semaphore.h man page on CentOS

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<semaphore.h>(P)	   POSIX Programmer's Manual	      <semaphore.h>(P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       semaphore.h - semaphores (REALTIME)

SYNOPSIS
       #include <semaphore.h>

DESCRIPTION
       The <semaphore.h> header shall define the sem_t type, used in  perform‐
       ing semaphore operations. The semaphore may be implemented using a file
       descriptor, in which case applications are able to open up at  least  a
       total  of  {OPEN_MAX} files and semaphores. The symbol SEM_FAILED shall
       be defined (see sem_open()).

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

	      int    sem_close(sem_t *);
	      int    sem_destroy(sem_t *);
	      int    sem_getvalue(sem_t *restrict, int *restrict);
	      int    sem_init(sem_t *, int, unsigned);
	      sem_t *sem_open(const char *, int, ...);
	      int    sem_post(sem_t *);

	      int    sem_timedwait(sem_t *restrict, const struct timespec *restrict);

	      int    sem_trywait(sem_t *);
	      int    sem_unlink(const char *);
	      int    sem_wait(sem_t *);

       Inclusion  of the <semaphore.h> header may make visible symbols defined
       in the headers <fcntl.h> and <sys/types.h>.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <fcntl.h>  ,  <sys/types.h>  ,  the   System   Interfaces   volume   of
       IEEE Std 1003.1-2001,	sem_destroy(),	 sem_getvalue(),   sem_init(),
       sem_open(), sem_post(), sem_timedwait(),	 sem_trywait(),	 sem_unlink(),
       sem_wait()

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003		      <semaphore.h>(P)
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