[英]Run concurrent processes in same class with multiprocessing library
我需要與“多處理”庫並行運行多個類函數,但我無法找到針對我的特定問題的指南或答案。 我的問題是只有第一個進程正在啟動(或正在運行,我不知道這里的確切區別)。
為了說明這個問題,我設置了以下示例:
import multiprocessing
import time
class parallel_printer(multiprocessing.Process):
def __init__(self, freq_0, freq_1, freq_2):
self.freq_0 = freq_0
self.freq_1 = freq_1
self.freq_2 = freq_2
def print_0(self):
while True:
now = time.localtime()
if now.tm_sec % self.freq_0 == 0:
print('printer 0')
time.sleep(1.0)
def print_1(self):
while True:
now = time.localtime()
if now.tm_sec % self.freq_1 == 0:
print('printer 1')
time.sleep(1.0)
def print_2(self):
while True:
now = time.localtime()
if now.tm_sec % self.freq_2 == 0:
print('printer 2')
time.sleep(1.0)
def start_printer(self):
p_0 = multiprocessing.Process(target = self.print_0())
p_1 = multiprocessing.Process(target = self.print_1())
p_2 = multiprocessing.Process(target = self.print_2())
p_0.start()
p_1.start()
p_2.start()
class Tester(object):
def __init__(self):
self.freq_0 = 3
self.freq_1 = 7
self.freq_2 = 11
self.parallel_printer = parallel_printer(self.freq_0, self.freq_1, self.freq_2)
def start_Tester(self):
self.parallel_printer.start_printer()
if __name__ == '__main__':
tester = Tester()
tester.start_Tester()
正如您可以在multiprocessing.Process
的 Python 文檔中閱讀的那樣,您需要為target
參數傳遞“調用對象”。
您的代碼應如下所示:
p_0 = multiprocessing.Process(target=self.print_0)
p_1 = multiprocessing.Process(target=self.print_1)
p_2 = multiprocessing.Process(target=self.print_2)
如果您編寫self.print_0()
而不是self.print_0
,則您不會像應該做的那樣傳遞調用對象,而是調用函數並傳遞返回值。
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