*topic

//Thank you @MissRose_bot

/get cppbookguide

if i have a dynamic array of classes, what's the best way to add a new class to that array?

if i have a dynamic array of classes, what's the best way to add a new class to that array?

Array of objects of a specific class? Like this? std::vector<MyClass> myVector; You can use push_back or emplace_back for example to add to the end of it.

I am not very good at c++ yet, now i have sth like this: Class *sth = new Class[10] and i want to get the size to 11

I am not very good at c++ yet, now i have sth like this: Class *sth = new Class[10] and i want to get the size to 11

Is it necessary to use C-style arrays? Why not use std::vector?

You need to reallocate the memory for size 11

Seems like i have no other choice that to go and learn what exactly is std::vector

You need to reallocate the memory for size 11

some ppl on github said it is bad using realloc for classes in c++, i dont want to test it XD

Seems like i have no other choice that to go and learn what exactly is std::vector

You're right

some ppl on github said it is bad using realloc for classes in c++, i dont want to test it XD

That's true, for a generic case you would need to allocate a new array and move every object there. Then to avoid extra constructor call, you would probably need to allocate raw memory instead of using arrays and manually construct and destruct objects there. Then to fight with the extra cost of allocations and movement, you would want to preallocate some memory in advance and store two sizes: allocated and used. Well, or use std::vector that does all that stuff for you :)

i hate signal races

Guys how can i get a free usa number help

Hello

Guys I have c++ exam Please someone help so urgent

Lmao we ain't going to solve your exam for you

If you've got any more specific questions, and some of us have free time, we may consider answering

Hello everyone

Hello

Guys i have ( programming skill) mock exam today.please Can u guys help me ? B'coz i am new student

Do your exam yourself.

Seriously? . I have no knowledge about programming . So i applied pvt campus .

Seriously? . I have no knowledge about programming . So i applied pvt campus .

If you have no knowledge, then you can't pass the exam. It is really that simple.

Thats why i want to pass and I'm trying to do that course

I don't want to argue . If there is anyone who can help me. Please

I don't want to argue . If there is anyone who can help me. Please

It is perfectly legal to ask for help for study. Especially specific part that you do not understand. But if what you ask is help in your exam, then it is academic dishonesty. Only people who understand the material should pass the exam.

I need someone to make a soft , If you have free time dm so I can explain what I exactly need ....

It is perfectly legal to ask for help for study. Especially specific part that you do not understand. But if what you ask is help in your exam, then it is academic dishonesty. Only people who understand the material should pass the exam.

You 're right because you do not understand my situation :).They select people who have studied IT. I did not do that subject. But I passed other subjects very well. That is why I have passed that examination. Need to learn programming. But anyway thanks for the reply

You 're right because you do not understand my situation :).They select people who have studied IT. I did not do that subject. But I passed other subjects very well. That is why I have passed that examination. Need to learn programming. But anyway thanks for the reply

Which country?

Which country?

from LK

Thnx

*Sri Lanka

i hate signal races

Signal races? Do you mean a race condition on a global structure because of an asynchronous signal handler?

/report

Fact but not the group for it.

Signal races? Do you mean a race condition on a global structure because of an asynchronous signal handler?

no, like process signal races, eg kill(pid, signal), waitpid(pid, &status, flags)

https://gist.github.com/Total-Control-9985/7dafc08de8231a544c8c19853cb19c4f

no, like process signal races, eg kill(pid, signal), waitpid(pid, &status, flags)

where's the race? waitpid doesn't send a signal

no, like process signal races, eg kill(pid, signal), waitpid(pid, &status, flags)

Why do you hate it?

ok, it is an issue with my join thread...

ok i have another race i need to figure out

by the time i send the SIGCONT and i wait for my process to change state to CONTINUE it may already have continued and exited before waitpid is called

/report

/report as bhakt

Fact but not the group for it.

Just Tp , ....!!

CASE STOPPED CONTINUE THREAD: 265096 EXITING waiting for CONTINUE pid 265096 WAIT TERMINATED CASE DEFAULT WAIT CASE TERMINATED JOINED

by the time i send the SIGCONT and i wait for my process to change state to CONTINUE it may already have continued and exited before waitpid is called

and is it a problem if it exited? if so you can check if it exited before continuing yourself

which, if fast enough, this can happen CONTINUE THREAD: 265485 EXITING waiting for CONTINUE pid 265485 WAIT TERMINATED JOINED

which, if fast enough, this can happen CONTINUE THREAD: 265485 EXITING waiting for CONTINUE pid 265485 WAIT TERMINATED JOINED

I thought you mean Propotional, integral and derivative when you said "PID loop"...

and i got another bug wait_for_state (pid 266027): unknown wait while waiting for state: CONTINUE

A proportional–integral–derivative controller (PID controller or three-term controller) is a control loop mechanism employing feedback that is widely used in industrial control systems and a variety of other applications requiring continuously modulated control. A PID controller continuously calculates an error value.

