[6.0.2] Add a thread-safe implementation of Process.currentDirectoryURL #5095
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posix_spawn_file_actions_addchdir_np is the official way to set the working directory of a spawned process and is supported on both macOS and glibc (Linux, etc.). This makes Process.currentDirectoryURL thread-safe, as the current approach will result in the working directory being nondeterministically assigned when spawning processes across multiple threads, using different working directories.
Swift still needs to support Amazon Linux 2 until it EoLs in mid-2025. So restore the thread-unsafe fallback for systems with glibc older than version 2.29, which was removed in #4981.
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@swift-ci please test linux |
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@swift-ci please test windows |
parkera
approved these changes
Oct 2, 2024
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Also opened #5096 for release/6.0 to ensure this makes it into 6.0.3+ |
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posix_spawn_file_actions_addchdir_np is the official way to set the working directory of a spawned process and is supported on both macOS and glibc (Linux, etc.). This makes Process.currentDirectoryURL thread-safe, as the current approach will result in the working directory being nondeterministically assigned when spawning processes across multiple threads, using different working directories.
This already landed in main via #4981 (and amendment in #5090) and it's pretty disruptive for us so I'd like to get it into 6.0.2 if possible.