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// threadedtests.cpp - Tests for threaded code
//
/**
* Copyright (C) 2008 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 "../bson/util/atomic_int.h"
#include "../util/concurrency/mvar.h"
#include "../util/concurrency/thread_pool.h"
#include <boost/thread.hpp>
#include <boost/bind.hpp>
#include "dbtests.h"
namespace ThreadedTests {
template <int nthreads_param=10>
class ThreadedTest {
public:
virtual void setup() {} //optional
virtual void subthread() = 0;
virtual void validate() = 0;
static const int nthreads = nthreads_param;
void run() {
setup();
launch_subthreads(nthreads);
validate();
}
virtual ~ThreadedTest() {}; // not necessary, but makes compilers happy
private:
void launch_subthreads(int remaining) {
if (!remaining) return;
boost::thread athread(boost::bind(&ThreadedTest::subthread, this));
launch_subthreads(remaining - 1);
athread.join();
}
};
// Tested with up to 30k threads
class IsAtomicUIntAtomic : public ThreadedTest<> {
static const int iterations = 1000000;
AtomicUInt target;
void subthread() {
for(int i=0; i < iterations; i++) {
//target.x++; // verified to fail with this version
target++;
}
}
void validate() {
ASSERT_EQUALS(target.x , unsigned(nthreads * iterations));
AtomicUInt u;
ASSERT_EQUALS(0u, u);
ASSERT_EQUALS(0u, u++);
ASSERT_EQUALS(2u, ++u);
ASSERT_EQUALS(2u, u--);
ASSERT_EQUALS(0u, --u);
ASSERT_EQUALS(0u, u);
}
};
class MVarTest : public ThreadedTest<> {
static const int iterations = 10000;
MVar<int> target;
public:
MVarTest() : target(0) {}
void subthread() {
for(int i=0; i < iterations; i++) {
int val = target.take();
#if BOOST_VERSION >= 103500
//increase chances of catching failure
boost::this_thread::yield();
#endif
target.put(val+1);
}
}
void validate() {
ASSERT_EQUALS(target.take() , nthreads * iterations);
}
};
class ThreadPoolTest {
static const int iterations = 10000;
static const int nThreads = 8;
AtomicUInt counter;
void increment(int n) {
for (int i=0; i<n; i++) {
counter++;
}
}
public:
void run() {
ThreadPool tp(nThreads);
for (int i=0; i < iterations; i++) {
tp.schedule(&ThreadPoolTest::increment, this, 2);
}
tp.join();
ASSERT(counter == (unsigned)(iterations * 2));
}
};
class LockTest {
public:
void run() {
// quick atomicint wrap test
// MSGID likely assumes this semantic
AtomicUInt counter = 0xffffffff;
counter++;
ASSERT( counter == 0 );
writelocktry lk( "" , 0 );
ASSERT( lk.got() );
}
};
class All : public Suite {
public:
All() : Suite( "threading" ) {
}
void setupTests() {
add< IsAtomicUIntAtomic >();
add< MVarTest >();
add< ThreadPoolTest >();
add< LockTest >();
}
} myall;
}
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