feat(win): Add non-blocking overlapped I/O implementation for Windows#19

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lrodorigo-versuni wants to merge 13 commits into

gbionics:mainfrom

lrodorigo-versuni:feature/win-overlapped-io

Commits on May 27, 2026

feat(win): add overlapped I/O support to header - add OVERLAPPED members
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feat(win): rewrite read/write to use overlapped (async) I/O
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refactor(win): restore original blocking win.cc implementation
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refactor(win): restore original win.h header
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feat(win): add overlapped I/O header (win_async.h)
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feat(win): add overlapped I/O implementation (win_async.cc)
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feat(cmake): add SERIAL_CPP_WIN_ASYNC option to select overlapped I/O
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test: add async I/O test program with concurrent reader/writer threads
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build: add serial_cpp_async_test example to CMakeLists.txt
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fix(win_async): make event_mask a class member to prevent dangling stack write
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fix(win_async): rewrite to fix access violations from dangling OVERLAPPED/stack pointers
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Fix header include
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Default ASYNC to off
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