Quiz 4.2.a: Threads synchonization

Write a C++ program that synchronizes two threads to replicate a TCP 2-way handshake.

One thread prints SYN and the other thread prints ACK.

The program takes one command line argument, which is the number of SYN, ACK pairs to output:

./handshake 10 would output 10 pairs of SYN, ACK.

The program should launch two threads and output the SYNs and ACKs in a strictly alternating fashion.

Sample output for a count of 10

[0] SYN ... ACK
[1] SYN ... ACK
[2] SYN ... ACK
[3] SYN ... ACK
[4] SYN ... ACK
[5] SYN ... ACK
[6] SYN ... ACK
[7] SYN ... ACK
[8] SYN ... ACK
[9] SYN ... ACK

Important notes:

1. The program should create two threads -- one runs the void query() {...}, while the other runs void response() {...}.
2. Provide the threads with necessary args (e.g., the counter, synchronization primitives etc.)
3. Your choice of synchronization primitives are limited to semaphores, condition variables, and mutexes.
4. Use of sleep is not permitted.
5. All SYN prints should come from the thread running void query() {...}; while all ACK prints should come from the other thread running void response() {...}.