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POSIX 1003.1 - man page for semaphore.h (posix section 0p)

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

       semaphore.h - semaphores (REALTIME)

       #include <semaphore.h>

       The  <semaphore.h> header shall define the sem_t type, used in performing semaphore opera-
       tions. The semaphore may be implemented using a file descriptor, in  which  case  applica-
       tions  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.




       <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()

       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 orig-
       inal 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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