Meaning
Asynchronously acquires an asyncio lock, suspending the current coroutine until the lock is available. It addresses the pain point of race conditions on shared mutable state in concurrent async code. It is triggered when entering a critical section that requires mutual exclusion without blocking the event loop.
Primary Function
Synchronization
Communicative Purpose
Request exclusive access to a shared resource in asynchronous code, yielding control until the lock is free.
Pattern
await lock.acquire(timeout=value)
Core Structure
await ....acquire()
Função primária
Synchronization
Propósito comunicativo
Request exclusive access to a shared resource in asynchronous code, yielding control until the lock is free.
Situações de gatilho
Async applications: protecting shared mutable state from concurrent modifications; Resource management: limiting concurrent access to an API or database connection; State synchronization: ensuring only one coroutine executes a critical transaction at a time.
Contextos
Inside async def functions when using asyncio.Lock, asyncio.Condition, asyncio.Semaphore, or any custom lock object with an awaitable acquire() method.
Padrão
await lock.acquire(timeout=value)
Estrutura central
await ....acquire()
Slots de substituição
lock: asyncio.Lock or similar awaitable object, timeout: float or None
Colocados típicos
- asyncio.Lock
- asyncio.Semaphore
- lock.release()
- try...finally
- async with
Substituições comuns
- lock can be asyncio.Lock()
- asyncio.Condition()
- asyncio.Semaphore()
- or a custom lock implementing awaitable acquire().
Erros comuns
Forgetting to await the call (cause: treating coroutine as synchronous; consequence: lock is never actually acquired, leading to race conditions), Failing to release in a finally block (cause: early return or unhandled exception; consequence: permanent deadlock), Using threading.Lock (cause: confusing sync and async primitives; consequence: blocks the entire event loop)
Similar / contraste
lock.acquire() without await returns a coroutine; lock.release() releases the lock; async with lock: provides a context‑manager equivalent.
Interferências
Coming from threading: using threading.Lock.acquire() which blocks the OS thread → use asyncio.Lock.acquire() which yields control to the event loop
Família do chunk
- asyncio synchronization primitives
Nuance
Do not use when async with lock: is available, as it handles release automatically. Acquiring a lock has minimal overhead, but failing to release it will halt all other coroutines waiting for that lock. The timeout parameter returns False if the lock cannot be acquired in time, rather than raising an exception.
Efeito pragmático
Signals intent to gain exclusive access while cooperatively yielding control, enabling cooperative multitasking.
Dica de memória
Think ‘await the lock’ to pause until you can proceed.
Nota
Always pair with a matching lock.release() or prefer async with lock: for automatic acquire/release.
Upgrade path
Consider using 'async with lock:' for automatic acquire and release.
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