1  /* Copyright (C) 2005-2023 Free Software Foundation, Inc.
       2     Contributed by Richard Henderson <rth@redhat.com>.
       3  
       4     This file is part of the GNU Offloading and Multi Processing Library
       5     (libgomp).
       6  
       7     Libgomp is free software; you can redistribute it and/or modify it
       8     under the terms of the GNU General Public License as published by
       9     the Free Software Foundation; either version 3, or (at your option)
      10     any later version.
      11  
      12     Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
      13     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
      14     FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
      15     more details.
      16  
      17     Under Section 7 of GPL version 3, you are granted additional
      18     permissions described in the GCC Runtime Library Exception, version
      19     3.1, as published by the Free Software Foundation.
      20  
      21     You should have received a copy of the GNU General Public License and
      22     a copy of the GCC Runtime Library Exception along with this program;
      23     see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      24     <http://www.gnu.org/licenses/>.  */
      25  
      26  /* This file contains helpers for the ATOMIC construct.  */
      27  
      28  #include "libgomp.h"
      29  
      30  /* This mutex is used when atomic operations don't exist for the target
      31     in the mode requested.  The result is not globally atomic, but works so
      32     long as all parallel references are within #pragma omp atomic directives.
      33     According to responses received from omp@openmp.org, appears to be within
      34     spec.  Which makes sense, since that's how several other compilers
      35     handle this situation as well.  */
      36  
      37  static gomp_mutex_t atomic_lock;
      38  
      39  void
      40  GOMP_atomic_start (void)
      41  {
      42    gomp_mutex_lock (&atomic_lock);
      43  }
      44  
      45  void
      46  GOMP_atomic_end (void)
      47  {
      48    gomp_mutex_unlock (&atomic_lock);
      49  }
      50  
      51  #if !GOMP_MUTEX_INIT_0
      52  static void __attribute__((constructor))
      53  initialize_atomic (void)
      54  {
      55    gomp_mutex_init (&atomic_lock);
      56  }
      57  #endif