sem_unlink() deserves to be on the slide

Author: vladak

synchro.tex

@@ -620,8 +620,7 @@
 \end{minipage}
 ]]])
 \begin{itemize}
-\item creates or opens a new POSIX semaphore.  \emph{mode} is same as for
-\funnm{open}().  Use ``\texttt{/somename}'' for the \emph{name}.
+\item creates or opens a new POSIX semaphore.
 \end{itemize}
 ifdef([[[NOSPELLCHECK]]], [[[
 \texttt{int \funnm{sem\_wait}(sem\_t *\emph{sem});}
@@ -639,16 +638,20 @@
 ifdef([[[NOSPELLCHECK]]], [[[
 \texttt{int \funnm{sem\_close}(sem\_t *\emph{sem});}
 ]]])
+ifdef([[[NOSPELLCHECK]]], [[[
+\texttt{int \funnm{sem\_unlink}(sem\_t *\emph{sem});}
+]]])
 \begin{itemize}
 \item close \emph{\texttt{sem}}, free its resources allocated to \emsl{this}
-process.
+process or \emsl{system}, respectively.
 \end{itemize}
 \end{slide}
 
 \begin{itemize}
 \item The POSIX semaphore APIs are part of the \emph{POSIX Realtime Extension}
 and are optional. For example, macOS supports only named POSIX semaphores.
-\item \emph{value} is the initial semaphore value
+\item \emph{mode} is same as for \funnm{open}().  Use ``\texttt{/somename}''
+for the \emph{name}.  \item \emph{value} is the initial semaphore value.
 \item Both the \emph{mode} and \emph{value} parameters are optional. This means
 that \emph{mode} has to be specified in order to set the initial value.
 \item Named semaphore might appear on a file system. Usually in the form of