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// (C) Copyright 2006-7 Anthony Williams
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/test/unit_test.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/xtime.hpp>
#include "util.inl"
#include "shared_mutex_locking_thread.hpp"
#define CHECK_LOCKED_VALUE_EQUAL(mutex_name,value,expected_value) \
{ \
boost::mutex::scoped_lock lock(mutex_name); \
BOOST_CHECK_EQUAL(value,expected_value); \
}
void test_only_one_upgrade_lock_permitted()
{
unsigned const number_of_threads=100;
boost::thread_group pool;
boost::shared_mutex rw_mutex;
unsigned unblocked_count=0;
unsigned simultaneous_running_count=0;
unsigned max_simultaneous_running=0;
boost::mutex unblocked_count_mutex;
boost::condition_variable unblocked_condition;
boost::mutex finish_mutex;
boost::mutex::scoped_lock finish_lock(finish_mutex);
try
{
for(unsigned i=0;i<number_of_threads;++i)
{
pool.create_thread(locking_thread<boost::upgrade_lock<boost::shared_mutex> >(rw_mutex,unblocked_count,unblocked_count_mutex,unblocked_condition,
finish_mutex,simultaneous_running_count,max_simultaneous_running));
}
boost::thread::sleep(delay(1));
CHECK_LOCKED_VALUE_EQUAL(unblocked_count_mutex,unblocked_count,1U);
finish_lock.unlock();
pool.join_all();
}
catch(...)
{
pool.interrupt_all();
pool.join_all();
throw;
}
CHECK_LOCKED_VALUE_EQUAL(unblocked_count_mutex,unblocked_count,number_of_threads);
CHECK_LOCKED_VALUE_EQUAL(unblocked_count_mutex,max_simultaneous_running,1u);
}
void test_can_lock_upgrade_if_currently_locked_shared()
{
boost::thread_group pool;
boost::shared_mutex rw_mutex;
unsigned unblocked_count=0;
unsigned simultaneous_running_count=0;
unsigned max_simultaneous_running=0;
boost::mutex unblocked_count_mutex;
boost::condition_variable unblocked_condition;
boost::mutex finish_mutex;
boost::mutex::scoped_lock finish_lock(finish_mutex);
unsigned const reader_count=100;
try
{
for(unsigned i=0;i<reader_count;++i)
{
pool.create_thread(locking_thread<boost::shared_lock<boost::shared_mutex> >(rw_mutex,unblocked_count,unblocked_count_mutex,unblocked_condition,
finish_mutex,simultaneous_running_count,max_simultaneous_running));
}
boost::thread::sleep(delay(1));
pool.create_thread(locking_thread<boost::upgrade_lock<boost::shared_mutex> >(rw_mutex,unblocked_count,unblocked_count_mutex,unblocked_condition,
finish_mutex,simultaneous_running_count,max_simultaneous_running));
{
boost::mutex::scoped_lock lk(unblocked_count_mutex);
while(unblocked_count<(reader_count+1))
{
unblocked_condition.wait(lk);
}
}
CHECK_LOCKED_VALUE_EQUAL(unblocked_count_mutex,unblocked_count,reader_count+1);
finish_lock.unlock();
pool.join_all();
}
catch(...)
{
pool.interrupt_all();
pool.join_all();
throw;
}
CHECK_LOCKED_VALUE_EQUAL(unblocked_count_mutex,unblocked_count,reader_count+1);
CHECK_LOCKED_VALUE_EQUAL(unblocked_count_mutex,max_simultaneous_running,reader_count+1);
}
namespace
{
class simple_writing_thread
{
boost::shared_mutex& rwm;
boost::mutex& finish_mutex;
boost::mutex& unblocked_mutex;
unsigned& unblocked_count;
void operator=(simple_writing_thread&);
public:
simple_writing_thread(boost::shared_mutex& rwm_,
boost::mutex& finish_mutex_,
boost::mutex& unblocked_mutex_,
unsigned& unblocked_count_):
rwm(rwm_),finish_mutex(finish_mutex_),
unblocked_mutex(unblocked_mutex_),unblocked_count(unblocked_count_)
{}
void operator()()
{
boost::unique_lock<boost::shared_mutex> lk(rwm);
{
boost::mutex::scoped_lock ulk(unblocked_mutex);
++unblocked_count;
}
boost::mutex::scoped_lock flk(finish_mutex);
}
};
}
void test_if_other_thread_has_write_lock_try_lock_shared_returns_false()
{
boost::shared_mutex rw_mutex;
