1  /* Threads compatibility routines for libgcc2 and libobjc for
       2     LynxOS.  */
       3  /* Compile this one with gcc.  */
       4  /* Copyright (C) 2004-2023 Free Software Foundation, Inc.
       5  
       6  This file is part of GCC.
       7  
       8  GCC is free software; you can redistribute it and/or modify it under
       9  the terms of the GNU General Public License as published by the Free
      10  Software Foundation; either version 3, or (at your option) any later
      11  version.
      12  
      13  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      14  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      15  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      16  for more details.
      17  
      18  Under Section 7 of GPL version 3, you are granted additional
      19  permissions described in the GCC Runtime Library Exception, version
      20  3.1, as published by the Free Software Foundation.
      21  
      22  You should have received a copy of the GNU General Public License and
      23  a copy of the GCC Runtime Library Exception along with this program;
      24  see 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 */