Python多进程同步Lock、Semaphore、Event实例
同步的方法基本与多线程相同。
1)Lock
当多个进程需要访问共享资源的时候，Lock可以用来避免访问的冲突。
importmultiprocessing importsys
defworker_with(lock,f): withlock: fs=open(f,"a+") fs.write('Lockacquiredviawith\n') fs.close() defworker_no_with(lock,f): lock.acquire() try: fs=open(f,"a+") fs.write('Lockacquireddirectly\n') fs.close() finally: lock.release()
if__name__=="__main__":
f="file.txt" lock=multiprocessing.Lock() w=multiprocessing.Process(target=worker_with,args=(lock,f)) nw=multiprocessing.Process(target=worker_no_with,args=(lock,f))
w.start() nw.start()
w.join() nw.join()