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…rio#3551) trio._subprocess_platform.__init__ previously imported pipe from asyncio.windows_utils. Because asyncio/__init__.py imports the entire asyncio subsystem, importing trio on Windows loaded over 30 asyncio modules into sys.modules, increasing startup latency by ~10%. This reimplements windows_pipe in trio._subprocess_platform.windows directly on top of _winapi.CreateNamedPipe and _winapi.CreateFile, keeping Trio fully decoupled from asyncio during process initialization.
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trio._subprocess_platform.__init__previously importedpipefromasyncio.windows_utils. Becauseasyncio/__init__.pyimports the entire asyncio subsystem, importing Trio on Windows loaded over 30 asyncio modules intosys.modules, increasing startup latency by ~10%.This reimplements
windows_pipeintrio._subprocess_platform.windowsdirectly on top of_winapi.CreateNamedPipeand_winapi.CreateFile, keeping Trio fully decoupled from asyncio during process initialization.Fixes #3551.