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

Posted on 2008-06-24
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Last Modified: 2011-09-20
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!
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Question by:4eyesgirl
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jkr earned 500 total points
ID: 21858889
There is nothing in common for most platforms, so you'd probably have to write a wrapper around the OS specific calls regarding the process Id, e.g.
#ifdef WIN32
#include <windows.h>
typedef DWORD PID;
#else
#include <sys/types.h>
#include <unistd.h>
typedef pid_t PID;
#endif
 
PID get_process_id() {
#ifdef WIN32
  return GetCurrentProcessId();
#else
  return getpid();
#endif
}

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Expert Comment

by:jkr
ID: 21858920
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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Author Comment

by:4eyesgirl
ID: 21860612
Do you know if QT provides a portable version so I don't have to do the #ifdef
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LVL 86

Expert Comment

by:jkr
ID: 21860772
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)
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Author Comment

by:4eyesgirl
ID: 21867683
Would pthread_self() works?
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LVL 86

Expert Comment

by:jkr
ID: 21867733
Well, that gives you the 'pthread_t' for the current thread. So, if that is what you want: Yes.
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Author Comment

by:4eyesgirl
ID: 21868285
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?
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Author Comment

by:4eyesgirl
ID: 21868464
can getpid() works on windows?
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