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Programming-Idioms

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  • Python

Idiom #33 Atomically read and update variable

Assign to the variable x the new value f(x), making sure that no other thread may modify x between the read and the write.

import threading
lock = threading.Lock()

lock.acquire()
try:
	x = f(x)
finally:
	lock.release()
import threading
with threading.Lock():
    x = f(x)
(def x (atom 0))
(def f inc)
(swap! x f)

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