#include #include #include void *functionC(); pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER; int counter = 0; main() { 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); exit(0); } void *functionC() { pthread_mutex_lock( &mutex1 ); counter++; printf("Counter value: %d\n",counter); pthread_mutex_unlock( &mutex1 ); }