boost::mutex finish_mutex;
boost::mutex unblocked_mutex;
unsigned unblocked_count=0;
boost::mutex::scoped_lock finish_lock(finish_mutex);
boost::thread writer(simple_writing_thread(rw_mutex,finish_mutex,unblocked_mutex,unblocked_count));
boost::this_thread::sleep(boost::posix_time::seconds(1));
CHECK_LOCKED_VALUE_EQUAL(unblocked_mutex,unblocked_count,1u);
bool const try_succeeded=rw_mutex.try_lock_shared();
BOOST_CHECK(!try_succeeded);
if(try_succeeded)
{
rw_mutex.unlock_shared();
}
finish_lock.unlock();
writer.join();
}
void test_if_no_thread_has_lock_try_lock_shared_returns_true()
{
boost::shared_mutex rw_mutex;
bool const try_succeeded=rw_mutex.try_lock_shared();
BOOST_CHECK(try_succeeded);
if(try_succeeded)
{
rw_mutex.unlock_shared();
}
}
namespace
{
class simple_reading_thread
{
boost::shared_mutex& rwm;
boost::mutex& finish_mutex;
boost::mutex& unblocked_mutex;
unsigned& unblocked_count;
void operator=(simple_reading_thread&);
public:
simple_reading_thread(boost::shared_mutex& rwm_,
boost::mutex& finish_mutex_,
boost::mutex& unblocked_mutex_,
unsigned& unblocked_count_):
rwm(rwm_),finish_mutex(finish_mutex_),
unblocked_mutex(unblocked_mutex_),unblocked_count(unblocked_count_)
{}
void operator()()
{
boost::shared_lock<boost::shared_mutex> lk(rwm);
{
boost::mutex::scoped_lock ulk(unblocked_mutex);
++unblocked_count;
}
boost::mutex::scoped_lock flk(finish_mutex);
}
};
}
void test_if_other_thread_has_shared_lock_try_lock_shared_returns_true()
{
boost::shared_mutex rw_mutex;
boost::mutex finish_mutex;
boost::mutex unblocked_mutex;
unsigned unblocked_count=0;
boost::mutex::scoped_lock finish_lock(finish_mutex);
boost::thread writer(simple_reading_thread(rw_mutex,finish_mutex,unblocked_mutex,unblocked_count));
boost::thread::sleep(delay(1));
CHECK_LOCKED_VALUE_EQUAL(unblocked_mutex,unblocked_count,1u);
bool const try_succeeded=rw_mutex.try_lock_shared();
BOOST_CHECK(try_succeeded);
if(try_succeeded)
{
rw_mutex.unlock_shared();
}
finish_lock.unlock();
writer.join();
}
void test_timed_lock_shared_times_out_if_write_lock_held()
{
boost::shared_mutex rw_mutex;
boost::mutex finish_mutex;
boost::mutex unblocked_mutex;
unsigned unblocked_count=0;
boost::mutex::scoped_lock finish_lock(finish_mutex);
boost::thread writer(simple_writing_thread(rw_mutex,finish_mutex,unblocked_mutex,unblocked_count));
boost::thread::sleep(delay(1));
CHECK_LOCKED_VALUE_EQUAL(unblocked_mutex,unblocked_count,1u);
boost::system_time const start=boost::get_system_time();
boost::system_time const timeout=start+boost::posix_time::milliseconds(2000);
boost::posix_time::milliseconds const timeout_resolution(20);
bool const timed_lock_succeeded=rw_mutex.timed_lock_shared(timeout);
BOOST_CHECK((timeout-timeout_resolution)<boost::get_system_time());
BOOST_CHECK(!timed_lock_succeeded);
if(timed_lock_succeeded)
{
rw_mutex.unlock_shared();
}
finish_lock.unlock();
writer.join();
}
boost::unit_test_framework::test_suite* init_unit_test_suite(int, char*[])
{
boost::unit_test_framework::test_suite* test =
BOOST_TEST_SUITE("Boost.Threads: shared_mutex test suite");
test->add(BOOST_TEST_CASE(&test_only_one_upgrade_lock_permitted));
test->add(BOOST_TEST_CASE(&test_can_lock_upgrade_if_currently_locked_shared));
test->add(BOOST_TEST_CASE(&test_if_other_thread_has_write_lock_try_lock_shared_returns_false));
test->add(BOOST_TEST_CASE(&test_if_no_thread_has_lock_try_lock_shared_returns_true));
test->add(BOOST_TEST_CASE(&test_if_other_thread_has_shared_lock_try_lock_shared_returns_true));
test->add(BOOST_TEST_CASE(&test_timed_lock_shared_times_out_if_write_lock_held));
return test;
}
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