I thought you mean Propotional, integral and derivative when you said "PID loop"...

haha

A proportional–integral–derivative controller (PID controller or three-term controller) is a control loop mechanism employing feedback that is widely used in industrial control systems and a variety of other applications requiring continuously modulated control. A PID controller continuously calculates an error value.

nice

and i think the cause is this LOG_INFO("CONTINUE THREAD: %d", thread->pid.load()); thread->status = Thread::StatusList::RUNNING; sendSignal(thread, SIGCONT); if (getpid() != thread->pid) { LOG_INFO("WAITING FOR CONTINUE THREAD: %d", thread->pid.load()); waitForContinue(thread); LOG_INFO("WAITED FOR CONTINUE THREAD: %d", thread->pid.load()); } CONTINUE THREAD: 267012 boo! STOP THREAD: 267012 WAITING FOR CONTINUE THREAD: 267012 wait_for_state (pid 267011): unknown wait while waiting for state: CONTINUE

/report as bhakt

What😂?

which is another signal race

bloody signal races :(

but now i have a problem, waitForContinue(Thread * thread) CANNOT be used to wait for a STOP since it is meant to send SIGCONT to the program and then wait for the program to be delivered SIGCONT

as the program MAY do this: Prog1: kill(pid, SIGCONT); SCHED SWITCH Prog2 RECV SIGCONT Prog2: kill(self, SIGSTOP); Prog2 RECV SIGSTOP SCHED SWITCH Prog1: waitpid(pid, &status, WCONTINUED|WSTOPPED); /* check status for continue or termination */

/report as bhakt

As what?

as the program MAY do this: Prog1: kill(pid, SIGCONT); SCHED SWITCH Prog2 RECV SIGCONT Prog2: kill(self, SIGSTOP); Prog2 RECV SIGSTOP SCHED SWITCH Prog1: waitpid(pid, &status, WCONTINUED|WSTOPPED); /* check status for continue or termination */

I don't remember if you mentioned, but what are you working on? Is it some kind of OS or something embedded?

I don't remember if you mentioned, but what are you working on? Is it some kind of OS or something embedded?

im working on a thread manager

eg https://gist.github.com/Total-Control-9985/94919d165d43f908560fdbb3f795715e

Guys I have c++ exam Please someone help so urgent

How much would you pay?

I don't want to argue . If there is anyone who can help me. Please

Sure, how much?

would i need to do this? https://gist.github.com/66bf4cd559b1b4b36261bc68cbc838d0

welp that helps but it is still not enough

STOP THREAD AND WAIT FOR CONTINUE: 272642 CONTINUE THREAD: 272642 boo! STOP THREAD AND WAIT FOR CONTINUE: 272642 wait_for_state (pid 272641): unknown wait while waiting for state: CONTINUE

think it is cus of this LOG_INFO("CONTINUE THREAD: %d", thread_pid); thread->status = Thread::StatusList::RUNNING; sendSignal(thread_pid, thread, SIGCONT); waitForContinue(thread); // we are sending a signal to ourself, so we must exist, no need to check for error kill(pid, SIGSTOP); // self cannot wait for SIGCONT since we are already in a continued state when kill returns while (thread->status != Thread::StatusList::RUNNING);

Anyone guide me about Oops after 15 days I have exams but I will not able to perform good in these exams

Anyone

Anyone

search the Internet.

#cbook

search the Internet.

😭

/report

made a little script that continuously executes a command until output is matched and then outputs the entire output of that command if [[ $# < 2 ]] then echo "usage: $(basename $0) \"output to match against\" command <optional args>" fi string="$1" shift 1 cmd="$@" while true do rm UNTILLOUTPUTMATCHESEOF.txt > /dev/null 2>&1 script --flush --quiet --command "$cmd" UNTILLOUTPUTMATCHESEOF.txt # cmd might hang grep -q "$string" UNTILLOUTPUTMATCHESEOF.txt if [[ $? == 0 ]] then cat UNTILLOUTPUTMATCHESEOF.txt rm UNTILLOUTPUTMATCHESEOF.txt exit fi done

cus i dont wanna keep pressing up enter on my keyboard to try to find any bugs

Can someone explain what`s wrong

thread th1(LorisThread, s, socket_address);

void LorisThread(SOCKET s, sockaddr_in* socket_address) {

use a paste site