fix spelling

Author: Vladimir Kotal

intro.tex

@@ -253,7 +253,7 @@
 \item The first document is \emph{IEEE Std POSIX1003.1-1988}, formerly simply
 referred to as POSIX, then referenced as \emph{POSIX.1}, because by POSIX it is
 currently meant a set of related standards. POSIX.1 in back then contained
-programming API, i.e. work with proceses, signals, files, timers etc.
+programming API, i.e. work with processes, signals, files, timers etc.
 It was accepted by the ISO organization (\emph{ISO 9945-1:1990}) With small
 changes and is referred to as POSIX1990. IEEE reference is
 \emph{IEEE Std POSIX1003.1-1990}. This standard was a great success on its own
@@ -854,7 +854,7 @@
 \texttt{-E} & only preprocessor\\ 
 \texttt{-l} & link with the specified library\\
 \texttt{-L\emph{directory}} & add a directory to search when using \texttt{-l}\\
-\texttt{-O\emph{level}} & optimalization level\\
+\texttt{-O\emph{level}} & optimization level\\
 \texttt{-g} & compile with debug information\\
 \texttt{-D\emph{name}} & define a macro for the preprocessor\\
 \texttt{-I\emph{directory}} & add a directory to search for \texttt{\#include} files
@@ -1297,7 +1297,7 @@
 linker, and dynamic libraries constitute a single process.
 
 \item The following examples \emsl{are from Solaris}.  Finding equivalent
-commands and/or options on Linux is left as an excercise to the reader.
+commands and/or options on Linux is left as an exercise to the reader.
 \begin{itemize}
 \item ELF sections are listed via \texttt{elfdump -c} (GNU has
 \texttt{objdump} and \texttt{readelf}).  More on program sections on page
@@ -2287,7 +2287,7 @@
 the exceptional states are handled (page fault, memory protection failure,
 unknown instruction etc.). Some special tasks are handled by system processes
 running in kernel mode all the time.
-\item Classic UNIX kernel is monolitic. Originally it was necessary to
+\item Classic UNIX kernel is monolithic. Originally it was necessary to
 regenerate the kernel (i.e. compile from source code and link) whenever some
 kernel parameter had to be changed or add a device driver. In modern
 implementations it is possible to set many kernel parameters dynamically using

threads.tex

@@ -1156,7 +1156,7 @@
 The results and times to completion are radically different for situations
 when the program used plain addition, atomic arithmetic functions and locking
 using mutexes. There is difference in completion times between 
-arithmetic operation functions and mutexes is expecially notable on
+arithmetic operation functions and mutexes is especially notable on
 CPUs with hardware parallelism support.
 \item Similarly there is API for subtraction, bit operations
 AND and OR, value assignment atd.

unix_dict.txt

@@ -688,3 +688,11 @@ MULTIplexed
 Libes
 Ressler
 multiuser
+pthreads
+atfork
+sigmask
+pthreadsigmask
+sparc
+IPS
+ipcs
+ipcrm