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multiprocess.py
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multiprocess.py
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from multiprocessing import Process, Lock, Pool
import os
import sys
sys.path.append(os.path.dirname(os.path.abspath(__file__)))
def info(title):
print title
print 'module name:', __name__
#print 'parent process:', os.getppid()
print 'process id:', os.getpid()
def f(name):
info('function f')
print 'hello', name
def f1(lock, num):
lock.acquire()
print "hello world %d, %d" % (os.getpid(), num)
lock.release()
def f2(x):
print os.getpid(), x
return x*x
def test1():
info('main line')
p = Process(target=f, args=('bob',))
p.start()
p.join()
# test the synchronization between processes
def test2():
lock = Lock()
for num in range(10):
Process(target=f1, args=(lock, num)).start()
# test a pool of process
def test3():
processPool = Pool(processes=4)
result = processPool.apply_async(f2,[10])
print result.get(timeout=1)
print processPool.map(f2, range(10))
processPool.close()
processPool.join()
def main():
print sys.path
#test1()
#test2()
test3()
if __name__ == '__main__':
main()