Answered Essay: Thread #1 count 1 Thread #1 count 2 Th read #1 count 3 Th read #1 count 4 Th read #1 count 5 Th read #1 count 6 Th read #1 count 7 Th rea

Execute the pthread_join program several times.

Examine the output carefully. You should notice a problem in the implementation. Make sure to follow the logic in main() and to read the comments carefully.

Read the Linux manual page that describes the pthread_join function
[URL: https://linux.die.net/man/3/pthread_join] and make sure that you understand the functionality that pthread_join provides and how to call (invoke) this function.

Correct the problem. Look for the // TODO comment and address it (i.e., implement the functionality described in the comment). Hint: The solution requires only one (1) line of code.

Build and run your program and make sure that it works correctly.

Expected Output:
Your program should produce the following output
Thread #1 count 1 Thread #1 count 2 Th read #1 count 3 Th read #1 count 4 Th read #1 count 5 Th read #1 count 6 Th read #1 count 7 Th read #1 count 8 Th read #1 count 9 Th read #1 count 10 Thread #1 done! Final count 10

code

#include <iostream>
#include <pthread.h>

int count = 0;

// This function implements the code that is
// executed by the thread.
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);
}

// This program creates one thread, waits for it
// to finish its job and exits.
int main()
{
int rc;
pthread_t the_thread;
int arg = 1; // Data being passed to the thread

// Create a new thread
rc = pthread_create(&the_thread, NULL, myFunction, (void*) &arg);

// Wait for the thread to do its job, then finish

// TODO: Implement a call to pthread_join to ensure
// that main() waits for the thread to finish
// before continuing.

std::cout << “Thread #” << arg << ” done!” << std::endl;

std::cout << “Final count = ” << count << std::endl;

pthread_exit(NULL);

return 0;
}

Thread #1 count 1 Thread #1 count 2 Th read #1 count 3 Th read #1 count 4 Th read #1 count 5 Th read #1 count 6 Th read #1 count 7 Th read #1 count 8 Th read #1 count 9 Th read #1 count 10 Thread #1 done! Final count 10

Expert Answer

 

The program just required knowledge of using threads in c++. pthread_join waits for the thread specified by the function to terminate. If the thread has already terminated then the function returns immediately. Following is the implementation of the program:

#include <iostream>
#include <pthread.h>
int count = 0;
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;
pthread_t the_thread;
int arg = 1;

rc = pthread_create(&the_thread, NULL, myFunction, (void*) &arg);

pthread_join(the_thread,NULL); //waits for the thread to join

std::cout << “Thread #” << arg << ” done!” << std::endl;

std::cout << “Final count = ” << count << std::endl;

pthread_exit(NULL);

return 0;
}

Output:

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