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// spin_lock_test.cpp : spin_lcok.{h, cpp} unit test
/**
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../pch.h"
#include <boost/thread/thread.hpp>
#include "dbtests.h"
#include "../util/concurrency/spin_lock.h"
namespace {
using mongo::SpinLock;
class LockTester {
public:
LockTester( SpinLock* spin, int* counter )
: _spin(spin), _counter(counter), _requests(0) {}
~LockTester() {
delete _t;
}
void start( int increments ) {
_t = new boost::thread( boost::bind(&LockTester::test, this, 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;
boost::thread* _t;
void test( int increments ) {
while ( increments-- > 0 ) {
_spin->lock();
++(*_counter);
++_requests;
_spin->unlock();
}
}
LockTester( LockTester& );
LockTester& operator=( LockTester& );
};
class ConcurrentIncs {
public:
void run() {
#if defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) || defined(_WIN32)
SpinLock spin;
int counter = 0;
const int threads = 64;
const int incs = 10000;
LockTester* testers[threads];
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];
}
ASSERT_EQUALS( counter, threads*incs );
#else
warning() << "spin lock slow on this platform" << endl;
#if defined(__linux__)
// we don't want to have linux binaries without a fast spinlock
//ASSERT( false ); TODO SERVER-3075
#endif
#endif
}
};
class SpinLockSuite : public Suite {
public:
SpinLockSuite() : Suite( "spinlock" ) {}
void setupTests() {
add< ConcurrentIncs >();
}
} spinLockSuite;
} // anonymous namespace
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