19 多程序學習

import multiprocessing

import time
''''''
def func(msg):
print('msg: ', msg)
time.sleep(1)
print('********')
return 'func_return: %s' % msg
if __name__ == '__main__':
'''pool = multiprocessing.pool(processes=4)
results = 
for i in range(10):
msg = 'hello world %d' % i
for i in results:
i.wait() # 等待程序函式執行完畢
for i in results:
if i.ready(): # 程序函式是否已經啟動了
if i.successful(): # 程序函式是否執行成功
print(i.get()) # 程序函式返回值
''''''
pool = multiprocessing.pool(processes=4)
results = 
for i in range(10):
msg = 'hello world %d' % i
pool.close()
pool.join() # join語句要放在close之後
print(results)
''''''
# map
print('\n--------map------------')
args = [1, 2, 4, 5, 7, 8]
pool = multiprocessing.pool(processes=6)
return_data = pool.map(func, args)
print('阻塞') # 執行完func才執行該句
pool.close()
pool.join() # join語句要放在close之後
print(return_data)
'''# map_async
print('\n--------map_async------------')
pool = multiprocessing.pool(processes=6)
args = [1, 2, 4, 5, 7, 8]
result = pool.map_async(func, args)
print('ready: ', result.ready())
print('不堵塞')
result.wait() # 等待所有程序函式執行完畢
if result.ready(): # 程序函式是否已經啟動了
if result.successful(): # 程序函式是否執行成功
print(result.get()) # 程序函式返回值

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