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#include "test_pool.h"
#include <limits.h>
#include <vector>
#include "memorypool.h"
QTEST_MAIN(TestPool)
PoolObject::PoolObject() { foo = 3; }
PoolObject::~PoolObject() { foo = 0; }
TestPool::TestPool()
{
}
void TestPool::initTestCase()
{
}
void TestPool::testSimpleAllocation()
{
MemoryPool pool;
int *p = pool.allocate<int>(3);
p[0] = 10;
p[1] = 3;
p[2] = INT_MAX;
QCOMPARE(p[0], 10);
QCOMPARE(p[1], 3);
QCOMPARE(p[2], INT_MAX);
int *p2 = pool.allocate<int>(1);
pool.construct(p2, 11);
QCOMPARE(*p2, 11);
pool.destroy(p);
//nothing happens here (???)
QCOMPARE(*p2, 11);
}
void TestPool::testObjectAllocation()
{
MemoryPool pool;
PoolObject *p = pool.allocate<PoolObject>(1);
//object is not yet initialized (it's actually zeroed
//because the block in the pool is zeroed
QCOMPARE(p->foo, 0);
pool.construct(p, PoolObject());
//now we have the object there
QCOMPARE(p->foo, 3);
pool.destroy(p);
//destructor was called, the "foo" field is zeroed again
QCOMPARE(p->foo, 0);
}
void TestPool::testNewBlockAllocation()
{
MemoryPool pool;
int *p = pool.allocate<int>(MemoryPool::BLOCK_SIZE / sizeof(int));
//the last one in a block
int lastOne = MemoryPool::BLOCK_SIZE / sizeof(int) - 1;
p[lastOne] = 10;
//the first one in another block
int *p2 = pool.allocate<int>();
p2[0] = 11;
QCOMPARE(p[lastOne], 10);
QCOMPARE(p2[0], 11);
}
void TestPool::testWastedMemoryDueToBlockAllocation()
{
MemoryPool alloc;
//allocate a block and leave 2 last elements unallocated
int *p = alloc.allocate<int>(MemoryPool::BLOCK_SIZE / sizeof(int) - 2);
//the last one in a block
int lastOne = MemoryPool::BLOCK_SIZE / sizeof(int) - 3;
p[lastOne] = 10;
//allocate 5 elements and watch that 2 elements in the previous block
//are forgotten and a new block is created to allocate 5 elements continuously
int *p2 = alloc.allocate<int>(5);
p2[0] = 11;
QCOMPARE(p[lastOne], 10);
//those are the two forgotten elements from the first block
QCOMPARE(p[lastOne+1], 0);
QCOMPARE(p[lastOne+2], 0);
//new block will not start immediatelly after the old one (???)
QVERIFY((p + lastOne + 3) != p2);
QCOMPARE(p2[0], 11);
}
void TestPool::benchManyAllocations()
{
MemoryPool pool;
QBENCHMARK {
pool.allocate<char>(64);
}
}
void TestPool::benchManyPools()
{
QBENCHMARK {
MemoryPool pool;
for(int i = 0; i < 1000; ++i) {
pool.allocate<char>(64);
}
}
}
#include "test_pool.moc"
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