Python之多线程

 1 #coding=utf-8
 2 
 3 from threading import Thread
 4 import time
 5 
 6 def my_counter():
 7     i = 0
 8     for _ in range(100000000):
 9         i = i + 1
10     return True
11 
12 def main():
13     thread_array = {}
14     start_time = time.time()
15     for tid in range(2):
16         t = Thread(target=my_counter)
17         t.start()
18         # join阻塞下个线程，除非当前线程执行完毕
19         t.join()
20     end_time = time.time()
21     print("Total time: {}".format(end_time - start_time))
22 
23 if __name__ == ‘__main__‘:

 1 #coding=utf-8
 2 
 3 from threading import Thread
 4 import time
 5 
 6 def prn_obj(obj):
 7     return ‘\n‘.join([‘%s:%s‘ % item for item in obj.__dict__.items()])
 8 
 9 def my_counter():
10     i = 0
11     for _ in range(100000000):
12         i = i + 1
13     return True
14 
15 def main():
16     thread_array = {}
17     start_time = time.time()
18     for tid in range(2):
19         t = Thread(target=my_counter)
20         t.start()
21         thread_array[tid] = t
22     for i in range(2):
23         thread_array[i].join()
24         # print("thread type: {}".format(prn_obj(thread_array[i])))
25         print("thread type: {}".format(thread_array[i].name))
26     end_time = time.time()
27     print("Total time: {}".format(end_time - start_time))
28 
29 if __name__ == ‘__main__‘:
30     main()

import os
if __name__==‘__main__‘: 
    print ‘Process (%s) start...‘ % os.getpid()
    pid = os.fork()
    print pid
    if pid==0:
            print ‘I am child process (%s) and my parent is %s.‘ % (os.getpid(), os.getppid())
    else:
            print ‘I (%s) just created a child process (%s).‘ % (os.getpid(), pid)