The C and C++ Include Header Files

/usr/include/semaphore.h


$ cat -n /usr/include/semaphore.h

     1	/* Copyright (C) 2002-2024 Free Software Foundation, Inc.
     2	   This file is part of the GNU C Library.
     3	
     4	   The GNU C Library is free software; you can redistribute it and/or
     5	   modify it under the terms of the GNU Lesser General Public
     6	   License as published by the Free Software Foundation; either
     7	   version 2.1 of the License, or (at your option) any later version.
     8	
     9	   The GNU C Library 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 GNU
    12	   Lesser General Public License for more details.
    13	
    14	   You should have received a copy of the GNU Lesser General Public
    15	   License along with the GNU C Library; if not, see
    16	   <https://www.gnu.org/licenses/>.  */
    17	
    18	#ifndef _SEMAPHORE_H
    19	#define _SEMAPHORE_H	1
    20	
    21	#include <features.h>
    22	#include <sys/types.h>
    23	#ifdef __USE_XOPEN2K
    24	# include <bits/types/struct_timespec.h>
    25	#endif
    26	
    27	/* Get the definition for sem_t.  */
    28	#include <bits/semaphore.h>
    29	
    30	
    31	__BEGIN_DECLS
    32	
    33	/* Initialize semaphore object SEM to VALUE.  If PSHARED then share it
    34	   with other processes.  */
    35	extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value)
    36	  __THROW __nonnull ((1));
    37	
    38	/* Free resources associated with semaphore object SEM.  */
    39	extern int sem_destroy (sem_t *__sem) __THROW __nonnull ((1));
    40	
    41	/* Open a named semaphore NAME with open flags OFLAG.  */
    42	extern sem_t *sem_open (const char *__name, int __oflag, ...)
    43	  __THROW __nonnull ((1));
    44	
    45	/* Close descriptor for named semaphore SEM.  */
    46	extern int sem_close (sem_t *__sem) __THROW __nonnull ((1));
    47	
    48	/* Remove named semaphore NAME.  */
    49	extern int sem_unlink (const char *__name) __THROW __nonnull ((1));
    50	
    51	/* Wait for SEM being posted.
    52	
    53	   This function is a cancellation point and therefore not marked with
    54	   __THROW.  */
    55	extern int sem_wait (sem_t *__sem) __nonnull ((1));
    56	
    57	#ifdef __USE_XOPEN2K
    58	/* Similar to `sem_wait' but wait only until ABSTIME.
    59	
    60	   This function is a cancellation point and therefore not marked with
    61	   __THROW.  */
    62	# ifndef __USE_TIME_BITS64
    63	extern int sem_timedwait (sem_t *__restrict __sem,
    64				  const struct timespec *__restrict __abstime)
    65	  __nonnull ((1, 2));
    66	# else
    67	#  ifdef __REDIRECT
    68	extern int __REDIRECT (sem_timedwait,
    69	                       (sem_t *__restrict __sem,
    70	                        const struct timespec *__restrict __abstime),
    71	                        __sem_timedwait64)
    72	  __nonnull ((1, 2));
    73	#  else
    74	#   define sem_timedwait __sem_timedwait64
    75	#  endif
    76	# endif
    77	#endif
    78	
    79	#ifdef __USE_GNU
    80	# ifndef __USE_TIME_BITS64
    81	extern int sem_clockwait (sem_t *__restrict __sem,
    82				  clockid_t clock,
    83				  const struct timespec *__restrict __abstime)
    84	  __nonnull ((1, 3));
    85	# else
    86	#  ifdef __REDIRECT
    87	extern int __REDIRECT (sem_clockwait,
    88	                       (sem_t *__restrict __sem,
    89	                        clockid_t clock,
    90	                        const struct timespec *__restrict __abstime),
    91	                        __sem_clockwait64)
    92	  __nonnull ((1, 3));
    93	#  else
    94	#   define sem_clockwait __sem_clockwait64
    95	#  endif
    96	# endif
    97	#endif
    98	
    99	/* Test whether SEM is posted.  */
   100	extern int sem_trywait (sem_t *__sem) __THROWNL __nonnull ((1));
   101	
   102	/* Post SEM.  */
   103	extern int sem_post (sem_t *__sem) __THROWNL __nonnull ((1));
   104	
   105	/* Get current value of SEM and store it in *SVAL.  */
   106	extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
   107	  __THROW __nonnull ((1, 2));
   108	
   109	
   110	__END_DECLS
   111	
   112	#endif	/* semaphore.h */