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annotate asyncio_threads/bank_question/README.md @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
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1 # Bank Account
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3 You are given a simplified multi-threaded “bank account” implementation used by one of our infrastructure teams. The current code processes deposits concurrently but produces incorrect results.
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5 ```
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6 class BankAccount:
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7 def __init__(self, balance):
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8 self.balance = balance
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10 def deposit(self, amount):
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11 new_balance = self.balance + amount # read
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12 time.sleep(0.1) # simulate delay
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13 self.balance = new_balance # write
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15 account = BankAccount(0)
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17 with ThreadPoolExecutor(max_workers=2) as executor:
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18 futures = [
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19 executor.submit(account.deposit, 500),
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20 executor.submit(account.deposit, 700),
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21 ]
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22 ```
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24 Task
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26 Identify the concurrency bugs in the implementation.
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28 Explain why these bugs occur.
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30 Fix the implementation without modifying the existing BankAccount class directly.
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32 You may use subclassing (Python) or embedding (Go-style composition), depending on the language you choose.
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34 Ensure your solution is thread-safe and produces the correct final balance (1200).