Etymology of futex

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "contraction",
      "args": {
        "1": "en",
        "2": "fast",
        "3": "userspace",
        "4": "mutex"
      },
      "expansion": "Contraction of fast + userspace + mutex"
    }
  ],
  "links": [
    [
      "fast",
      "fast#English"
    ],
    [
      "userspace",
      "userspace#English"
    ],
    [
      "mutex",
      "mutex#English"
    ],
    [
      "mutex",
      "mutex#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A mechanism for basic locking, based on an atomic integer in userspace that may be operated upon from multiple processes or threads."
      ],
      "tags": [],
      "recordId": "14f5a740ea54c8b1b08115c161fd495c7222dfa6c97574f30e86a9c5901cb7f7",
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