hi 
my program work by 4 thread but when i use more thread it terminates

i use opencv in my image_process.so

my code is : 


#!/usr/bin/python
import sys
import os
import io
import time
import copy
import threading
import ctypes

class MyClass():
    
    def __init__(self):
        i = 0
        while i<10: 
            thread1 = threading.Thread(target=self.item_thread)
            thread1.start()
            i = i+1
            time.sleep(0.01)
        
    def item_thread(self):
        imageAnalyzer=ctypes.CDLL("../so/image_process.so")
        imageAnalyzer.aref_img_score_init("/opt/amniran/etc/face.xml", 
"/opt/amniran/etc/porn.xml")
        for filename in os.listdir("../script/images/"):
            if filename[-4:] == ".jpg" or filename[-4:] == ".png" or 
filename[-4:] == ".gif" or filename[-5:] == ".jpeg"    :
                
                path = "../script/images/%s"%filename
                
                fo = file(path, "r")
                content = fo.read()
                score = imageAnalyzer.score_image(content, len(content))
                print "%d : %s " %(score, path)
        print "ENDDDDDDDDDDDDDDDDDDDDDDDDDDDD"
                

                
                  
   
   
x = MyClass()         
 
 
 
how can i solve this problem 
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