On 28/09/20 14:29 -0700, Thomas Rodgers wrote:
+ template<typename _Duration>
+ __atomic_wait_status
+ __platform_wait_until_impl(__platform_wait_t* __addr,
+ __platform_wait_t __val,
+ const
chrono::time_point<__platform_wait_clock_t,
+ _Duration>& __atime)
noexcept
+ {
+ auto __s = chrono::time_point_cast<chrono::seconds>(__atime);
+ auto __ns = chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
+
+ struct timespec __rt =
+ {
+ static_cast<std::time_t>(__s.time_since_epoch().count()),
+ static_cast<long>(__ns.count())
+ };
+
+ auto __e = syscall (SYS_futex, __addr,
+
static_cast<int>(__futex_wait_flags::__wait_bitset_private),
+ __val, &__rt, nullptr,
+
static_cast<int>(__futex_wait_flags::__bitset_match_any));
+ if (__e && !(errno == EINTR || errno == EAGAIN || errno == ETIMEDOUT))
+ std::terminate();
+ return (__platform_wait_clock_t::now() < __atime)
+ ? __atomic_wait_status::no_timeout :
__atomic_wait_status::timeout;
+ }
+
+ template<typename _Clock, typename _Duration>
+ __atomic_wait_status
+ __platform_wait_until(__platform_wait_t* __addr, __platform_wait_t __val,
+ const chrono::time_point<_Clock, _Duration>&
__atime)
+ {
+ if constexpr (is_same_v<__platform_wait_clock_t, _Clock>)
This case is impossible, since the other overload would be selected
if the clock is the __platform_wait_clock_t (unless the caller says
__platform_wait_until<__platform_wait_until> to explicitly call this
overload, but users can't call this function, and we won't do that).
Which overload?
I must have misread __platform_wait_until_impl above as
__platform_wait_until. Ignore this comment, sorry!
