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Need a portable version of GetThreadId and GetProcessId to retrieve Process and Thread Id

Hi expert,

I need to retrieve the current Process and Thread Id information. GetThreadId and GetProcessId is for windows only? I need a system call that can portable to all platform. Does QT has functions to do that?

I am using QT3.3.3. Thanks!

ASKER CERTIFIED SOLUTION

jkr

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jkr

As for the thread Ids - I remember you're using pthreads, you can assign your own Ids like in the sample below. pthreads is portable anyway, so you don't have to care about that.

#include <pthread.h>
#include <stdio.h>
#define NUM_THREADS     5
 
void *PrintHello(void *threadid)
{
   int tid;
   tid = (int)threadid;
   printf("Hello World! It's me, thread #%d!\n", tid);
   pthread_exit(NULL);
}
 
int main (int argc, char *argv[])
{
   pthread_t threads[NUM_THREADS];
   int rc, t;
   for(t=0; t<NUM_THREADS; t++){
      printf("In main: creating thread %d\n", t);
      rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);
      if (rc){
         printf("ERROR; return code from pthread_create() is %d\n", rc);
         exit(-1);
      }
   }
   pthread_exit(NULL);
}

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4eyesgirl

ASKER

Do you know if QT provides a portable version so I don't have to do the #ifdef

jkr

No, checked it and found nothing - neither QApplication nor QThread have any members regarding that issue. Anyway, it's just in a single place ;o)

4eyesgirl

ASKER

Would pthread_self() works?

jkr

Well, that gives you the 'pthread_t' for the current thread. So, if that is what you want: Yes.

4eyesgirl

ASKER

When I do the following, it prints out hex instead of dec

psthread_t pth_id = psthread_self();
std::cout << pth_id;

How to convert it to dec on all platforms?

4eyesgirl

ASKER

can getpid() works on windows?