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named_thread: implement "default" event loop

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Fixup "sleepy" thread at startup on Windows.
Permit threads which lack operator()() overload.
This commit is contained in:
Nekotekina 2021-02-24 13:56:02 +03:00
parent 29e7eda887
commit 3aaa0172d5
3 changed files with 22 additions and 8 deletions
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21
Utilities/Thread.h
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@ -42,6 +42,8 @@ class need_wakeup {};
template <class Context>
class named_thread;
class thread_base;
template <typename Ctx, typename X = void, typename... Args>
struct result_storage
{
@ -234,7 +236,7 @@ public:
}
// Wait for both thread sync var and provided atomic var
template <typename T, atomic_wait::op op = atomic_wait::op::eq, typename U>
template <atomic_wait::op Op = atomic_wait::op::eq, typename T, typename U>
static inline void wait_on(T& wait, U old, u64 usec = -1)
{
auto _this = g_tls_this_thread;
@ -245,7 +247,7 @@ public:
}
atomic_wait::list<2> list{};
list.set<0, op>(wait, old);
list.set<0, Op>(wait, old);
list.set<1>(_this->m_sync, 0, 4 + 1);
list.wait(atomic_wait_timeout{usec <= 0xffff'ffff'ffff'ffff / 1000 ? usec * 1000 : 0xffff'ffff'ffff'ffff});
}
@ -329,12 +331,23 @@ class named_thread final : public Context, result_storage<Context>, thread_base
if constexpr (result::empty)
{
// No result
Context::operator()();
if constexpr (std::is_invocable_v<Context>)
{
Context::operator()();
}
else
{
// Default event loop
while (thread_ctrl::state() != thread_state::aborting)
{
thread_ctrl::wait();
}
}
}
else
{
// Construct the result using placement new (copy elision should happen)
new (result::get()) typename result::type(Context::operator()());
new (result::get()) decltype(auto)(Context::operator()());
}
return thread::finalize(thread_state::finished);