Explain the need for a semaphore in Linux kernel.

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sem_unlink

SEM_UNLINK(3)						     Linux Programmer's Manual						     SEM_UNLINK(3)

NAME

       sem_unlink - remove a named semaphore

SYNOPSIS

       #include <semaphore.h>

       int sem_unlink(const char *name);

       Link with -pthread.

DESCRIPTION

       sem_unlink()  removes the named semaphore referred to by name.  The semaphore name is removed immediately.  The semaphore is destroyed once
       all other processes that have the semaphore open close it.

RETURN VALUE

       On success sem_unlink() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS

       EACCES The caller does not have permission to unlink this semaphore.

       ENAMETOOLONG
	      name was too long.

       ENOENT There is no semaphore with the given name.

CONFORMING TO

       POSIX.1-2001.

SEE ALSO

       sem_getvalue(3), sem_open(3), sem_post(3), sem_wait(3), sem_overview(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-05-13							     SEM_UNLINK(3)

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