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Pthreads in Operating System

Posted on December 6, 2021December 6, 2021 By christo No Comments on Pthreads in Operating System

Pthreads refers to the POSIX standard (IEEE 1003.1c) defining an API for thread creation and synchronization. This is a specification for thread behavior, not an implementation. Operating-system designers may implement the specification in any way they wish. Numerous systems implement the Pthreads specification; most are UNIX-type systems, including Linux, Mac OS X, and Solaris. Although Windows doesn’t support Pthreads natively, some third party implementations for Windows are available

#include <pthread.h>
#include <stdio.h>
int sum; /* this data is shared by the thread(s) */
void *runner(void *param); /* threads call this function */
int main(int argc, char *argv[])
{
pthread t tid; /* the thread identifier */
pthread attr t attr; /* set of thread attributes */
if (argc != 2) {
fprintf(stderr,"usage: a.out <integer value>\n");
return -1;
}
if (atoi(argv[1]) < 0) {
fprintf(stderr,"%d must be >= 0\n",atoi(argv[1]));
return -1;
}
/* get the default attributes */
pthread attr init(&attr);
/* create the thread */
pthread create(&tid,&attr,runner,argv[1]);
/* wait for the thread to exit */
pthread join(tid,NULL);
printf("sum = %d\n",sum);
}
/* The thread will begin control in this function */
void *runner(void *param)
{
int i, upper = atoi(param);
sum = 0;
for (i = 1; i <= upper; i++)
sum += i;
pthread exit(0);
}
operating system Tags:operating system, Pthreads in Operating System

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