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/*
* Copyright © Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MIR_TEST_MULTITHREAD_HARNESS_H_
#define MIR_TEST_MULTITHREAD_HARNESS_H_
#include <condition_variable>
#include <mutex>
#include <gtest/gtest.h>
namespace mir
{
namespace testing
{
/* interface for main/controller thread to
synchronize system */
class SynchronizerController
{
public:
virtual ~SynchronizerController() {}
virtual void ensure_child_is_waiting() = 0;
virtual void activate_waiting_child() = 0;
virtual void kill_thread() = 0;
};
/* interface for spawned threads to interact with main thread */
class SynchronizerSpawned
{
public:
virtual ~SynchronizerSpawned() {}
virtual bool child_enter_wait() = 0;
virtual bool child_check_wait_request() = 0;
};
class Synchronizer : public SynchronizerController,
public SynchronizerSpawned
{
public:
Synchronizer ()
: paused(false),
pause_request(false),
kill(false)
{
};
~Synchronizer ()
{
};
void ensure_child_is_waiting()
{
std::unique_lock lk(sync_mutex);
pause_request = true;
while (!paused)
{
cv.wait(lk);
}
pause_request = false;
};
void activate_waiting_child()
{
{
std::unique_lock lk(sync_mutex);
paused = false;
}
cv.notify_all();
};
bool child_enter_wait()
{
std::unique_lock lk(sync_mutex);
paused = true;
cv.notify_all();
while (paused) {
cv.wait(lk);
}
return kill;
};
bool child_check_wait_request()
{
std::unique_lock lk(sync_mutex);
return pause_request;
};
void kill_thread()
{
std::unique_lock lk(sync_mutex);
kill = true;
};
private:
std::condition_variable cv;
std::mutex sync_mutex;
bool paused;
bool pause_request;
bool kill;
};
}
}
#endif /* MIR_TEST_MULTITHREAD_HARNESS_ */
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