C++ thread error: no type named ‘type’ MINGW

I'm currently doing a project for my operational systems class and I have to make a program to find prime numbers to run in threads.

So I did this:

#include <iostream>
#include <cmath>
#include <thread>
#define THREADNUMBER 100
using namespace std;


int CONTADOR = 0;
int CONTADORTHREADEXECUTADA = 0;
int primeRange(int v1, int v2) {
int a, limit;
bool isprime;

for (int i = v1; i <= v2; i++) {
if (i % 2 != 0 && i % 3 != 0) {
isprime = true;
limit = i / 2;
if(i == 1) isprime =false;


limit = (int)sqrt(i); //General case

for(a=2; a <= limit; a++){
if(i % i == 0 && i != 2){
isprime = false;
break;
}
}
if (isprime) {
CONTADOR++;
}

}
}
CONTADORTHREADEXECUTADA++;
return 1;
}
int main(int argc, char *argv[ ] ) {
int number1 = atoi(argv[1]);
int number2 = atoi(argv[2]);
int dif = number2-number1;
thread** vec = new thread*[THREADNUMBER];
cout<< "criando threads" <<endl;
int contadorthread = 0;
if (dif <= THREADNUMBER) {
for(int i = number1; i <= number2; i++) {
thread* t = new thread(primeRange(i,i));
vec[contadorthread] = t;
contadorthread++;
}
} else {
int c = dif / THREADNUMBER;

for(int i = number1; i <= number2; i+=(c+1)) {
if (contadorthread==THREADNUMBER-1) {
thread* t = new thread(primeRange(i,number2));
vec[contadorthread] = t;
contadorthread++;
break;
}
thread* t = new thread(primeRange(i,i+c));
vec[contadorthread] = t;
contadorthread++;

}
cout<<contadorthread << " threads criadas"<<endl;
cout<<"inicializando threads" <<endl;

while (CONTADORTHREADEXECUTADA < contadorthread) {
cout<<contadorthread - CONTADORTHREADEXECUTADA << endl;
}
cout<< CONTADOR << "primos encontrados" <<endl;
}
}


But everytime I try to compile on 64 windows GCC I get this error message saying that there is not type named 'type'

I compile with this

g++ -Wall -g -std=c++11 -pthread codigo.cpp -o exe -Wall


What can I do?
I already downloaded the version of mingw they say is thread safe.

new

std::thread

std::vector

std::thread

packaged_task

async

1 Answer
1

The statement

thread* t = new thread(primeRange(i,i));


call function primeRange and pass result(int) to thread constructor which is obviously not the way to call. Instead use:

thread* t = new thread(primeRange, i, i);


It will pass function pointer as well as arguments to thread constructor.

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