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//========- unittests/Support/ThreadPools.cpp - ThreadPools.h tests --========//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ThreadPool.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/TargetSelect.h"
#include "gtest/gtest.h"
using namespace llvm;
// Fixture for the unittests, allowing to *temporarily* disable the unittests
// on a particular platform
class ThreadPoolTest : public testing::Test {
Triple Host;
SmallVector<Triple::ArchType, 4> UnsupportedArchs;
SmallVector<Triple::OSType, 4> UnsupportedOSs;
SmallVector<Triple::EnvironmentType, 1> UnsupportedEnvironments;
protected:
// This is intended for platform as a temporary "XFAIL"
bool isUnsupportedOSOrEnvironment() {
Triple Host(Triple::normalize(sys::getProcessTriple()));
if (find(UnsupportedEnvironments, Host.getEnvironment()) !=
UnsupportedEnvironments.end())
return true;
if (is_contained(UnsupportedOSs, Host.getOS()))
return true;
if (is_contained(UnsupportedArchs, Host.getArch()))
return true;
return false;
}
ThreadPoolTest() {
// Add unsupported configuration here, example:
// UnsupportedArchs.push_back(Triple::x86_64);
// See https://llvm.org/bugs/show_bug.cgi?id=25829
UnsupportedArchs.push_back(Triple::ppc64le);
UnsupportedArchs.push_back(Triple::ppc64);
}
/// Make sure this thread not progress faster than the main thread.
void waitForMainThread() {
std::unique_lock<std::mutex> LockGuard(WaitMainThreadMutex);
WaitMainThread.wait(LockGuard, [&] { return MainThreadReady; });
}
/// Set the readiness of the main thread.
void setMainThreadReady() {
{
std::unique_lock<std::mutex> LockGuard(WaitMainThreadMutex);
MainThreadReady = true;
}
WaitMainThread.notify_all();
}
void SetUp() override { MainThreadReady = false; }
std::condition_variable WaitMainThread;
std::mutex WaitMainThreadMutex;
bool MainThreadReady;
};
#define CHECK_UNSUPPORTED() \
do { \
if (isUnsupportedOSOrEnvironment()) \
return; \
} while (0); \
TEST_F(ThreadPoolTest, AsyncBarrier) {
CHECK_UNSUPPORTED();
// test that async & barrier work together properly.
std::atomic_int checked_in{0};
ThreadPool Pool;
for (size_t i = 0; i < 5; ++i) {
Pool.async([this, &checked_in] {
waitForMainThread();
++checked_in;
});
}
ASSERT_EQ(0, checked_in);
setMainThreadReady();
Pool.wait();
ASSERT_EQ(5, checked_in);
}
static void TestFunc(std::atomic_int &checked_in, int i) { checked_in += i; }
TEST_F(ThreadPoolTest, AsyncBarrierArgs) {
CHECK_UNSUPPORTED();
// Test that async works with a function requiring multiple parameters.
std::atomic_int checked_in{0};
ThreadPool Pool;
for (size_t i = 0; i < 5; ++i) {
Pool.async(TestFunc, std::ref(checked_in), i);
}
Pool.wait();
ASSERT_EQ(10, checked_in);
}
TEST_F(ThreadPoolTest, Async) {
CHECK_UNSUPPORTED();
ThreadPool Pool;
std::atomic_int i{0};
Pool.async([this, &i] {
waitForMainThread();
++i;
});
Pool.async([&i] { ++i; });
ASSERT_NE(2, i.load());
setMainThreadReady();
Pool.wait();
ASSERT_EQ(2, i.load());
}
TEST_F(ThreadPoolTest, GetFuture) {
CHECK_UNSUPPORTED();
ThreadPool Pool{2};
std::atomic_int i{0};
Pool.async([this, &i] {
waitForMainThread();
++i;
});
// Force the future using get()
Pool.async([&i] { ++i; }).get();
ASSERT_NE(2, i.load());
setMainThreadReady();
Pool.wait();
ASSERT_EQ(2, i.load());
}
TEST_F(ThreadPoolTest, PoolDestruction) {
CHECK_UNSUPPORTED();
// Test that we are waiting on destruction
std::atomic_int checked_in{0};
{
ThreadPool Pool;
for (size_t i = 0; i < 5; ++i) {
Pool.async([this, &checked_in] {
waitForMainThread();
++checked_in;
});
}
ASSERT_EQ(0, checked_in);
setMainThreadReady();
}
ASSERT_EQ(5, checked_in);
}
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