[Linux Kernel] Mutex Sample

 Mutex Sample

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#include<stdio.h>

#include<string.h>

#include<pthread.h>

#include<stdlib.h>

#include<unistd.h>

pthread_t tid[2];

int counter;

pthread_mutex_t lock;

void* doSomeThing(void *arg)

{

    pthread_mutex_lock(&lock);

    unsigned long i = 0;

    counter += 1;

    printf("\n Job %d started\n", counter);

    for(i=0; i<(0xFFFFFFFF);i++);

    printf("\n Job %d finished\n", counter);

    pthread_mutex_unlock(&lock);

    return NULL;

}

int main(void)

{

    int i = 0;

    int err;

    if (pthread_mutex_init(&lock, NULL) != 0)

    {

        printf("\n mutex init failed\n");

        return 1;

    }

    while(i < 2)

    {

        err = pthread_create(&(tid[i]), NULL, &doSomeThing, NULL);

        if (err != 0)

            printf("\ncan't create thread :[%s]", strerror(err));

        i++;

    }

    pthread_join(tid[0], NULL);

    pthread_join(tid[1], NULL);

    pthread_mutex_destroy(&lock);

    return 0;

}

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 Job 1 started

 Job 1 finished

 Job 2 started

 Job 2 finished