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Db2alarm (alarm thread) : Notifies EDUs when their requested timer has expired (UNIX-only).
db2alarm(报警线程)：当edu请求的计时器到期时通知EDU(仅在UNIX上)。
youdao
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That is, a timer guard is ready if its timeout has expired.
也就是说，如果超时，则计时器警卫就会就绪。
youdao
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That is, a timer guard is ready if its timeout has expired.
也就是说，如果超时，则计时器警卫就会就绪。
youdao