How to initialized pthread_t variable in class constructor - c++

Question

How to initialized pthread_t variable in class constructor.
C++ Static Analysis(coverity) Error: Non-static class member threadId is not initialized in this constructor nor in any functions that it calls.
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
void *
threadFunc(void * arg)
{
std::cout << "Thread Function :: Start" << std::endl;
// Sleep for 2 seconds
sleep(2);
std::cout << "Thread Function :: End" << std::endl;
return NULL;
}
class threads
{
private:
pthread_t threadId;
int err;
public:
threads():err(0){};
~threads(){};
void create_thread();
void join_thread();
};
void
threads::create_thread()
{
// Create a thread that will function threadFunc()
err = pthread_create(&threadId, NULL, &threadFunc, NULL);
// Check if thread is created sucessfuly
if (err)
{
std::cout << "Thread creation failed : " << strerror(err);
}
else
{
std::cout << "Thread Created with ID : " << threadId << std::endl;
}
}
void
threads::join_thread()
{
err = pthread_join(threadId, NULL);
// check if joining is sucessful
if (err)
{
std::cout << "Failed to join Thread : " << strerror(err) << std::endl;
}
}
int main()
{
threads T;
T.create_thread();
T.join_thread();
std::cout << "Exiting Main" << std::endl;
return 0;
}
Note:
I have checked all existing questions and answer in Stackoverflow.
But none of them have clear answer.
The above c++ code is a sample code(copied from Internet and updated to show my actual problem)

Answer 1

I have tried this and its working (Posting the answer, to help others)
#include <iostream>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
void *
threadFunc(void * arg)
{
std::cout << "Thread Function :: Start" << std::endl;
// Sleep for 2 seconds
sleep(2);
std::cout << "Thread Function :: End" << std::endl;
return NULL;
}
class threads
{
private:
pthread_t threadId;
int err;
public:
threads():err(0){ threadId = pthread_t(); std::cout <<threadId<<std::endl;};
~threads(){};
void create_thread();
void join_thread();
};
void
threads::create_thread()
{
// Create a thread that will function threadFunc()
err = pthread_create(&threadId, NULL, &threadFunc, NULL);
// Check if thread is created sucessfuly
if (err)
{
std::cout << "Thread creation failed : " << strerror(err);
}
else
{
std::cout << "Thread Created with ID : " << threadId << std::endl;
}
}
void
threads::join_thread()
{
err = pthread_join(threadId, NULL);
// check if joining is sucessful
if (err)
{
std::cout << "Failed to join Thread : " << strerror(err) << std::endl;
}
}
int main()
{
threads T;
T.create_thread();
T.join_thread();
std::cout << "Exiting Main" << std::endl;
return 0;
}