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// file : common/threads/driver.cxx
// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
// Test operations in a multi-threaded environment.
//
#include <vector>
#include <memory> // std::auto_ptr
#include <cstddef> // std::size_t
#include <cassert>
#include <iostream>
#include <odb/database.hxx>
#include <odb/transaction.hxx>
#include <odb/details/shared-ptr.hxx>
#include <odb/details/thread.hxx>
#include <common/config.hxx> // DATABASE_SQLITE
#include <common/common.hxx>
#ifdef DATABASE_SQLITE
# include <odb/sqlite/database.hxx>
#endif
#include "test.hxx"
#include "test-odb.hxx"
using namespace std;
using namespace odb::core;
namespace details = odb::details;
const unsigned long thread_count = 32;
const unsigned long iteration_count = 50;
const unsigned long sub_iteration_count = 20;
struct task
{
task (database& db, unsigned long n)
: db_ (db), n_ (n)
{
}
void
execute ()
{
try
{
for (unsigned long i (0); i < iteration_count; ++i)
{
unsigned long id ((n_ * iteration_count + i) * 3);
{
object o1 (id, "first object");
object o2 (id + 1, "second object");
object o3 (id + 2, "third object");
transaction t (db_.begin ());
db_.persist (o1);
db_.persist (o2);
db_.persist (o3);
t.commit ();
}
// The following transaction may lead to a deadlock in some database
// implementations (read to write lock upgrade).
//
while (true)
{
try
{
#ifndef DATABASE_SQLITE
transaction t (db_.begin ());
#else
// SQLite has a peculiar table locking mode (shared cache)
// which can lead to any of the transactions in this test
// deadlocking even though they shouldn't from the user's
// perspective. One way to work around this problem is to
// start a "write" transaction as such right away.
//
transaction t (
static_cast<odb::sqlite::database&> (db_).begin_immediate ());
#endif
auto_ptr<object> o (db_.load<object> (id));
assert (o->str_ == "first object");
o->str_ = "another value";
db_.update (*o);
t.commit ();
break;
}
catch (deadlock const&) {}
}
for (unsigned long j (0); j < sub_iteration_count; ++j)
{
typedef odb::query<object> query;
typedef odb::result<object> result;
transaction t (db_.begin ());
result r (db_.query<object> (query::str == "another value", false));
bool found (false);
for (result::iterator i (r.begin ()); i != r.end (); ++i)
{
if (i->id_ == id)
{
found = true;
break;
}
}
assert (found);
t.commit ();
}
{
transaction t (db_.begin ());
db_.erase<object> (id);
t.commit ();
}
}
}
catch (const odb::exception& e)
{
cerr << e.what () << endl;
}
}
static void*
execute (void* arg)
{
static_cast<task*> (arg)->execute ();
return 0;
}
database& db_;
unsigned long n_;
};
void
test (int argc, char* argv[], size_t max_connections)
{
auto_ptr<database> db (create_database (argc, argv, true, max_connections));
vector<details::shared_ptr<details::thread> > threads;
vector<details::shared_ptr<task> > tasks;
for (unsigned long i (0); i < thread_count; ++i)
{
details::shared_ptr<task> t (new (details::shared) task (*db, i));
tasks.push_back (t);
threads.push_back (
details::shared_ptr<details::thread> (
new (details::shared) details::thread (&task::execute, t.get ())));
}
for (unsigned long i (0); i < thread_count; ++i)
threads[i]->join ();
{
typedef odb::result<object> result;
transaction t (db->begin ());
result r (db->query<object> ());
for (result::iterator i (r.begin ()); i != r.end (); ++i)
db->erase<object> (i->id_);
t.commit ();
}
}
int
main (int argc, char* argv[])
{
try
{
test (argc, argv, 0);
test (argc, argv, thread_count - 1);
test (argc, argv, thread_count / 2);
test (argc, argv, thread_count / 4);
}
catch (const odb::exception& e)
{
cerr << e.what () << endl;
return 1;
}
}
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