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A thread attempting to re lock this mutex without first unlocking it shall return with an error.
如果线程在不首先解除锁定互斥锁的情况下尝试重新锁定该互斥锁，则会返回错误。
youdao
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A thread attempting to re lock this mutex without first unlocking it shall return with an error.
如果线程在不首先解除锁定互斥锁的情况下尝试重新锁定该互斥锁，则会返回错误。
youdao