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Unix (officially trademarked as UNIX, sometimes also written as Unix in small caps) is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, Michael Lesk and Joe Ossanna. The Unix operating system was first developed in assembly language, but by 1973 had been almost entirely recoded in C, greatly facilitating its further development and porting to other hardware. Today's Unix system evolution is split into various branches, developed over time by AT&T as well as various commercial vendors, universities (such as University of California, Berkeley's BSD), and non-profit organizations.

The Open Group, an industry standards consortium, owns the UNIX trademark. Only systems fully compliant with and certified according to the Single UNIX Specification are qualified to use the trademark; others might be called Unix system-like or Unix-like, although the Open Group disapproves of this term. However, the term Unix is often used informally to denote any operating system that closely resembles the trademarked system.

During the late 1970s and early 1980s, the influence of Unix in academic circles led to large-scale adoption of Unix (particularly of the BSD variant, originating from the University of California, Berkeley) by commercial startups, the most notable of which are Solaris, HP-UX, Sequent, and AIX, as well as Darwin, which forms the core set of components upon which Apple's OS X, Apple TV, and iOS are based.

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Basic example of UNIX programming is as follows :


* An example source module to accompany...
* "Using POSIX Threads: Programming with Pthreads"
* by Brad nichols, Dick Buttlar, Jackie Farrell
* O'Reilly & Associates, Inc.
* simple_threads.c
* Simple multi-threaded example.
* Creates two threads. While doing different things, they
* both access and modify variables with global scope.
* Those vars have been tought to be modified this way, so
* this is *not* an example of a thread side effect. If each
* thread'd been accessing the same variable, they could create
* such kind of problems.
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <pthread.h>

void do_one_thing(int *); /* first function to thread */
void do_another_thing(int *); /* second function to thread */
void do_wrap_up(int, int); /* after joining threads... */

int r1 = 0, r2 = 0;

extern int
/* ids for the first and the second thread */
pthread_t thread1, thread2;

/* creating the first thread. retval != 0 means troubles */
if (pthread_create(&thread1,
(void *) do_one_thing,
(void *) &r1) != 0)
perror("pthread_create"), exit(1);

/* creating the first thread. retval != 0 means troubles.
* its argument is passed with a void * casting as requested
* by pthread_create. The actual function expects an int. */
if (pthread_create(&thread2,
(void *) do_another_thing,
(void *) &r2) != 0)
perror("pthread_create"), exit(1);

/* waiting for the first thread to terminate.
* Thread's return(/exit) value gets discarded. */
if (pthread_join(thread1, NULL) != 0)

/* waiting for the second thread */
if (pthread_join(thread2, NULL) != 0)

do_wrap_up(r1, r2);

return 0;

void do_one_thing(int *pnum_times)
int i, j, x;

for (i = 0; i < 4; i++) {
printf("doing one thing\n");
for (j = 0; j < 10000; j++) x = x + i;


void do_another_thing(int *pnum_times)
int i, j, x;

for (i = 0; i < 4; i++) {
printf("doing another \n");
for (j = 0; j < 10000; j++) x = x + i;


void do_wrap_up(int one_times, int another_times)
int total;

total = one_times + another_times;
printf("All done, one thing %d, another %d for a total of %d\n",
one_times, another_times, total);


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