Comments by Afnan_ (Top 42 by date)

After debugging, we have reached the following conclusion:
The Method_Encryption is causing all the problems (shared variables are being accessed at the same time causing this issue. So we are going to lock (using mutex)the variables inside the method rather than on the structs.

This is the part of the code that has the problem:

void Encryption()
{
int i = 0, j = 0, rc=0;
ourStruct args[Chunks];
pthread_t thread[Threads];

ReadOurFile();
counter = 0;
for (j = 0; j <= numOfChunks; j++)
{
for (i = 0; i < numOfRows; ++i)
{
args[j].plainText[i] = InPut[j][i];
args[j].FinalKey[i] = FinalKey[j][i];
}
args[j].index = counter;
counter++;
}
for (j = 0; j <= numOfChunks; j=j+2)
{
rc = pthread_create(&thread[0], NULL, Method_Encryption, &args[j]);
rc = pthread_create(&thread[1], NULL, Method_Encryption, &args[j+1]);
rc = pthread_join(thread[0], NULL);
rc = pthread_join(thread[1], NULL);
}
//writing the output to a file
}

The method is:
void * Method_Encryption(void *arguments){
.
.
.
StructInside *args = (StructInside *)arguments;
//setting the received arguments into plaintext and key
for (i = 0; i < numOfRows; ++i)
{
plainText[i] = args->plainText[i];
FinalKey[i] = args->FinalKey[i];
}
.
.
.
//store results
for (i = 0; i < numOfRows; ++i)
OutPut[args->index][i] = plainText[i];
}

The output is filled inside an array of output inside the method. The array is indexed by the order.
numOfChunks ==the number of chunks I'm reading from the file. For example: if the file is of size 100 characters, and each chunk will be of size 5 characters, then:
numOfChunks=100/5
We also tried using mutex inside the struct and initialize the mutex and lock it inside the method and afterwards unlocking and destroying the mutex but it didn’t work, or maybe we didn’t implement it correctly.

This is the .aspx file
___________________________
<%@ Page Language="C#" MasterPageFile="~/AdminBookStore.master" AutoEventWireup="true"
CodeFile="ManageCategoriesPage.aspx.cs" Inherits="ManageCategoriesPage" Title="Manage Categories Page" %>



<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<ajax:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true">

<script type="text/javascript">
/*-----------------------------------------------------------*/
var TotalChkBx;
var Counter;

window.onload = function()
{
//Get total no. of CheckBoxes inside the GridView.
TotalChkBx = parseInt('<%= this.gvManageCategories.Rows.Count %>');
//Get total no. of checked CheckBoxes in side the GridView.
Counter = 0;
}
/*-----------------------------------------------------------*/
function HeaderClick(HCheckBox)
{
//Get target base & child control.
var TargetBaseControl = document.getElementById('<%= this.gvManageCategories.ClientID %>');
var TargetChildControl = "chRowSelect";

//Get all the control of the type INPUT in the base control.
var Inputs = TargetBaseControl.getElementsByTagName("input");

//Checked/Unchecked all the checkBoxes inside the GridView.
for(var n = 0; n < Inputs.length; ++n)
if(Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl,0) >= 0)
Inputs[n].checked = HCheckBox.checked;

//Reset Counter
Counter = HCheckBox.checked ? TotalChkBx : 0;
}
/*-----------------------------------------------------------*/
function ChildClick(RCheckBox, HCheckBox)
{
//get target base & child control.
var HeaderCheckBox = document.getElementById(HCheckBox);
//Modifiy Counter;
if(RCheckBox.checked && Counter < TotalChkBx)
Counter++;
else if(Counter > 0)
Counter--;

//Change state of the header CheckBox.
if(Counter < TotalChkBx)
HeaderCheckBox.checked = false;
else if(Counter == TotalChkBx)
HeaderCheckBox.checked = true;

}
/*-----------------------------------------------------------*/
function bConfirm()
{
var bValidDelete=false;
var lblValidate = document.getElementById('<%= this.lblValidate.ClientID %>');
var TargetBaseControl = document.getElementById('<%= this.gvManageCategories.ClientID %>');
var TargetChildControl = "chRowSelect";

