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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "threads/Event.h"
#include "threads/IRunnable.h"
#include "threads/SharedSection.h"
#include "threads/test/TestHelpers.h"
#include <mutex>
#include <shared_mutex>
#include <stdio.h>
using namespace std::chrono_literals;
//=============================================================================
// Helper classes
//=============================================================================
template<class L>
class locker : public IRunnable
{
CSharedSection& sec;
CEvent* wait;
std::atomic<long>* mutex;
public:
volatile bool haslock;
volatile bool obtainedlock;
inline locker(CSharedSection& o, std::atomic<long>* mutex_ = NULL, CEvent* wait_ = NULL) :
sec(o), wait(wait_), mutex(mutex_), haslock(false), obtainedlock(false) {}
inline locker(CSharedSection& o, CEvent* wait_ = NULL) :
sec(o), wait(wait_), mutex(NULL), haslock(false), obtainedlock(false) {}
void Run() override
{
AtomicGuard g(mutex);
L lock(sec);
haslock = true;
obtainedlock = true;
if (wait)
wait->Wait();
haslock = false;
}
};
TEST(TestCritSection, General)
{
CCriticalSection sec;
std::unique_lock<CCriticalSection> l1(sec);
std::unique_lock<CCriticalSection> l2(sec);
}
TEST(TestSharedSection, General)
{
CSharedSection sec;
std::shared_lock<CSharedSection> l1(sec);
std::shared_lock<CSharedSection> l2(sec);
}
TEST(TestSharedSection, GetSharedLockWhileTryingExclusiveLock)
{
std::atomic<long> mutex(0L);
CEvent event;
CSharedSection sec;
std::shared_lock<CSharedSection> l1(sec); // get a shared lock
locker<std::unique_lock<CSharedSection>> l2(sec, &mutex);
thread waitThread1(l2); // try to get an exclusive lock
EXPECT_TRUE(waitForThread(mutex, 1, 10000ms));
std::this_thread::sleep_for(10ms); // still need to give it a chance to move ahead
EXPECT_TRUE(!l2.haslock); // this thread is waiting ...
EXPECT_TRUE(!l2.obtainedlock); // this thread is waiting ...
// now try and get a SharedLock
locker<std::shared_lock<CSharedSection>> l3(sec, &mutex, &event);
thread waitThread3(l3); // try to get a shared lock
EXPECT_TRUE(waitForThread(mutex, 2, 10000ms));
std::this_thread::sleep_for(10ms);
EXPECT_TRUE(l3.haslock);
event.Set();
EXPECT_TRUE(waitThread3.timed_join(10000ms));
// l3 should have released.
EXPECT_TRUE(!l3.haslock);
// but the exclusive lock should still not have happened
EXPECT_TRUE(!l2.haslock); // this thread is waiting ...
EXPECT_TRUE(!l2.obtainedlock); // this thread is waiting ...
// let it go
l1.unlock(); // the last shared lock leaves.
EXPECT_TRUE(waitThread1.timed_join(10000ms));
EXPECT_TRUE(l2.obtainedlock); // the exclusive lock was captured
EXPECT_TRUE(!l2.haslock); // ... but it doesn't have it anymore
}
TEST(TestSharedSection, TwoCase)
{
CSharedSection sec;
CEvent event;
std::atomic<long> mutex(0L);
locker<std::shared_lock<CSharedSection>> l1(sec, &mutex, &event);
{
std::shared_lock<CSharedSection> lock(sec);
thread waitThread1(l1);
EXPECT_TRUE(waitForWaiters(event, 1, 10000ms));
EXPECT_TRUE(l1.haslock);
event.Set();
EXPECT_TRUE(waitThread1.timed_join(10000ms));
}
locker<std::shared_lock<CSharedSection>> l2(sec, &mutex, &event);
{
std::unique_lock<CSharedSection> lock(sec); // get exclusive lock
thread waitThread2(l2); // thread should block
EXPECT_TRUE(waitForThread(mutex, 1, 10000ms));
std::this_thread::sleep_for(10ms);
EXPECT_TRUE(!l2.haslock);
lock.unlock();
EXPECT_TRUE(waitForWaiters(event, 1, 10000ms));
std::this_thread::sleep_for(10ms);
EXPECT_TRUE(l2.haslock);
event.Set();
EXPECT_TRUE(waitThread2.timed_join(10000ms));
}
}
TEST(TestMultipleSharedSection, General)
{
CSharedSection sec;
CEvent event;
std::atomic<long> mutex(0L);
locker<std::shared_lock<CSharedSection>> l1(sec, &mutex, &event);
{
std::shared_lock<CSharedSection> lock(sec);
thread waitThread1(l1);
EXPECT_TRUE(waitForThread(mutex, 1, 10000ms));
std::this_thread::sleep_for(10ms);
EXPECT_TRUE(l1.haslock);
event.Set();
EXPECT_TRUE(waitThread1.timed_join(10000ms));
}
locker<std::shared_lock<CSharedSection>> l2(sec, &mutex, &event);
locker<std::shared_lock<CSharedSection>> l3(sec, &mutex, &event);
locker<std::shared_lock<CSharedSection>> l4(sec, &mutex, &event);
locker<std::shared_lock<CSharedSection>> l5(sec, &mutex, &event);
{
std::unique_lock<CSharedSection> lock(sec);
thread waitThread1(l2);
thread waitThread2(l3);
thread waitThread3(l4);
thread waitThread4(l5);
EXPECT_TRUE(waitForThread(mutex, 4, 10000ms));
std::this_thread::sleep_for(10ms);
EXPECT_TRUE(!l2.haslock);
EXPECT_TRUE(!l3.haslock);
EXPECT_TRUE(!l4.haslock);
EXPECT_TRUE(!l5.haslock);
lock.unlock();
EXPECT_TRUE(waitForWaiters(event, 4, 10000ms));
EXPECT_TRUE(l2.haslock);
EXPECT_TRUE(l3.haslock);
EXPECT_TRUE(l4.haslock);
EXPECT_TRUE(l5.haslock);
event.Set();
EXPECT_TRUE(waitThread1.timed_join(10000ms));
EXPECT_TRUE(waitThread2.timed_join(10000ms));
EXPECT_TRUE(waitThread3.timed_join(10000ms));
EXPECT_TRUE(waitThread4.timed_join(10000ms));
}
}
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