From b699a736cc04e74327e06eba7759d1f4dca8d788 Mon Sep 17 00:00:00 2001
From: ginger88895 <soft_ginger@live.cn>
Date: Wed, 3 Apr 2019 00:14:39 +0800
Subject: [PATCH] Finished Part 4 with naive testing

---
 proj1/dump                                    | 3501 +++++++++++++++++
 proj1/nachos/threads/Communicator.class       |  Bin 461 -> 1440 bytes
 proj1/nachos/threads/KThread$1.class          |  Bin 601 -> 601 bytes
 proj1/nachos/threads/KThread$2.class          |  Bin 528 -> 528 bytes
 proj1/nachos/threads/KThread$AlarmTest.class  |  Bin 1525 -> 1525 bytes
 proj1/nachos/threads/KThread$ComTest.class    |  Bin 0 -> 1648 bytes
 .../threads/KThread$Condition2Test.class      |  Bin 1771 -> 1771 bytes
 proj1/nachos/threads/KThread$PingTest.class   |  Bin 1217 -> 1217 bytes
 proj1/nachos/threads/KThread.class            |  Bin 6867 -> 7020 bytes
 threads/Communicator.java                     |   58 +-
 threads/KThread.java                          |   46 +
 11 files changed, 3600 insertions(+), 5 deletions(-)
 create mode 100644 proj1/dump
 create mode 100644 proj1/nachos/threads/KThread$ComTest.class

diff --git a/proj1/dump b/proj1/dump
new file mode 100644
index 0000000..8b8a91f
--- /dev/null
+++ b/proj1/dump
@@ -0,0 +1,3501 @@
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diff --git a/proj1/nachos/threads/Communicator.class b/proj1/nachos/threads/Communicator.class
index 2981b3b409a5fdc95dc617e77858adace170bc99..8e530b624157db14475dc68769664459f5b0f19e 100644
GIT binary patch
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delta 274
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diff --git a/proj1/nachos/threads/KThread$1.class b/proj1/nachos/threads/KThread$1.class
index 13f7e4debb679261335156d8a9f69f090b36d9bc..725dddd4f71d3eaa7636857535ba71397d64b1d1 100644
GIT binary patch
delta 23
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delta 23
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diff --git a/proj1/nachos/threads/KThread$2.class b/proj1/nachos/threads/KThread$2.class
index 5ce1122b8a24650a5cc27ed2aac626c653e96306..adfd42ac033a1326f671f2907ce427375144af2c 100644
GIT binary patch
delta 19
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delta 19
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diff --git a/proj1/nachos/threads/KThread$AlarmTest.class b/proj1/nachos/threads/KThread$AlarmTest.class
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GIT binary patch
delta 59
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delta 59
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diff --git a/proj1/nachos/threads/KThread$ComTest.class b/proj1/nachos/threads/KThread$ComTest.class
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diff --git a/proj1/nachos/threads/KThread$Condition2Test.class b/proj1/nachos/threads/KThread$Condition2Test.class
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delta 123
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diff --git a/proj1/nachos/threads/KThread$PingTest.class b/proj1/nachos/threads/KThread$PingTest.class
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delta 55
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diff --git a/proj1/nachos/threads/KThread.class b/proj1/nachos/threads/KThread.class
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diff --git a/threads/Communicator.java b/threads/Communicator.java
index 47c0a6b..957f30f 100644
--- a/threads/Communicator.java
+++ b/threads/Communicator.java
@@ -9,11 +9,13 @@ import nachos.machine.*;
  * be a time when both a speaker and a listener are waiting, because the two
  * threads can be paired off at this point.
  */
-public class Communicator {
+public class Communicator
+{
     /**
      * Allocate a new communicator.
      */
-    public Communicator() {
+    public Communicator()
+	{
     }
 
     /**
@@ -26,7 +28,26 @@ public class Communicator {
      *
      * @param	word	the integer to transfer.
      */
-    public void speak(int word) {
+    public void speak(int word)
+	{
+		condLock.acquire();
+		if(protect==1) condProtect.sleep();
+		speakers++;
+		protect=1;
+		if(listeners==0)
+		{
+			condSpeaker.sleep();
+			message=word;
+			condPaired.wake();
+		}
+		else
+		{
+			message=word;
+			listeners--;
+			speakers--;
+			condListener.wake();
+		}
+		condLock.release();
     }
 
     /**
@@ -35,7 +56,34 @@ public class Communicator {
      *
      * @return	the integer transferred.
      */    
-    public int listen() {
-	return 0;
+    public int listen()
+	{
+		int ret=0;
+		condLock.acquire();
+		listeners++;
+		if(speakers==0) condListener.sleep();
+		else
+		{
+			speakers--;
+			listeners--;
+			condSpeaker.wake();
+			condPaired.sleep();
+		}
+		ret=message;
+		protect=0;
+		condProtect.wake();
+		condLock.release();
+		return ret;
     }
+
+	private int speakers=0;
+	private int listeners=0;
+	private int protect=0;
+	private int message=0;
+	private Lock condLock=new Lock();
+	private Condition condProtect=new Condition(condLock);
+	private Condition condSpeaker=new Condition(condLock);
+	private Condition condListener=new Condition(condLock);
+	private Condition condPaired=new Condition(condLock);
 }
+
diff --git a/threads/KThread.java b/threads/KThread.java
index 62f9108..ba6c52c 100644
--- a/threads/KThread.java
+++ b/threads/KThread.java
@@ -1,6 +1,7 @@
 package nachos.threads;
 
 import nachos.machine.*;
+import java.util.Random;
 
 /**
  * A KThread is a thread that can be used to execute Nachos kernel code. Nachos
@@ -500,6 +501,44 @@ public class KThread {
 		private int duration;
 	}
 
+	private static class ComTest implements Runnable
+	{
+		ComTest(int id,Communicator com)
+		{
+			this.id=id;
+			this.com=com;
+		}
+		public void run()
+		{
+			if(id<=48)
+			{
+				Random rand=new Random();
+				while(true)
+				{
+					int x=rand.nextInt(100);
+					System.out.println("Thread "+id+" speaking: "+x);
+					com.speak(x);
+					System.out.println("Thread "+id+" finished speaking: "+x);
+					ThreadedKernel.alarm.waitUntil(10000000);
+					//System.out.println("Thread "+id+" slept for "+(after-before)+" ticks");
+				}
+			}
+			else
+			{
+				while(true)
+				{
+					System.out.println("Thread "+id+" listening");
+					int x=com.listen();
+					System.out.println("Thread "+id+" received "+x);
+					ThreadedKernel.alarm.waitUntil(10000000);
+					//System.out.println("Thread "+id+" slept for "+(after-before)+" ticks");
+				}
+			}
+		}
+		private int id;
+		private Communicator com;
+	}
+
     /**
      * Tests whether this module is working.
      */
@@ -525,11 +564,18 @@ public class KThread {
 	*/
 
 	//Test for waitUntil
+	/*
 	new KThread(new AlarmTest(1,10000000)).fork();
 	new KThread(new AlarmTest(2,10000000)).fork();
 	new KThread(new AlarmTest(3,10000000)).fork();
 	new KThread(new AlarmTest(4,10000000)).fork();
 	new AlarmTest(0,50000000).run();
+	*/
+
+	//Test for Communicator
+	Communicator com=new Communicator();
+	for(int i=1;i<50;i++) new KThread(new ComTest(i,com)).fork();
+	new ComTest(0,com).run();
 
     }