// C++ program to find memory conflicts among threads
#include<bits/stdc++.h>
using namespace std;
/* Shows structure for details of thread */
struct Thread{
int id1, memblck1, time1;
char access1;
};
/* Here, compare function needed for sorting threads
We first sort threads on the basis of memory block,
If they are same, then we sort on the basis of time */
bool compare(const Thread& x1, const Thread& y1){
if (x1.memblck1 == y1.memblck1)
return x1.time1 < y1.time1;
else return x1.memblck1 < y1.memblck1;
}
// Shows function to print all conflicts among threads
void printConflicts(Thread arr1[], int n1){
/* Used to sort the threads first by memblock, then by
time */
sort(arr1, arr1+n1, compare);
/*Perform starting from second thread till last thread*/
for (int i = 1; i < n1; i++){
/* Because threads are sorted, We verify further
for conflict possibility only if there
memblock is same*/
if(arr1[i].memblck1 == arr1[i-1].memblck1){
/* Because threads with same block are sorted in
increasing order of access time. So we verify possibility conflict
from last thread to all previous threads which access the same block
of memory such that the current thread access under the arr1[i-
1].time1 + 5.. and if any of them does read operation than conflict
occurs at any point memblock1 becomes different or current thread
moves out of vulnerable time of latest previous processed thread,
the loop breaks. */
if (arr1[i].time1 <= arr1[i-1].time1+5){
int j = i-1; /* Perform starting with previous
thread */
// Determine all previous conflicting threads
while (arr1[i].memblck1 == arr1[j].memblck1 &&
arr1[i].time1 <= arr1[j].time1+5 &&
j >= 0){
if (arr1[i].access1 == 'W' || arr1[j].access1 =='W'){
cout << "Threads " << arr1[j].id1 << " and "
<< arr1[i].id1 << " conflict.\n";
}
j--;
}
}
}
}
cout << "All other operations are safe\n";
}
// Driver program to test above function
int main(){
Thread arr1[] = { {1, 932, 1, 'R'}, {2, 512, 2, 'W'},
{3, 932, 3, 'R'}, {4, 512, 4, 'R'},
{5, 432, 5, 'R'}, {6, 512, 6, 'R'},
{7, 835, 7, 'W'}, {8, 432, 8, 'R'}
};
int n1 = sizeof(arr1)/sizeof(arr1[0]);
printConflicts(arr1, n1);
return 0;
}
About Online C++ Compiler
Try our Online C++ Compiler (Version GNU GCC v11.3.0) to Edit, Run, and Share your C++ Code directly from your browser. This online development environment provides you the latest version GNU GCC v11.3.0.
How to use Online C++ Compiler?
Write and Execute Code
- Write your program (or, paste it) directly under the "Source Code" tab.
- If you want to save your program, go to the "Project" menu and save it.
- You can directly execute your program without saving it by clicking on on "Execute" button.
User Input
The latest version of Coding Ground allows to provide program input at run time from the termnial window exactly the same way as you run your program at your own computer. So simply run a program and provide your program input (if any) from the terminal window available in the right side.
Online C++ Compiler: Keyboard Shortcuts
The following are the keyword shortcut of this Online C++ Compiler:
Shortcut | Description |
⌘ + Enter | Run the program |
⌘ + S | Save Project (Login Required) |
⇧ + ⌘ + S | Save As Project |
⌘ + P | New Project |
⌘ + G | Share Project |
⌘ + Z | Undo Editing |
⌘ + Y | Redo Editing |
⌘ + A | Select All Text |
⌘ + X | Cut Selected Text |
⌘ + C | Copy Selected Text |
⌘ + V | Paste Copied Text |
⌘ + F | Search Text |
⌘ + ⌥ + F | Replace Text |
Shortcut | Description |
Ctrl + Enter | Run the program |
Ctrl + S | Save Project |
Shift + Ctrl + S | Save As Project |
Ctrl + G | Share Project |
Ctrl + Z | Undo Editing |
Ctrl + Y | Redo Editing |
Ctrl + A | Select All Text |
Ctrl + X | Cut Selected Text |
Ctrl + C | Copy Selected Text |
Ctrl + V | Paste Copied Text |
Ctrl + F | Search Text |
Ctrl + H | Replace Text |
Online C++ Compiler: Save and Share C++ Code (Project)
Save C++ Project Online
You can save your C++ Project with us so that you can access this project later on. To save a project you will need to create a login Id with us. So before you save a project, please create a login Id using a link given at the top right corner of this page.
Share C++ Project Online
You can use this feature to share your C++ Code with your teachers, classmates and colleagues. Just click Share Button and it will create a short link, which can be shared through Email, WhatsApp or even through Social Media. A shared link will be deleted if it has been passive for almost 3 months.
More Features of Online C++ Compiler
- Theme – You can change the current editor's theme from the "Editor Theme" option under "Settings" menu.
- Font Size – You can change the font size of the editor /compiler from from the "Font Size" option under "Settings" menu.
- Tab Size – You can change the tab size from the "Tab Size" option under "Settings" Menu.
- Show/Hide Line Numbers – You can show/hide the line number with the code from the "Show Line Numbers" or "Hide Line Numbers" option under "Settings" Menu.
- And, many more.
Benefits of Using Online C++ Compiler
There are several benefits of using the Online C++ Compiler to run your C++ code:
- Platform independence: You can run your code from any device without taking care of operating systems.
- Convenience: You don't need to install anything for using this.
- No setup required: There is no need for additional setup to run your code.
- Updated version: Our online compiler/editors/terminals are the latest up-to-date.