Unit Instance

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        "This requires one to take special care when using an item protected by atomic instructions. For example, in the sleep mutex implementation, we have to use an `atomic_cmpset` rather than an `atomic_set` to turn on the `MTX_CONTESTED` bit. The reason is that we read the value of `mtx_lock` into a variable and then make a decision based on that read. However, the value we read may be stale, or it may change while we are making our decision. Thus, when the `atomic_set` executed, it may end up setting the bit on another value than the one we made the decision on. Thus, we have to use an `atomic_cmpset` to set the value only if the value we made the decision on is up-to-date and valid."
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    "note": "type: Plain text",
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    "priority": 100,
    "id": 1761591,
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    "timestamp": "2025-01-22T18:20:33.694460Z"
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