how can i use python multiprocessing module to run matalb engine for each process?

I'm trying to run matlab function within a python program through matlab engine in MacOS. when i run matlab engine without multiprocessing module, it runs quite well; when i run matlab engine with multiprocessing module like below, the matlab process status from running to sleeping, and never change. code:

class Demo():

    def antDemo(self, lock, alive, ready):
        print "now"
        current = os.getcwd()
        aissig = os.path.join(current, './AISSig')
        os.chdir('../singleantv2.0.1/')
        print "current pwd is %s" % os.getcwd()
        print ready, alive
        eng = matlab.engine.start_matlab()
        print alive
        while(alive):
            lock.acquire()
            file_name = alive[0]
            del alive[0]
            ready.append(file_name)
            lock.release()
            print file_name
            if file_name == '.' or file_name == '..' or file_name == '.DS_Store':
                continue
            sigpath = os.path.join(aissig, file_name)
            eng.Main(sigpath)
        eng.quit()
        os.chdir('../devops/')

    def test1(self, lock, alive, ready):
        print "start"
        eng1 = matlab.engine.start_matlab()
        eng1.quit()
        print "end"

    def test2(self, lock, alive, ready):
        print "start"
        eng2 = matlab1.engine.start_matlab()
        eng2.quit()
        print "end"
demo = Demo()
def multiproc():

    file_list = os.listdir('./AISSig')
    alive = file_list
    ready = []
    lock = multiprocessing.Lock()
    #proc1 = multiprocessing.Process(target = self.antDemo, args = (lock, alive, ready))
    #proc2 = multiprocessing.Process(target = self.antDemo, args = (lock, alive, ready))
    #proc3 = Process(target = self.test1, args = (lock, alive, ready))
    proc4 = multiprocessing.Process(target = demo.test2, args = (lock, alive, ready))
    proc4.daemon = True
    print proc4.is_alive()
    #proc1.start()
    #proc2.start()
    #proc3.start()
    proc4.start()
    proc4.join()
    print "hello"

Is there something wrong?

[Catherine Wong]

Did you end up finding a solution? I have a similar problem when using mulitprocessing with MATLAB and MATLAB is stuck when I access eng.workspace.

[Jun-Yi Tsai]

I've faced the similar problems. there is no return and stuck during the multiprocessing module. I found a possible solution from the Matlabe website which shows the Limitations to Python Support

"Modules that start MATLAB in a separate process, for example, the multiprocessing module."

I Think this might be the reason why I cannot use this to do the multiprocessing with matlab engine.

[Mohammad Sami]

What is your matlab version.

The current version does support starting of multiple instances of the engine.

https://www.mathworks.com/help/matlab/matlab_external/start-the-matlab-engine-for-python.html

[Ze Wei Ng]

I belive OP was talking about multiprocessing rather than starting multiple instances

Does anyone have a workaround?