?? semaphore.h
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/* Copyright (C) 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */#ifndef _SEMAPHORE_H# error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."#endif#include <bits/wordsize.h>#if __WORDSIZE == 64# define __SIZEOF_SEM_T 32#else# define __SIZEOF_SEM_T 16#endif/* Value returned if `sem_open' failed. */#define SEM_FAILED ((sem_t *) 0)typedef union{ char __size[__SIZEOF_SEM_T]; long int __align;} sem_t;
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