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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;
using namespace std::chrono;
/// Try best to make this thread not progress faster than the main thread
static void yield() {
#ifdef LLVM_ENABLE_THREADS
std::this_thread::yield();
#endif
std::this_thread::sleep_for(milliseconds(200));
#ifdef LLVM_ENABLE_THREADS
std::this_thread::yield();
#endif
}
// 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 (std::find(UnsupportedEnvironments.begin(), UnsupportedEnvironments.end(),
Host.getEnvironment()) != UnsupportedEnvironments.end())
return true;
if (std::find(UnsupportedOSs.begin(), UnsupportedOSs.end(), Host.getOS())
!= UnsupportedOSs.end())
return true;
if (std::find(UnsupportedArchs.begin(), UnsupportedArchs.end(), Host.getArch())
!= UnsupportedArchs.end())
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);
}
};
#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([&checked_in, i] {
yield();
++checked_in;
});
}
ASSERT_EQ(0, checked_in);
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};
// sleep here just to ensure that the not-equal is correct.
Pool.async([&i] {
yield();
++i;
});
Pool.async([&i] { ++i; });
ASSERT_NE(2, i.load());
Pool.wait();
ASSERT_EQ(2, i.load());
}
TEST_F(ThreadPoolTest, GetFuture) {
CHECK_UNSUPPORTED();
ThreadPool Pool;
std::atomic_int i{0};
// sleep here just to ensure that the not-equal is correct.
Pool.async([&i] {
yield();
++i;
});
// Force the future using get()
Pool.async([&i] { ++i; }).get();
ASSERT_NE(2, i.load());
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([&checked_in, i] {
yield();
++checked_in;
});
}
ASSERT_EQ(0, checked_in);
}
ASSERT_EQ(5, checked_in);
}
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