Question

目前我在主流程下创建了3个流程A，B，C。但是，我想在流程A中启动B和C.这可能吗？

process.py

from multiprocessing import Process

procs = {}
import time

def test():
    print(procs)
    procs['B'].start()
    procs['C'].start()
    time.sleep(8)

    procs['B'].terminate()
    procs['C'].termiante()

    procs['B'].join()
    procs['C'].join()




def B():
    while True:
        print('+'*10)
        time.sleep(1)
def C():
    while True:
        print('-'*10)
        time.sleep(1)


procs['A'] = Process(target = test)
procs['B'] = Process(target = B)
procs['C'] = Process(target = C)

main.py

from process import *
print(procs)
procs['A'].start()
procs['A'].join()

我得到了错误 AssertionError：只能启动当前进程创建的进程对象

有没有其他方法可以在A中启动流程B和C？或者让A发送信号询问主进程启动B和C

Answer 1

我建议使用@graph.get_object("me", { fields: [:id, :email, :first_name, :gender, :last_name, :link, :locale, :name, :timezone, :updated_time, :verified]})个对象来进行同步。它们允许在整个过程中触发一些操作。例如

Event

请注意，此代码并不是很干净。在这种情况下，只需要一个事件。但是你应该得到主要的想法。

此外，不再需要进程from multiprocessing import Process, Event import time procs = {} def test(): print(procs) # Will let the main process know that it needs # to start the subprocesses procs['B'][1].set() procs['C'][1].set() time.sleep(3) # This will trigger the shutdown of the subprocess # This is cleaner than using terminate as it allows # you to clean up the processes if needed. procs['B'][1].set() procs['C'][1].set() def B(): # Event will be set once again when this process # needs to finish event = procs["B"][1] event.clear() while not event.is_set(): print('+' * 10) time.sleep(1) def C(): # Event will be set once again when this process # needs to finish event = procs["C"][1] event.clear() while not event.is_set(): print('-' * 10) time.sleep(1) if __name__ == '__main__': procs['A'] = (Process(target=test), None) procs['B'] = (Process(target=B), Event()) procs['C'] = (Process(target=C), Event()) procs['A'][0].start() # Wait for events to be set before starting the subprocess procs['B'][1].wait() procs['B'][0].start() procs['C'][1].wait() procs['C'][0].start() # Join all the subprocess in the process that created them. procs['A'][0].join() procs['B'][0].join() procs['C'][0].join()，您可以考虑使用回调。例如，如果要链接某些异步操作，请参阅A模块。

AssertionError：只能启动当前进程创建的进程对象

1 个答案: