creating POSIX threads in UNIX

Code:

---

#include <pthread.h>
#include <iostream>
using namespace std;


void myfunc()
{
        cout<<"hello"<<endl;
}
int main()
{

        pthread_t *thread1;
        thread1 = (pthread_t*)calloc(1,sizeof(pthread_t));
        pthread_create(thread1,NULL,(void *)(&myfunc),NULL);
        return 0;
}

---

when i try to run get an error saying: main.cpp:15: error: invalid conversion from `void*' to `void*(*)(void*). This is just to test to see that i can create a thread to simualte a producer/consumer threads.

Give this a try:

Code:

---

#include <pthread.h>
#include <iostream>
using namespace std;


void* myfunc(void *param)
{
        cout<<"hello"<<endl;
}
int main()
{

        pthread_t *thread1;
        thread1 = (pthread_t*)calloc(1,sizeof(pthread_t));
        pthread_create(thread1,NULL,myfunc,NULL);
        return 0;
}

---

Code:

---

  #include <pthread.h>
  #include <iostream>
  using namespace std;
 
  void *myfunc(void *data)
  {
  cout<<"hello"<<endl;
  }
  int main()
  {
 
          pthread_t *thread1;
          thread1 = (pthread_t*)calloc(1,sizeof(pthread_t));
          pthread_create(thread1, NULL, myfunc, NULL);
          return 0;
  }

---

(edit) next time I'll leave the colors away to be faster°°

when i execute that code i get a: Segmentation fault (core dumped)

You get a seg fault because your main thread ends before your spawned thread.
Give this a try:

Code:

---

void* myfunc(void *param)
{
  cout<<"hello"<<endl;
  return 0;
}
int main()
{
  pthread_t thread1;
  pthread_create(&thread1,NULL,myfunc,NULL);
  pthread_join(thread1,0);
  return 0;
}

---

The pthread_join() function tells the main thread to wait for the spawned thread to end before continuing.

i tried doing that, now it gives me a /var/tmp//ccjC6FRg.o(.text+0x62): In function `main':
: undefined reference to `pthread_join'

I have #include<pthread.h>

You have to link to the pthread library. Pass -lpthread to your linker.