTHR_LYNX_H
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29
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30 #ifdef _MULTITHREADED
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31
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32 /* Using the macro version of pthread_setspecific leads to a
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33 compilation error. Instead we have two choices either kill all
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34 macros in pthread.h with defining _POSIX_THREADS_CALLS or undefine
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35 individual macros where we should fall back on the function
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36 implementation. We choose the second approach. */
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37
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38 #include <pthread.h>
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39 #undef pthread_setspecific
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40
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41 /* When using static libc on LynxOS, we cannot define pthread_create
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42 weak. If the multi-threaded application includes iostream.h,
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43 gthr-posix.h is included and pthread_create will be defined weak.
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44 If pthread_create is weak its defining module in libc is not
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45 necessarily included in the link and the symbol is resolved to zero.
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46 Therefore the first call to it will crash.
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47
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48 Since -mthreads is a multilib switch on LynxOS we know that at this
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49 point we are compiling for multi-threaded. Omitting the weak
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50 definitions at this point should have no effect. */
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51
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52 #undef GTHREAD_USE_WEAK
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53 #define GTHREAD_USE_WEAK 0
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54
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55 #include "gthr-posix.h"
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56
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57 #else
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58 #include "gthr-single.h"
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59 #endif
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60
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61 #endif /* GCC_GTHR_LYNX_H */
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