townforge/tests/unit_tests/threadpool.cpp
moneromooo-monero 2771a18e85
threadpool: allow leaf functions to run concurrently
Decrease the number of worker threads by one to account
for the fact the calling thread acts as a worker thread now
2018-06-26 22:15:22 +01:00

147 lines
4.6 KiB
C++

// Copyright (c) 2018, The Monero Project
//
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#include <atomic>
#include "gtest/gtest.h"
#include "misc_language.h"
#include "common/threadpool.h"
TEST(threadpool, wait_nothing)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests());
tools::threadpool::waiter waiter;
waiter.wait(tpool.get());
}
TEST(threadpool, wait_waits)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests());
tools::threadpool::waiter waiter;
std::atomic<bool> b(false);
tpool->submit(&waiter, [&b](){ epee::misc_utils::sleep_no_w(1000); b = true; });
ASSERT_FALSE(b);
waiter.wait(tpool.get());
ASSERT_TRUE(b);
}
TEST(threadpool, one_thread)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests(1));
tools::threadpool::waiter waiter;
std::atomic<unsigned int> counter(0);
for (size_t n = 0; n < 4096; ++n)
{
tpool->submit(&waiter, [&counter](){++counter;});
}
waiter.wait(tpool.get());
ASSERT_EQ(counter, 4096);
}
TEST(threadpool, many_threads)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests(256));
tools::threadpool::waiter waiter;
std::atomic<unsigned int> counter(0);
for (size_t n = 0; n < 4096; ++n)
{
tpool->submit(&waiter, [&counter](){++counter;});
}
waiter.wait(tpool.get());
ASSERT_EQ(counter, 4096);
}
static uint64_t fibonacci(std::shared_ptr<tools::threadpool> tpool, uint64_t n)
{
if (n <= 1)
return n;
uint64_t f1, f2;
tools::threadpool::waiter waiter;
tpool->submit(&waiter, [&tpool, &f1, n](){ f1 = fibonacci(tpool, n-1); });
tpool->submit(&waiter, [&tpool, &f2, n](){ f2 = fibonacci(tpool, n-2); });
waiter.wait(tpool.get());
return f1 + f2;
}
TEST(threadpool, reentrency)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests(4));
tools::threadpool::waiter waiter;
uint64_t f = fibonacci(tpool, 13);
waiter.wait(tpool.get());
ASSERT_EQ(f, 233);
}
TEST(threadpool, reentrancy)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests(4));
tools::threadpool::waiter waiter;
uint64_t f = fibonacci(tpool, 13);
waiter.wait(tpool.get());
ASSERT_EQ(f, 233);
}
TEST(threadpool, leaf_throws)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests());
tools::threadpool::waiter waiter;
bool thrown = false, executed = false;
tpool->submit(&waiter, [&](){
try { tpool->submit(&waiter, [&](){ executed = true; }); }
catch(const std::exception &e) { thrown = true; }
}, true);
waiter.wait(tpool.get());
ASSERT_TRUE(thrown);
ASSERT_FALSE(executed);
}
TEST(threadpool, leaf_reentrancy)
{
std::shared_ptr<tools::threadpool> tpool(tools::threadpool::getNewForUnitTests(4));
tools::threadpool::waiter waiter;
std::atomic<int> counter(0);
for (int i = 0; i < 1000; ++i)
{
tpool->submit(&waiter, [&](){
tools::threadpool::waiter waiter;
for (int j = 0; j < 500; ++j)
{
tpool->submit(&waiter, [&](){ ++counter; }, true);
}
waiter.wait(tpool.get());
});
}
waiter.wait(tpool.get());
ASSERT_EQ(counter, 500000);
}