OS Use of Threads C Program

Operating Systems Lab Manual / OS Use of Threads C Program

Program Name

Write a program for use of threads.

Theory

Thread is a light weight program. Threads can run in parallel.

Program Code

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

void *display1_function( void *ptr );
void *display2_function( void *ptr );

int main()
{
pthread_t thread1, thread2;
char *message1 = "Thread 1";
char *message2 = "Thread 2";
int  ret1, ret2;

ret1 = pthread_create( &thread1, NULL, display1_function, (void*) message1);
ret2 = pthread_create( &thread2, NULL, display2_function, (void*) message2);

pthread_join( thread1, NULL);
pthread_join( thread2, NULL); 

printf("Thread 1 returns: %d\n",ret1);
printf("Thread 2 returns: %d\n",ret2);
return 0;
}

void *display1_function( void *ptr )
{
printf("Hai from Thread1\n");
}

void *display2_function( void *ptr )
{
printf("Bye from Thread2\n");
}

Input:

Output:
Bye from Thread2
Hai from Thread1
Thread 1 returns: 0
Thread 2 returns: 0

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