Question

我正在尝试一个接一个地运行两个命令。我的代码如下：

baking.bake()
print "baking completed"

我的目标是运行baking.bake()（大约需要1分钟才能完成），然后立即打印“烘焙开始”。最后，当烘焙完成后，我想打印“烘焙完成”。实质上：我如何异步运行bake()？

这是我的backing.py文件

# Bake a texture map
from cgkit.cmds import load, worldObject, listWorld
from cgkit.rmshader import RMMaterial, RMShader
from cgkit.sceneglobals import Globals



def bake():
        Globals(
            bake = True,
            resolution = (512, 512),
            pixelsamples = (2,2),
            output = "ao_map.tif",
            displaymode = "rgba"
        )

        # Load the model
        load("singleSofa.obj")
        # Obtain a reference to the model
        model = worldObject("small_sofa_dark_grey")

        # Set the bake material
        mat = RMMaterial(
            surface = RMShader(
                "bake_ao.sl",
                samples = 1000,
            )
        )

        model.setMaterial(mat)

Answer 1

您可以使用multiprocessing module，如下所示：

from multiprocessing import Pool
import time

def something(i):
    time.sleep(2)
    return i+i

pool = Pool(processes=1)
res = pool.apply_async(something, [2])
print "Started something, waiting..."
# ...
print "Done with something. Result was: %s" % (res.get())

因此，在您的方案中，我们可以执行以下操作：

from multiprocessing import Pool

# Create baking object and so forth.
# ...

pool = Pool(processes=1)
res = pool.apply_async(baking.bake)
print "Baking started"

# Then we do something while we wait...

res.get()
print "Baking done."

Answer 2

基本上你会使用threading模块及其join方法：

import threading    

def print_hello():
    for _ in range(3):
        print 'Hello'

hello_thread = threading.Thread(target=print_hello)
hello_thread.start()
hello_thread.join()

print "We're done!"

此代码将打印：

您好

您好

您好

我们已经完成了！

所以在你的情况下你会创建一个线程：

bake_thread = threading.Thread(target=baking.bake)

然后只需start线程，join即可。

如何在python中一个接一个地运行两个进程

2 个答案: