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// Copyright (C) 2010 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#include <sstream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <dlib/misc_api.h>
#include <dlib/threads.h>
#include "tester.h"
namespace
{
using namespace test;
using namespace dlib;
using namespace std;
logger dlog("test.read_write_mutex");
class read_write_mutex_tester : public tester, multithreaded_object
{
public:
read_write_mutex_tester (
) :
tester ("test_read_write_mutex",
"Runs tests on the read_write_mutex component.")
{
register_thread(*this, &read_write_mutex_tester::thread_write);
register_thread(*this, &read_write_mutex_tester::thread_write);
register_thread(*this, &read_write_mutex_tester::thread_write);
register_thread(*this, &read_write_mutex_tester::thread_readonly);
register_thread(*this, &read_write_mutex_tester::thread_readonly);
register_thread(*this, &read_write_mutex_tester::thread_readonly);
register_thread(*this, &read_write_mutex_tester::thread_readonly2);
register_thread(*this, &read_write_mutex_tester::thread_readonly2);
register_thread(*this, &read_write_mutex_tester::thread_readonly2);
}
read_write_mutex m;
dlib::mutex mut;
int num_write;
int num_read;
int max_read;
bool failure;
void thread_write ()
{
// do this so that the readonly threads can get into their loops first. This way
// we can see if the mutex lets many readers into their area
dlib::sleep(250);
for (int i = 0; i < 6; ++i)
{
auto_mutex lock(m);
mut.lock();
++num_write;
mut.unlock();
// only one write thread should ever be active at once
if (num_write != 1)
{
failure = true;
dlog << LERROR << "1";
}
dlib::sleep(300);
// only one write thread should ever be active at once
if (num_write != 1)
{
failure = true;
dlog << LERROR << "2";
}
mut.lock();
--num_write;
mut.unlock();
print_spinner();
}
dlog << LINFO << "exit thread_write()";
}
void do_readonly_stuff()
{
mut.lock();
++num_read;
max_read = max(num_read, max_read);
mut.unlock();
if (num_write != 0)
{
failure = true;
dlog << LERROR << "3";
}
dlib::sleep(300);
if (num_write != 0)
{
failure = true;
dlog << LERROR << "4";
}
mut.lock();
max_read = max(num_read, max_read);
--num_read;
mut.unlock();
print_spinner();
}
void thread_readonly ()
{
for (int i = 0; i < 6; ++i)
{
auto_mutex_readonly lock(m);
DLIB_TEST(lock.has_read_lock());
DLIB_TEST(!lock.has_write_lock());
do_readonly_stuff();
lock.lock_readonly();
DLIB_TEST(lock.has_read_lock());
DLIB_TEST(!lock.has_write_lock());
lock.unlock();
DLIB_TEST(!lock.has_read_lock());
DLIB_TEST(!lock.has_write_lock());
lock.lock_readonly();
DLIB_TEST(lock.has_read_lock());
DLIB_TEST(!lock.has_write_lock());
lock.lock_write();
DLIB_TEST(!lock.has_read_lock());
DLIB_TEST(lock.has_write_lock());
lock.lock_write();
DLIB_TEST(!lock.has_read_lock());
DLIB_TEST(lock.has_write_lock());
}
dlog << LINFO << "exit thread_readonly()";
}
void thread_readonly2 ()
{
for (int i = 0; i < 6; ++i)
{
m.lock_readonly();
auto_unlock_readonly unlock(m);
do_readonly_stuff();
}
dlog << LINFO << "exit thread_readonly2()";
}
void perform_test (
)
{
num_write = 0;
num_read = 0;
max_read = 0;
failure = false;
// doing this big block of weird stuff should have no effect.
{
m.unlock();
m.lock_readonly();
m.lock_readonly();
m.unlock();
m.unlock_readonly();
m.unlock();
m.unlock_readonly();
m.unlock();
m.unlock_readonly();
m.lock();
m.unlock_readonly();
m.unlock_readonly();
m.unlock();
}
// start up our testing threads
start();
// wait for the threads to finish
wait();
DLIB_TEST(failure == false);
DLIB_TEST_MSG(max_read == 6, "max_read: "<< max_read);
}
} a;
}
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