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/* -------------------------------------------------------------------------- *
* Simbody(tm): SimTKcommon *
* -------------------------------------------------------------------------- *
* This is part of the SimTK biosimulation toolkit originating from *
* Simbios, the NIH National Center for Physics-Based Simulation of *
* Biological Structures at Stanford, funded under the NIH Roadmap for *
* Medical Research, grant U54 GM072970. See https://simtk.org/home/simbody. *
* *
* Portions copyright (c) 2008-12 Stanford University and the Authors. *
* Authors: Peter Eastman *
* Contributors: *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); you may *
* not use this file except in compliance with the License. You may obtain a *
* copy of the License at http://www.apache.org/licenses/LICENSE-2.0. *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* -------------------------------------------------------------------------- */
#include "SimTKcommon.h"
#include <iostream>
#define ASSERT(cond) {SimTK_ASSERT_ALWAYS(cond, "Assertion failed");}
using std::cout;
using std::endl;
using namespace SimTK;
using namespace std;
void testOperators() {
AtomicInteger a = 5;
ASSERT(a == 5);
ASSERT(a != 6);
a = 6;
ASSERT(a == 6);
ASSERT(++a == 7);
ASSERT(a == 7);
ASSERT(a++ == 7);
ASSERT(a == 8);
ASSERT(--a == 7);
ASSERT(a == 7);
ASSERT(a-- == 7);
ASSERT(a == 6);
a += 2;
ASSERT(a == 8);
a -= 5;
ASSERT(a == 3);
a *= -5;
ASSERT(a == -15);
a /= 3;
ASSERT(a == -5);
int i = a;
ASSERT(i == -5);
a = 3;
a |= 4;
ASSERT(a = 7);
a &= 13;
ASSERT(a == 5);
a ^= 12;
ASSERT(a == 9);
a %= 7;
ASSERT(a == 2);
a <<= 2;
ASSERT(a == 8);
a >>= 1;
ASSERT(a == 4);
}
void testParallelExecution() {
AtomicInteger index;
vector<int> flags(10000);
for (int i = 0; i < (int)flags.size(); ++i)
flags[i] = 0;
ParallelExecutor executor;
// See if the ++ operator is properly atomic.
class SetFlagTask : public ParallelExecutor::Task {
public:
SetFlagTask(vector<int>& flags, AtomicInteger& index) : flags(flags), index(index) {
}
void execute(int i) {
flags[index++]++;
}
private:
vector<int>& flags;
AtomicInteger& index;
};
for (int i = 0; i < 100; ++i) {
SetFlagTask task(flags, index);
index = 0;
executor.execute(task, 5000);
ASSERT(index == 5000);
for (int j = 0; j < (int)flags.size(); ++j)
ASSERT(flags[j] == (j < 5000 ? i+1 : 0));
}
// See if the += operator is properly atomic.
class IncrementTask : public ParallelExecutor::Task {
public:
IncrementTask(AtomicInteger& index) : index(index) {
}
void execute(int i) {
index += 2;
}
private:
AtomicInteger& index;
};
for (int i = 0; i < 100; ++i) {
IncrementTask task(index);
index = 0;
executor.execute(task, 5000);
ASSERT(index == 10000);
}
// See if the *= operator is properly atomic.
class MultiplyTask : public ParallelExecutor::Task {
public:
MultiplyTask(AtomicInteger& index) : index(index) {
}
void execute(int i) {
index *= (i%500 == 0 ? 2 : -1);
}
private:
AtomicInteger& index;
};
for (int i = 0; i < 100; ++i) {
MultiplyTask task(index);
index = 1;
executor.execute(task, 4999);
ASSERT(index == -1024);
}
}
int main() {
try {
testOperators();
testParallelExecution();
} catch(const std::exception& e) {
cout << "exception: " << e.what() << endl;
return 1;
}
cout << "Done" << endl;
return 0;
}
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