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msg/async: avoid atomic variable overhead #12809

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merged 1 commit into from Jan 11, 2017
Merged

msg/async: avoid atomic variable overhead #12809

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6 changes: 3 additions & 3 deletions src/msg/async/Stack.cc
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Expand Up @@ -174,7 +174,7 @@ void NetworkStack::stop()
class C_drain : public EventCallback {
Mutex drain_lock;
Cond drain_cond;
std::atomic<unsigned> drain_count;
unsigned drain_count;

public:
explicit C_drain(size_t c)
Expand All @@ -183,11 +183,11 @@ class C_drain : public EventCallback {
void do_request(int id) {
Mutex::Locker l(drain_lock);
drain_count--;
drain_cond.Signal();
if (drain_count == 0) drain_cond.Signal();
}
void wait() {
Mutex::Locker l(drain_lock);
while (drain_count.load())
while (drain_count)
drain_cond.Wait(drain_lock);
}
};
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