Changes

;New state variablesWe add new state variables (a lock, four counters, and two condition variables): . {{c|<pre>Lock lock = new Lock()int activeSpeakers= 0int waitingSpeakers= 0int activeListeners= 0int waitingListeners= 0Condition speakers

Condition return</pre>}} * The first lone speaker or listener will be counted as ''active'', or in the process of exchanging a message and returning, and will sleep on the {{c|return }} condition variable until its counterpart wakes it up so that they can both return. * A second thread performing the same action as a currently active thread will be counted as ''waiting'', and be put to sleep on its respective condition variable. Otherwise, it will check if there is an ''active '' thread of its counterpart action waiting on the {{c|return }} condition variable. If there isn’tisn't, it will attempt to wake waiting threads of its counterpart action prior to going to sleep on the return condition variable. If there is a counterpart ''active '' thread, it will wake it up and they both will return. Prior to returning, a the counterpart action will also attempt to wake sleeping ''waiting '' threads of its type.* Any interjecting threads that execute in between an exchange of message will be stopped by the ''active '' counters, which do not decrement until BOTH '''both''' counterparts in the exchange have returned.

First, we set up a manual sequence of {{c|speak() }} and {{c|listen() }} actions on different threads and executed them in a particular order, verifying that the resulting sequence of messages was correct, monitored via print statements to the console

ThirdFinally, we used testing functions: MassSpeaker and MassListener are designed to be run by a single thread each. These runnables iterate until a given limitrepeated the same procedure, and on each iteration, there is a 50% chance that a speak (or listen) is called. After each iteration, the thread yields to the opposite thread to do but intermingled the same. Debug statements will display what threads are doing at each iteration and how messages are being exchanged. With this we can generate large amounts creation of calls with randomized orders between two threads, speakers and will be able to verify all speaks are correctly received by a listenlisteners via {{c|.A second set of runnables, MassTSpeaker and MassTListener, are designed to fork off several threads themselves()}}, with each of these forked threads performing a single speak or listen. These forked threads are also executed with 50% chance on each iteration to provide random ordering. We can also verify if such that listeners would start listening before all threads are correctly paired off via print statements to consolethe speakers were queued up.

The latter two To be able to perform these tests were run with up to 500 threads , we created a number of speakers helper classes. {{c|MassSpeaker}} and listeners {{c|MassListener}} are designed to be run by a single thread each (with . These runnables iterate until a temporary override given limit, and on each iteration, there is a 50% chance that a speak (or listen) is called. After each iteration, the number thread yields to the opposite thread to do the same. Debug statements will display what threads are doing at each iteration and how messages are being exchanged. With this we can generate large amounts of max calls with randomized orders between two threads in Nachos) , and the number will be able to verify all speaks are correctly received by a listen. A second set of listen runnables, {{c|MassTSpeaker}} and {{c|MassTListener}}, are designed to fork off several threads themselves, with each of these forked threads performing a single speak operations was analyzed or listen. These forked threads are also executed with 50% chance on each iteration to provide random ordering. We can also verify if all threads are correctly paired off via script. The speakers and listeners would print statements while executing code, which allowed us to perform this analysisconsole.

===Pseudocode==={|| style="vertical-align: top;"| speak(int word) {