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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/testapp.h>
#include <vespa/vespalib/util/sync.h>
namespace vespalib {
class TryLock
{
private:
friend class LockGuard;
friend class MonitorGuard;
std::unique_lock<std::mutex> _guard;
std::condition_variable *_cond;
public:
TryLock(const Lock &lock)
: _guard(*lock._mutex, std::try_to_lock), _cond(nullptr)
{}
TryLock(const Monitor &mon)
: _guard(*mon._mutex, std::try_to_lock),
_cond(_guard ? mon._cond.get() : nullptr)
{}
~TryLock() = default;
TryLock(const TryLock &) = delete;
TryLock &operator=(const TryLock &) = delete;
/**
* @brief Check whether this object holds a lock
*
* @return true if this object holds a lock
**/
bool hasLock() const { return static_cast<bool>(_guard); }
void unlock() {
if (_guard) {
_guard.unlock();
_cond = nullptr;
}
}
};
}
using namespace vespalib;
#define CHECK_LOCKED(m) { TryLock tl(m); EXPECT_TRUE(!tl.hasLock()); }
#define CHECK_UNLOCKED(m) { TryLock tl(m); EXPECT_TRUE(tl.hasLock()); }
class Test : public TestApp
{
private:
Lock _lock;
Monitor _monitor;
LockGuard lockLock() { return LockGuard(_lock); }
LockGuard lockMonitor() { return LockGuard(_monitor); }
MonitorGuard obtainMonitor() { return MonitorGuard(_monitor); }
public:
~Test() override;
void testCountDownLatch();
int Main() override;
};
Test::~Test() {}
void
Test::testCountDownLatch() {
{
CountDownLatch latch(5);
EXPECT_EQUAL(latch.getCount(), 5u);
latch.countDown();
EXPECT_EQUAL(latch.getCount(), 4u);
latch.countDown();
EXPECT_EQUAL(latch.getCount(), 3u);
latch.countDown();
EXPECT_EQUAL(latch.getCount(), 2u);
latch.countDown();
EXPECT_EQUAL(latch.getCount(), 1u);
latch.countDown();
EXPECT_EQUAL(latch.getCount(), 0u);
latch.countDown();
EXPECT_EQUAL(latch.getCount(), 0u);
latch.await(); // should not block
latch.await(); // should not block
}
{
Gate gate;
EXPECT_EQUAL(gate.getCount(), 1u);
gate.countDown();
EXPECT_EQUAL(gate.getCount(), 0u);
gate.countDown();
EXPECT_EQUAL(gate.getCount(), 0u);
gate.await(); // should not block
gate.await(); // should not block
}
{
Gate gate;
EXPECT_EQUAL(gate.getCount(), 1u);
EXPECT_EQUAL(gate.await(0), false);
EXPECT_EQUAL(gate.await(10), false);
gate.countDown();
EXPECT_EQUAL(gate.getCount(), 0u);
EXPECT_EQUAL(gate.await(0), true);
EXPECT_EQUAL(gate.await(10), true);
}
}
int
Test::Main()
{
TEST_INIT("sync_test");
{
Lock lock;
{
CHECK_UNLOCKED(lock);
LockGuard guard(lock);
CHECK_LOCKED(lock);
}
CHECK_UNLOCKED(lock);
{
LockGuard guard(lock);
CHECK_LOCKED(lock);
guard.unlock();
CHECK_UNLOCKED(lock);
}
}
// you can use a LockGuard to lock a Monitor
{
Monitor monitor;
{
CHECK_UNLOCKED(monitor);
LockGuard guard(monitor);
CHECK_LOCKED(monitor);
}
CHECK_UNLOCKED(monitor);
{
LockGuard guard(monitor);
CHECK_LOCKED(monitor);
guard.unlock();
CHECK_UNLOCKED(monitor);
}
}
{
Monitor monitor;
{
CHECK_UNLOCKED(monitor);
MonitorGuard guard(monitor);
guard.signal();
guard.broadcast();
guard.wait(10);
CHECK_LOCKED(monitor);
}
CHECK_UNLOCKED(monitor);
{
MonitorGuard guard(monitor);
CHECK_LOCKED(monitor);
guard.unlock();
CHECK_UNLOCKED(monitor);
}
}
// you can lock const objects
{
const Lock lock;
CHECK_UNLOCKED(lock);
LockGuard guard(lock);
CHECK_LOCKED(lock);
}
{
const Monitor lock;
CHECK_UNLOCKED(lock);
LockGuard guard(lock);
CHECK_LOCKED(lock);
}
{
const Monitor monitor;
CHECK_UNLOCKED(monitor);
MonitorGuard guard(monitor);
CHECK_LOCKED(monitor);
}
// LockGuard/MonitorGuard have destructive move
{
Lock lock;
CHECK_UNLOCKED(lock);
LockGuard a(lock);
CHECK_LOCKED(lock);
{
CHECK_LOCKED(lock);
LockGuard b(std::move(a));
CHECK_LOCKED(lock);
}
CHECK_UNLOCKED(lock);
}
{
Monitor mon;
CHECK_UNLOCKED(mon);
MonitorGuard a(mon);
CHECK_LOCKED(mon);
{
CHECK_LOCKED(mon);
MonitorGuard b(std::move(a));
CHECK_LOCKED(mon);
}
CHECK_UNLOCKED(mon);
}
// Destructive copy also works for return value handover
{
CHECK_UNLOCKED(_lock);
CHECK_UNLOCKED(_monitor);
{
CHECK_UNLOCKED(_lock);
CHECK_UNLOCKED(_monitor);
LockGuard a(lockLock());
CHECK_LOCKED(_lock);
CHECK_UNLOCKED(_monitor);
LockGuard b = lockMonitor(); // copy, not assign
CHECK_LOCKED(_lock);
CHECK_LOCKED(_monitor);
}
CHECK_UNLOCKED(_lock);
CHECK_UNLOCKED(_monitor);
}
{
CHECK_UNLOCKED(_monitor);
{
CHECK_UNLOCKED(_monitor);
MonitorGuard guard(obtainMonitor());
CHECK_LOCKED(_monitor);
}
CHECK_UNLOCKED(_monitor);
}
// Test that guards can be matched to locks/monitors
{
Lock lock1;
Lock lock2;
LockGuard lockGuard1(lock1);
LockGuard lockGuard2(lock2);
EXPECT_TRUE(lockGuard1.locks(lock1));
EXPECT_FALSE(lockGuard1.locks(lock2));
EXPECT_TRUE(lockGuard2.locks(lock2));
EXPECT_FALSE(lockGuard2.locks(lock1));
lockGuard1.unlock();
EXPECT_FALSE(lockGuard1.locks(lock1));
}
{
Monitor lock1;
Monitor lock2;
MonitorGuard lockGuard1(lock1);
MonitorGuard lockGuard2(lock2);
EXPECT_TRUE(lockGuard1.monitors(lock1));
EXPECT_FALSE(lockGuard1.monitors(lock2));
EXPECT_TRUE(lockGuard2.monitors(lock2));
EXPECT_FALSE(lockGuard2.monitors(lock1));
lockGuard1.unlock();
EXPECT_FALSE(lockGuard1.monitors(lock1));
}
testCountDownLatch();
TEST_DONE();
}
TEST_APPHOOK(Test)
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