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WIP: wrap: Implemented wraplock #13784

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WIP: wrap: Implemented wraplock #13784

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Commits on Oct 31, 2024

  1. wrap: Implemented wraplock 

    To avoid raceconditions, where one instance of meson currently downloads
a subproject defined in a wrapfile, while another either
  a. starts the download itself too
  b. attemts to evaluate the partially downloaded subproject
wraplock introduces a lockfile, which should prevent simultaneous access
of subprojects by wrap between different instances of meson.
    @sp1ritCS
    sp1ritCS committed Oct 31, 2024
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  2. wraplock: Provide no-op fallback implementation 

    This is used when fnctl is not found. In these cases there will be no
guarding of subprojects and multiple meson instances may still run into
eachother.
    @sp1ritCS
    sp1ritCS committed Oct 31, 2024
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