lib/windows-cond.h

   1 /* Condition variables (native Windows implementation).
   2    Copyright (C) 2008-2024 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 */