Os Thread Barrier

In this tutorial, you'll learn about How to Fix Barrier Errors. We cover key concepts, practical examples, and best practices.

Fix barrier errors when threads not synchronized to wait at common point causing partial progress.

Quick Fix

Wrong

import threading, time
results=[]
def worker(n):
    time.sleep(n)
    results.append(n)  # No barrier! Main proceeds before all workers done.

Main thread continues before all workers finish. results incomplete.

Right

import threading, time
barrier=threading.Barrier(3)  # 2 workers + main
results=[]
def worker(n):
    time.sleep(n); results.append(n)
    barrier.wait()
threading.Thread(target=worker,args=(0.1,)).start()
threading.Thread(target=worker,args=(0.2,)).start()
barrier.wait()
print(results)  # [0.1, 0.2] (both complete)

[0.1, 0.2] printed. Both workers complete before main proceeds.

Prevention

Use Barrier to synchronize N threads at rendezvous point. All proceed together after N wait() calls.

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