In Bug 1349912 we settled on winpthread for MinGW builds because we didn't have a better option. Someone told me about https://github.com/meganz/mingw-std-threads which may be a better solution.
Summary: Investigate mingw-std-threads → Investigate mingw-std-threads for MinGW build
See also discussions here: https://github.com/mingw-w64/mingw-w64/issues/1
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