Overhaul `condition_variable`#4720

Merged

StephanTLavavej merged 13 commits intomicrosoft:mainfrom StephanTLavavej:condition_variable-overhaul

Jun 18, 2024

+70-81

Commits on Jun 9, 2024

mutex.cpp doesn't use anything from primitives.hpp.
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primitives.hpp doesn't need <type_traits>.
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Stop calling no-op _Cnd_destroy_in_situ().
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Statically initialize _Cnd_internal_imp_t.
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Now we can stop calling _Cnd_init_in_situ(), with _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR as the escape hatch.
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Simplify the definition of _Cnd_init_in_situ().
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Stop calling _Cnd_init() and _Cnd_destroy().
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Stop calling _Mtx_init() and _Mtx_destroy().
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Declare _Mtx_init_in_situ() only when needed.
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Replace Concurrency::details::stl_condition_variable_win7 with non-member functions.
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Simplify _Primitive_wait[_for]() by taking _Mtx_t mtx.
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Skip 3 libcxx tests for Clang until LLVM-94907 is merged.
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Commits on Jun 14, 2024

Silence false positive warning C26495.
StephanTLavavej
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