python 多线程 thread 加锁（二）

thread.start_new_thread(function,args[,kwargs])函数原型，其中function参数是你将要调用的线程函数名称没有括号；
args是讲传递给你的线程函数的参数，他必须是个tuple类型；而kwargs是可选的参数，如果没有参数，也一定是()

import thread
from time import sleep
from time import ctime

loops = [2,4]

def loop(nloop, nsec, lock):
    print 'start loop', nloop, 'at:', ctime()
    sleep(nsec)
    print 'end loop', nloop, 'at:', ctime()
    lock.release()

def main():
    print 'start main at:', ctime()
    locks = []
    nloops = range(len(loops))

    for i in nloops:
        lock = thread.allocate_lock()
        lock.acquire()
        locks.append(lock)

    for i in nloops:
        thread.start_new_thread(loop, (i,loops[i], locks[i]))

    for i in nloops:
        while locks[i].locked():
            pass

    print 'end all at:', ctime()

if __name__ == '__main__':
    main()

运行结果：
start main at: Sat May 07 11:17:43 2016
start loop 0 at:start loop Sat May 07 11:17:43 20161
at: Sat May 07 11:17:43 2016
end loop 0 at: Sat May 07 11:17:45 2016
end loop 1 at: Sat May 07 11:17:47 2016
end all at: Sat May 07 11:17:47 2016