D38132.diff
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	diff --git a/contrib/llvm-project/libcxx/src/atomic.cpp b/contrib/llvm-project/libcxx/src/atomic.cpp
	--- a/contrib/llvm-project/libcxx/src/atomic.cpp
	+++ b/contrib/llvm-project/libcxx/src/atomic.cpp
	@@ -26,6 +26,11 @@
	# define SYS_futex SYS_futex_time64
	#endif

	+#elif defined(__FreeBSD__)
	+
	+#include <sys/types.h>
	+#include <sys/umtx.h>
	+
	#else // <- Add other operating systems here

	// Baseline needs no new headers
	@@ -72,6 +77,22 @@
	const_cast<__cxx_atomic_contention_t*>(__ptr), 0);
	}

	+#elif defined(__FreeBSD__) && defined(__LP64__)
	+
	+static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
	+ __cxx_contention_t __val)
	+{
	+ _umtx_op(const_cast<__cxx_atomic_contention_t*>(__ptr),
	+ UMTX_OP_WAIT, __val, NULL, NULL);
	+}
	+
	+static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,
	+ bool __notify_one)
	+{
	+ _umtx_op(const_cast<__cxx_atomic_contention_t*>(__ptr),
	+ UMTX_OP_WAKE, __notify_one ? 1 : INT_MAX, NULL, NULL);
	+}
	+
	#else // <- Add other operating systems here

	// Baseline is just a timed backoff