进程&线程

Python

from multiprocessing import Process
import os
def run_proc(name):
    print("Run child process %s (%s)..." %(name, os.getpid()))
if __name__ == '__main__':
    print("Parent process %s." % os.getpid())
    p=Process(targent=run_proc, args=('test',))
    print('Child process will start.')
    p.start()  #启动
    p.join()   #等待子进程结束后再继续往下运行
    print("Child process end.")

from multiprocessing import Pool
import os, time, random
def long_time_task(name):
    print("Run task %s (%s)..." % name, os.getpid()))
    start=time.time()
    time.sleep(random.random()*3)
    end=time.time()
    print("Task %s runs %0.2f seconds." % (name, (end-start)))
if __name__ == "__main__":
    print("Parent process %s." % os.getpid())
    p = Pool(4)
    for i in range(5):
        p.apply_async(long_time_task, args=(i,))