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#include <intrin.h>
#include <cstdint>
_LIBCPP_BEGIN_NAMESPACE_STD
namespace {
static const int __msvc_locks_size = 1024;
volatile long __msvc_locks[__msvc_locks_size];
size_t __msvc_lock_hash(void* __p) {
uintptr_t __num = reinterpret_cast<uintptr_t>(__p);
return (__num ^ (__num >> 10)) & (__msvc_locks_size - 1);
}
}
void __msvc_lock(void* __p) {
volatile long& __lock = __msvc_locks[__msvc_lock_hash(__p)];
while (_InterlockedExchange(&__lock, 1) == 0) {
#if defined(_M_ARM) || defined(_M_ARM64)
__yield();
#endif
}
}
void __msvc_unlock(void* __p) {
volatile long& __lock = __msvc_locks[__msvc_lock_hash(__p)];
_InterlockedExchange(&__lock, 0);
}
_LIBCPP_END_NAMESPACE_STD
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