C Programming For Mutex Variable Using Pthread

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

void *functionC();
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
int  counter = 0;

    int rc1, rc2;
    pthread_t thread1, thread2;

    /* Create independent threads each of which will execute functionC */

    if( (rc1=pthread_create( &thread1, NULL, &functionC, NULL)) )
        printf("Thread creation failed: %d\n", rc1);

    if( (rc2=pthread_create( &thread2, NULL, &functionC, NULL)) )
        printf("Thread creation failed: %d\n", rc2);
    /* Wait till threads are complete before main continues. Unless we  */
    /* wait we run the risk of executing an exit which will terminate   */
    /* the process and all threads before the threads have completed.   */
    pthread_join( thread1, NULL);
    pthread_join( thread2, NULL);

void *functionC()
    pthread_mutex_lock( &mutex1 );
    printf("Counter value: %d\n",counter);
    pthread_mutex_unlock( &mutex1 );


gcc -o mutex mutex.c -lpthread


Counter value: 1
Counter value: 2

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