bool priv_timed_lock(sync::detail::system_time_point const& t)
{
long old_count = m_mutex.m_active_count;
m_mutex.mark_waiting_and_try_lock(old_count);
if ((old_count & sync::detail::windows::basic_mutex::lock_flag_value) == 0)
return true;
try
{
boost::detail::winapi::HANDLE_ handles[2];
handles[0] = m_mutex.get_event();
handles[1] = sync::detail::windows::get_waitable_timer();
if (!boost::detail::winapi::SetWaitableTimer(handles[1], reinterpret_cast< const boost::detail::winapi::LARGE_INTEGER_* >(&t.get()), 0, NULL, NULL, false))
{
const boost::detail::winapi::DWORD_ err = boost::detail::winapi::GetLastError();
BOOST_SYNC_DETAIL_THROW(lock_error, (err)("timed_mutex::timed_lock failed to set a timeout"));
}
while (true)
{
const boost::detail::winapi::DWORD_ res = boost::detail::winapi::WaitForMultipleObjects(sizeof(handles) / sizeof(*handles), handles, false, boost::detail::winapi::infinite);
if (res == boost::detail::winapi::wait_failed)
{
const boost::detail::winapi::DWORD_ err = boost::detail::winapi::GetLastError();
BOOST_SYNC_DETAIL_THROW(lock_error, (err)("timed_mutex::timed_lock failed in WaitForMultipleObjects"));
}
switch (res)
{
case boost::detail::winapi::wait_object_0: // event was notified
m_mutex.clear_waiting_and_try_lock(old_count);
if ((old_count & sync::detail::windows::basic_mutex::lock_flag_value) == 0)
return true;
break;
case boost::detail::winapi::wait_object_0 + 1: // timeout has expired
BOOST_ATOMIC_INTERLOCKED_EXCHANGE_ADD(&m_mutex.m_active_count, -1);
return false;
default:
BOOST_ASSERT(false);
}
}
}
catch (...)
{
BOOST_ATOMIC_INTERLOCKED_EXCHANGE_ADD(&m_mutex.m_active_count, -1);
throw;
}
}
sync::cv_status priv_timed_wait(unique_lock< Mutex >& lock, sync::detail::system_time_point const& t)
{
int const res = sync::detail::posix::pthread_cond_timedwait(&m_cond, lock.mutex()->native_handle(), &t.get());
if (res == ETIMEDOUT)
return sync::cv_status::timeout;
else if (res != 0)
BOOST_SYNC_DETAIL_THROW(wait_error, (res)("boost::sync::condition_variable timedwait failed in pthread_cond_timedwait"));
return sync::cv_status::no_timeout;
}
