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Swoole\Coroutine\Lock::lock — Acquire the lock, blocking if necessary
When executing the lock operation, if the lock is already held by another coroutine, the current coroutine will actively yield CPU control and enter a suspended state. When the coroutine holding the lock calls unlock(), the waiting coroutine will be awakened and try to acquire the lock again.
この関数にはパラメータはありません。
Returns true if the lock was acquired successfully,
false otherwise.