sysdeps/htl/bits/semaphore.h

   1 /* Semaphore type.  Generic version.
   2    Copyright (C) 2005-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library;  if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _BITS_SEMAPHORE_H
  20 #define _BITS_SEMAPHORE_H       1
  21
  22 #ifndef _SEMAPHORE_H
  23 # error Never include <bits/semaphore.h> directly.
  24 #endif
  25
  26 #include <bits/types/__pthread_spinlock_t.h>
  27 #include <bits/pthread.h>
  28
  29 /* User visible part of a semaphore.  */
  30 struct __semaphore
  31 {
  32   __pthread_spinlock_t __lock;
  33   struct __pthread *__queue;
  34   int __pshared;
  35   int __value;
  36   void *__data;
  37 };
  38
  39 typedef struct __semaphore sem_t;
  40
  41 #define SEM_FAILED ((void *) 0)
  42
  43 /* Initializer for a semaphore.  */
  44 #define __SEMAPHORE_INITIALIZER(pshared, value) \
  45   { __PTHREAD_SPIN_LOCK_INITIALIZER, NULL, (pshared), (value), NULL }
  46
  47 #endif /* bits/semaphore.h */