1  /* Copyright (C) 2002-2023 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