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Clean up tests to avoid needless yields and extraneous spurious wakeups

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This commit is contained in:
Christian Mazakas
2023-05-16 09:19:43 -07:00
parent 6295c7f0d4
commit 63026fd320
3 changed files with 50 additions and 19 deletions
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35
test/cfoa/swap_tests.cpp
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@@ -196,39 +196,58 @@ namespace {
std::condition_variable cv;
std::atomic_bool done1{false}, done2{false};
std::atomic<unsigned> num_swaps{0};
bool ready = false;
t1 = std::thread([&x1, &vals1, &l, &done1, &cv] {
t1 = std::thread([&x1, &vals1, &l, &done1, &cv, &ready, &m] {
l.arrive_and_wait();
for (std::size_t idx = 0; idx < vals1.size(); ++idx) {
auto const& val = vals1[idx];
x1.insert(val);
if (idx % 100 == 0) {
if (idx % (vals1.size() / 128) == 0) {
{
std::unique_lock<std::mutex> lk(m);
ready = true;
}
cv.notify_all();
}
std::this_thread::yield();
}
done1 = true;
{
std::unique_lock<std::mutex> lk(m);
ready = true;
}
cv.notify_all();
});
t2 = std::thread([&x2, &vals2, &l, &done2] {
t2 = std::thread([&x2, &vals2, &l, &done2, &ready, &cv, &m] {
l.arrive_and_wait();
for (auto const& val : vals2) {
for (std::size_t idx = 0; idx < vals2.size(); ++idx) {
auto const& val = vals2[idx];
x2.insert(val);
std::this_thread::yield();
if (idx % 100 == 0) {
std::this_thread::yield();
}
}
done2 = true;
{
std::unique_lock<std::mutex> lk(m);
ready = true;
}
cv.notify_all();
});
t3 =
std::thread([&x1, &x2, &m, &cv, &done1, &done2, &num_swaps, swapper] {
t3 = std::thread(
[&x1, &x2, &m, &cv, &done1, &done2, &num_swaps, swapper, &ready] {
do {
{
std::unique_lock<std::mutex> lk(m);
cv.wait(lk, [] { return true; });
cv.wait(lk, [&ready] { return ready; });
ready = false;
}
swapper(x1, x2);
++num_swaps;