Explicit init of Thread and Fiber class variables#15369
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straight-shoota merged 1 commit intocrystal-lang:masterfrom Jan 25, 2025
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Can we split this into two PRs? I understand the changes are largely independent of each other. |
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Replaces the implicit initialization of Thread and Fiber class variables with an explicit initializer since both should be initialized before `__crystal_once_init` is called. This is working for now because the `class_[getter|property]` macros in Thread and Fiber don't protect against either recursion nor parallel initializations, but we plan to protect them (using Mutex) which would immediately break with an infinite recursion: Mutex#lock -> Fiber#current -> Thread#current -> Mutex#lock -> ...
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Adds
Thread.init,Fiber.initthat explicitly initialize the class variables defined onThreadandFiber.In order to implement #14905 we'll need the ability to access
Fiber.currentwhich depends onThread.currentbut if these accessors use the class getter/property macros then we'll enter an infinite recursion.AddsCrystal.once_initto allow to remove theCrystal.once_mutex=setter. It also removes the need for the__crystal_once_initfun which won't be defined anymore —it's only kept for the legacy implementation.Those initializers are now explicitly called from a new
Crystal.init_runtimemethod called byCrystal.main, but also by the interpreter that doesn't callCrystal.main—not currently needed, but it will be to reuse crystal/once to implement #14905.