kc3-lang/gnulib/lib/windows-rwlock.h

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• Hash : 32a72f45
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  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/windows-rwlock.h

• /* Read-write locks (native Windows implementation).
     Copyright (C) 2005-2023 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file 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 Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2005.
     Based on GCC's gthr-win32.h.  */
  
  #ifndef _WINDOWS_RWLOCK_H
  #define _WINDOWS_RWLOCK_H
  
  #define WIN32_LEAN_AND_MEAN  /* avoid including junk */
  #include <windows.h>
  
  #include "windows-initguard.h"
  
  /* It is impossible to implement read-write locks using plain locks, without
     introducing an extra thread dedicated to managing read-write locks.
     Therefore here we need to use the low-level Event type.  */
  
  typedef struct
          {
            HANDLE *array; /* array of waiting threads, each represented by an event */
            unsigned int count; /* number of waiting threads */
            unsigned int alloc; /* length of allocated array */
            unsigned int offset; /* index of first waiting thread in array */
          }
          glwthread_carray_waitqueue_t;
  typedef struct
          {
            glwthread_initguard_t guard; /* protects the initialization */
            CRITICAL_SECTION lock; /* protects the remaining fields */
            glwthread_carray_waitqueue_t waiting_readers; /* waiting readers */
            glwthread_carray_waitqueue_t waiting_writers; /* waiting writers */
            int runcount; /* number of readers running, or -1 when a writer runs */
          }
          glwthread_rwlock_t;
  
  #define GLWTHREAD_RWLOCK_INIT { GLWTHREAD_INITGUARD_INIT }
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  extern void glwthread_rwlock_init (glwthread_rwlock_t *lock);
  extern int glwthread_rwlock_rdlock (glwthread_rwlock_t *lock);
  extern int glwthread_rwlock_wrlock (glwthread_rwlock_t *lock);
  extern int glwthread_rwlock_tryrdlock (glwthread_rwlock_t *lock);
  extern int glwthread_rwlock_trywrlock (glwthread_rwlock_t *lock);
  extern int glwthread_rwlock_unlock (glwthread_rwlock_t *lock);
  extern int glwthread_rwlock_destroy (glwthread_rwlock_t *lock);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* _WINDOWS_RWLOCK_H */
  

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