A file named pthread-data-sharing-mutex.cpp has been provided to you in the same project.

Compile the program and execute it several times, at least 10. Make sure to pay close attention to the output that the program produces.

Answer the following questions about the programs behavior:

1. What does it do?

2. What output does it produce?

3. Examine the program code carefully. Is the program functioning correctly?

4. If you do not think that the program is working correctly, describe why?

#include #include

int count;

void* myFunction(void* arg) { int actual_arg = *((int*) arg); for(unsigned int i = 0; i < 10; ++i) { count++; std::cout << "Thread #" << actual_arg << " count = " << count << std::endl; } pthread_exit(NULL); }

int main() { int rc[2]; pthread_t ids[2]; int args[2]; count = 0; for(unsigned int i = 0; i < 2; ++i) { args[i] = i; rc[i] = pthread_create(&ids[i], NULL, myFunction, (void*) &args[i]); } for(unsigned int i = 0; i < 2; ++i) { pthread_join(ids[i], NULL); } std::cout << "Final count = " << count << std::endl; pthread_exit(NULL); }