Solved

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

Posted on 2008-06-24
8
840 Views
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!
0
Comment
Question by:4eyesgirl
  • 4
  • 4
8 Comments
 
LVL 86

Accepted Solution

by:
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
}

Open in new window

0
 
LVL 86

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);
}

Open in new window

0
 

Author Comment

by:4eyesgirl
ID: 21860612
Do you know if QT provides a portable version so I don't have to do the #ifdef
0
Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

 
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)
0
 

Author Comment

by:4eyesgirl
ID: 21867683
Would pthread_self() works?
0
 
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.
0
 

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?
0
 

Author Comment

by:4eyesgirl
ID: 21868464
can getpid() works on windows?
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more …
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

805 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question