text: /* Copyright (C) 2008-2020 Free Software Foundation, Inc.
     Contributed by Jakub Jelinek <jakub@redhat.com>.
  
     This file is part of the GNU Offloading and Multi Processing Library
     (libgomp).
  
     Libgomp is free software; you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3, or (at your option)
     any later version.
  
     Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
     more details.
  
     Under Section 7 of GPL version 3, you are granted additional
     permissions described in the GCC Runtime Library Exception, version
     3.1, as published by the Free Software Foundation.
  
     You should have received a copy of the GNU General Public License and
     a copy of the GCC Runtime Library Exception along with this program;
     see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     <http://www.gnu.org/licenses/>.  */
  
  /* This is a generic POSIX implementation of a mutex synchronization
     mechanism for libgomp.  This type is private to the library.  */
  
  #ifndef GOMP_PTRLOCK_H
  #define GOMP_PTRLOCK_H 1
  
  typedef struct { void *ptr; gomp_mutex_t lock; } gomp_ptrlock_t;
  
  static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr)
  {
    ptrlock->ptr = ptr;
    gomp_mutex_init (&ptrlock->lock);
  }
  
  static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock)
  {
    if (ptrlock->ptr != NULL)
      return ptrlock->ptr;
  
    gomp_mutex_lock (&ptrlock->lock);
    if (ptrlock->ptr != NULL)
      {
        gomp_mutex_unlock (&ptrlock->lock);
        return ptrlock->ptr;
      }
  
    return NULL;
  }
  
  static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr)
  {
    ptrlock->ptr = ptr;
    gomp_mutex_unlock (&ptrlock->lock);
  }
  
  static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock)
  {
    gomp_mutex_destroy (&ptrlock->lock);
  }
  
  #endif /* GOMP_PTRLOCK_H */
  