1  /* Spin locks (native Windows implementation).
       2     Copyright (C) 2019-2021 Free Software Foundation, Inc.
       3  
       4     This program is free software; you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation; either version 3, or (at your option)
       7     any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program; if not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2019.  */
      18  
      19  #ifndef _WINDOWS_SPIN_H
      20  #define _WINDOWS_SPIN_H
      21  
      22  #define WIN32_LEAN_AND_MEAN  /* avoid including junk */
      23  #include <windows.h>
      24  
      25  typedef struct
      26          {
      27            LONG volatile word;
      28          }
      29          glwthread_spinlock_t;
      30  
      31  #define GLWTHREAD_SPIN_INIT { 0 }
      32  
      33  #ifdef __cplusplus
      34  extern "C" {
      35  #endif
      36  
      37  extern void glwthread_spin_init (glwthread_spinlock_t *lock);
      38  extern int glwthread_spin_lock (glwthread_spinlock_t *lock);
      39  extern int glwthread_spin_trylock (glwthread_spinlock_t *lock);
      40  extern int glwthread_spin_unlock (glwthread_spinlock_t *lock);
      41  extern int glwthread_spin_destroy (glwthread_spinlock_t *lock);
      42  
      43  #ifdef __cplusplus
      44  }
      45  #endif
      46  
      47  #endif /* _WINDOWS_SPIN_H */