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//===-- mutex_test.cpp ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "gwp_asan/mutex.h"
#include "gwp_asan/tests/harness.h"
#include <atomic>
#include <mutex>
#include <thread>
#include <vector>
using gwp_asan::Mutex;
using gwp_asan::ScopedLock;
TEST(GwpAsanMutexTest, LockUnlockTest) {
Mutex Mu;
ASSERT_TRUE(Mu.tryLock());
ASSERT_FALSE(Mu.tryLock());
Mu.unlock();
Mu.lock();
Mu.unlock();
// Ensure that the mutex actually unlocked.
ASSERT_TRUE(Mu.tryLock());
Mu.unlock();
}
TEST(GwpAsanMutexTest, ScopedLockUnlockTest) {
Mutex Mu;
{ ScopedLock L(Mu); }
// Locking will fail here if the scoped lock failed to unlock.
EXPECT_TRUE(Mu.tryLock());
Mu.unlock();
{
ScopedLock L(Mu);
EXPECT_FALSE(Mu.tryLock()); // Check that the c'tor did lock.
// Manually unlock and check that this succeeds.
Mu.unlock();
EXPECT_TRUE(Mu.tryLock()); // Manually lock.
}
EXPECT_TRUE(Mu.tryLock()); // Assert that the scoped destructor did unlock.
Mu.unlock();
}
static void synchronousIncrementTask(std::atomic<bool> *StartingGun, Mutex *Mu,
unsigned *Counter,
unsigned NumIterations) {
while (!StartingGun) {
// Wait for starting gun.
}
for (unsigned i = 0; i < NumIterations; ++i) {
ScopedLock L(*Mu);
(*Counter)++;
}
}
static void runSynchronisedTest(unsigned NumThreads, unsigned CounterMax) {
std::vector<std::thread> Threads;
ASSERT_TRUE(CounterMax % NumThreads == 0);
std::atomic<bool> StartingGun{false};
Mutex Mu;
unsigned Counter = 0;
for (unsigned i = 0; i < NumThreads; ++i)
Threads.emplace_back(synchronousIncrementTask, &StartingGun, &Mu, &Counter,
CounterMax / NumThreads);
StartingGun = true;
for (auto &T : Threads)
T.join();
EXPECT_EQ(CounterMax, Counter);
}
TEST(GwpAsanMutexTest, SynchronisedCounterTest) {
runSynchronisedTest(4, 1000000);
runSynchronisedTest(100, 1000000);
}
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