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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/stdx/functional.h"
#include "mongo/stdx/thread.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/concurrency/spin_lock.h"
#include "mongo/util/timer.h"
namespace {
using mongo::SpinLock;
using mongo::Timer;
namespace stdx = mongo::stdx;
class LockTester {
public:
LockTester(SpinLock* spin, int* counter) : _spin(spin), _counter(counter), _requests(0) {}
~LockTester() {
delete _t;
}
void start(int increments) {
_t = new stdx::thread([this, increments] { test(increments); });
}
void join() {
if (_t)
_t->join();
}
int requests() const {
return _requests;
}
private:
SpinLock* _spin; // not owned here
int* _counter; // not owned here
int _requests;
stdx::thread* _t;
void test(int increments) {
while (increments-- > 0) {
_spin->lock();
++(*_counter);
++_requests;
_spin->unlock();
}
}
LockTester(LockTester&);
LockTester& operator=(LockTester&);
};
TEST(Concurrency, ConcurrentIncs) {
SpinLock spin;
int counter = 0;
const int threads = 64;
const int incs = 50000;
LockTester* testers[threads];
Timer timer;
for (int i = 0; i < threads; i++) {
testers[i] = new LockTester(&spin, &counter);
}
for (int i = 0; i < threads; i++) {
testers[i]->start(incs);
}
for (int i = 0; i < threads; i++) {
testers[i]->join();
ASSERT_EQUALS(testers[i]->requests(), incs);
delete testers[i];
}
int ms = timer.millis();
mongo::unittest::log() << "spinlock ConcurrentIncs time: " << ms << std::endl;
ASSERT_EQUALS(counter, threads * incs);
}
} // namespace
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