Embed python interpreter in multi-threaded c++ application

[yslee]

This is my Python script (test.py) :
=====================================
test.py
=====================================
import time, sys
name=sys.argv[0]
id=sys.argv[1]
i=0
delay=int(id)
while i<10:
    print name, id, i
    i=i+1
    time.sleep(delay)
=====================================
end of test.py
=====================================

In the following simple C++ test program (test.cpp), I'm creating 3 threads
each will run the above script.
=====================================================
test.cpp
=====================================================
#include "stdafx.h"
#include "python.h"

DWORD WINAPI MyThreadProc(LPVOID lpParameter)
{
 if (Py_NewInterpreter()==NULL)
  printf("Fails to create new sub interpreter (%d)\n", (int)lpParameter);

 FILE* fp;
 char *argv[2];
 argv[0]="d:\\projects\\python\\test\\test.py";
 char temp[256];
 sprintf(temp, "%d", (int)lpParameter);
 argv[1]=temp;
 PySys_SetArgv(2, argv);

 if( (fp  = fopen( "test.py", "r" )) == NULL )
  printf( "The file 'test.py' was not opened (%d)\n", (int)lpParameter);
 else
  printf( "The file 'test.py' was opened (%d)\n", (int)lpParameter);

 if (PyRun_SimpleFile(fp, "d:\\projects\\python\\test\\test.py")!=0)
  printf("PyRun_SimpleFile fails (%d)\n", (int)lpParameter);

 printf("thread (%d) exiting\n", (int)lpParameter);

 return(0);
}

int main(int argc, char* argv[])
{
 Py_Initialize();
 PyEval_InitThreads();

 printf("Hello World!\n");
 DWORD id;
 for (int i=1;i<4;i++)
  CreateThread(NULL, 0, MyThreadProc, (LPVOID)i, 0, &id);

 getch();
 Py_Finalize();
 return 0;
}
======================================================
end of test.cpp
======================================================


The script in thread 1 will print 1 to 10 at an interval of 1 second, 2
second for thread 2, 3 second for thread 3.  Therefore script in thread 1
will end first (i.e. after 10 seconds).  My problem is : right after thread
1 exits, the script in thread 2 and 3 will stop executing in the middle.
What have I done wrong?


YS Lee
C/C++ Software Developer