//Get all the control of the type INPUT in the base control.
var Inputs = TargetBaseControl.getElementsByTagName("input");
for(var n = 0; n < Inputs.length; ++n)
if(Inputs[n].type == 'checkbox' && Inputs[n].checked==true)
{
bValidDelete = true;
break;//At least one is checked
}
if(bValidDelete)
if (confirm("Are you sure you want to delete selected categories")==true)
{
return true;
}
else
{
//Get target base & child control.
//Checked/Unchecked all the checkBoxes inside the GridView.
for(var n = 0; n < Inputs.length; ++n)
if(Inputs[n].type == 'checkbox')
Inputs[n].checked = false;
lblValidate.Visible = false;
//Form1.submit(); //Force postback
//return false;
}
else
{
lblValidate.style.display = "";//To display the text(un-hide)
return false; //Used to stop the postback
}
}
/*---------------------

This is the .aspx file:
<%@ Page Language="C#" MasterPageFile="~/AdminBookStore.master" AutoEventWireup="true"
CodeFile="ManageCategoriesPage.aspx.cs" Inherits="ManageCategoriesPage" Title="Manage Categories Page" %>



<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<ajax:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true">

<script type="text/javascript">
/*-----------------------------------------------------------*/
var TotalChkBx;
var Counter;

window.onload = function()
{
//Get total no. of CheckBoxes inside the GridView.
TotalChkBx = parseInt('<%= this.gvManageCategories.Rows.Count %>');
//Get total no. of checked CheckBoxes in side the GridView.
Counter = 0;
}
/*-----------------------------------------------------------*/
function HeaderClick(HCheckBox)
{
//Get target base & child control.
var TargetBaseControl = document.getElementById('<%= this.gvManageCategories.ClientID %>');
var TargetChildControl = "chRowSelect";

//Get all the control of the type INPUT in the base control.
var Inputs = TargetBaseControl.getElementsByTagName("input");

//Checked/Unchecked all the checkBoxes inside the GridView.
for(var n = 0; n < Inputs.length; ++n)
if(Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl,0) >= 0)
Inputs[n].checked = HCheckBox.checked;

//Reset Counter
Counter = HCheckBox.checked ? TotalChkBx : 0;
}
/*-----------------------------------------------------------*/
function ChildClick(RCheckBox, HCheckBox)
{
//get target base & child control.
var HeaderCheckBox = document.getElementById(HCheckBox);
//Modifiy Counter;
if(RCheckBox.checked && Counter < TotalChkBx)
Counter++;
else if(Counter > 0)
Counter--;

//Change state of the header CheckBox.
if(Counter < TotalChkBx)
HeaderCheckBox.checked = false;
else if(Counter == TotalChkBx)
HeaderCheckBox.checked = true;

}
/*-----------------------------------------------------------*/
function bConfirm()
{
var bValidDelete=false;
var lblValidate = document.getElementById('<%= this.lblValidate.ClientID %>');
var TargetBaseControl = document.getElementById('<%= this.gvManageCategories.ClientID %>');
var TargetChildControl = "chRowSelect";

//Get all the control of the type INPUT in the base control.
var Inputs = TargetBaseControl.getElementsByTagName("input");
for(var n = 0; n < Inputs.length; ++n)
if(Inputs[n].type == 'checkbox' && Inputs[n].checked==true)
{
bValidDelete = true;
break;//At least one is checked
}
if(bValidDelete)
if (confirm("Are you sure you want to delete selected categories")==true)
{
return true;
}
else
{
//Get target base & child control.
//Checked/Unchecked all the checkBoxes inside the GridView.
for(var n = 0; n < Inputs.length; ++n)
if(Inputs[n].type == 'checkbox')
Inputs[n].checked = false;
lblValidate.Visible = false;
//Form1.submit(); //Force postback
//return false;
}
else
{
lblValidate.style.display = "";//To display the text(un-hide)
return false; //Used to stop the postback
}
}
/*------------------------------------------------