nptl/semaphoreP.h

   1 /* Copyright (C) 2002-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Ulrich Drepper <drepper@redhat.com>, 2002.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <semaphore.h>
  20 #include <futex-internal.h>
  21 #include "pthreadP.h"
  22
  23 #define SEM_SHM_PREFIX  "sem."
  24
  25 static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
  26 {
  27 #if __HAVE_64B_ATOMICS
  28   sem->data = value;
  29 #else
  30   sem->value = value << SEM_VALUE_SHIFT;
  31   sem->nwaiters = 0;
  32 #endif
  33   /* pad is used as a mutex on pre-v9 sparc and ignored otherwise.  */
  34   sem->pad = 0;
  35
  36   /* This always is a shared semaphore.  */
  37   sem->private = FUTEX_SHARED;
  38 }
  39
  40 /* Prototypes of functions with multiple interfaces.  */
  41 extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value);
  42 extern int __old_sem_init (sem_t *sem, int pshared, unsigned int value);
  43 extern int __new_sem_destroy (sem_t *sem);
  44 extern int __new_sem_post (sem_t *sem);
  45 extern int __new_sem_wait (sem_t *sem);
  46 extern int __old_sem_wait (sem_t *sem);
  47 extern int __new_sem_trywait (sem_t *sem);
  48 extern int __new_sem_getvalue (sem_t *sem, int *sval);
  49
  50 #if __TIMESIZE == 64
  51 # define __sem_clockwait64 __sem_clockwait
  52 # define __sem_timedwait64 __sem_timedwait
  53 #else
  54 extern int
  55 __sem_clockwait64 (sem_t *sem, clockid_t clockid,
  56                    const struct __timespec64 *abstime);
  57 libc_hidden_proto (__sem_clockwait64)
  58 extern int
  59 __sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime);
  60 libc_hidden_proto (__sem_timedwait64)
  61 #endif