1  /* Condition variables (native Windows implementation).
       2     Copyright (C) 2008-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file 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 Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Yoann Vandoorselaere <yoann@prelude-ids.org>, 2008.
      18     Based on Bruno Haible <bruno@clisp.org> lock.h */
      19  
      20  #ifndef _WINDOWS_COND_H
      21  #define _WINDOWS_COND_H
      22  
      23  #define WIN32_LEAN_AND_MEAN  /* avoid including junk */
      24  #include <windows.h>
      25  
      26  #include <time.h>
      27  
      28  #include "windows-initguard.h"
      29  
      30  #ifndef _glwthread_linked_waitqueue_link_defined
      31  #define _glwthread_linked_waitqueue_link_defined
      32  struct glwthread_waitqueue_link
      33  {
      34    struct glwthread_waitqueue_link *wql_next;
      35    struct glwthread_waitqueue_link *wql_prev;
      36  };
      37  #endif /* _glwthread_linked_waitqueue_link_defined */
      38  
      39  typedef struct
      40          {
      41            struct glwthread_waitqueue_link wq_list; /* circular list of waiting threads */
      42          }
      43          glwthread_linked_waitqueue_t;
      44  
      45  typedef struct
      46          {
      47            glwthread_initguard_t guard; /* protects the initialization */
      48            CRITICAL_SECTION lock; /* protects the remaining fields */
      49            glwthread_linked_waitqueue_t waiters; /* waiting threads */
      50          }
      51          glwthread_cond_t;
      52  
      53  #define GLWTHREAD_COND_INIT { GLWTHREAD_INITGUARD_INIT }
      54  
      55  #ifdef __cplusplus
      56  extern "C" {
      57  #endif
      58  
      59  extern int glwthread_cond_init (glwthread_cond_t *cond);
      60  /* Here, to cope with the various types of mutexes, the mutex is a 'void *', and
      61     the caller needs to pass the corresponding *_lock and *_unlock functions.  */
      62  extern int glwthread_cond_wait (glwthread_cond_t *cond,
      63                                  void *mutex,
      64                                  int (*mutex_lock) (void *),
      65                                  int (*mutex_unlock) (void *));
      66  extern int glwthread_cond_timedwait (glwthread_cond_t *cond,
      67                                       void *mutex,
      68                                       int (*mutex_lock) (void *),
      69                                       int (*mutex_unlock) (void *),
      70                                       const struct timespec *abstime);
      71  extern int glwthread_cond_signal (glwthread_cond_t *cond);
      72  extern int glwthread_cond_broadcast (glwthread_cond_t *cond);
      73  extern int glwthread_cond_destroy (glwthread_cond_t *cond);
      74  
      75  #ifdef __cplusplus
      76  }
      77  #endif
      78  
      79  #endif /* _WINDOWS_COND_H */