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save the number of idle threads locally in disk_io_thread_pool::thread_active 

This cuts down on the number of atomic loads while also being more correct.
Before it was possible for m_num_idle_threads to increase before its value
could be stored in m_min_idle_threads.
This commit is contained in:
Steven Siloti 2018-04-28 15:38:29 -07:00 committed by Arvid Norberg
parent fc56ec194a
commit ec18742f8e
1 changed files with 4 additions and 4 deletions
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8
src/disk_io_thread_pool.cpp
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@ -93,12 +93,12 @@ namespace libtorrent {
void disk_io_thread_pool::thread_active()
{
--m_num_idle_threads;
TORRENT_ASSERT(m_num_idle_threads >= 0);
int const num_idle_threads = --m_num_idle_threads;
TORRENT_ASSERT(num_idle_threads >= 0);
int current_min = m_min_idle_threads;
while (m_num_idle_threads < current_min
&& !m_min_idle_threads.compare_exchange_weak(current_min, m_num_idle_threads));
while (num_idle_threads < current_min
&& !m_min_idle_threads.compare_exchange_weak(current_min, num_idle_threads));
}
bool disk_io_thread_pool::try_thread_exit(std::thread::id id)