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/*
* Copyright (C) 2018 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef WSREP_CONDITION_VARIABLE_HPP
#define WSREP_CONDITION_VARIABLE_HPP
#include "compiler.hpp"
#include "lock.hpp"
#include <cstdlib>
namespace wsrep
{
class condition_variable
{
public:
condition_variable() { }
virtual ~condition_variable() { }
virtual void notify_one() = 0;
virtual void notify_all() = 0;
virtual void wait(wsrep::unique_lock<wsrep::mutex>& lock) = 0;
private:
condition_variable(const condition_variable&);
condition_variable& operator=(const condition_variable&);
};
// Default pthreads based condition variable implementation
class default_condition_variable : public condition_variable
{
public:
default_condition_variable()
: cond_()
{
if (pthread_cond_init(&cond_, 0))
{
throw wsrep::runtime_error("Failed to initialized condvar");
}
}
~default_condition_variable() WSREP_OVERRIDE
{
if (pthread_cond_destroy(&cond_))
{
::abort();
}
}
void notify_one() WSREP_OVERRIDE
{
(void)pthread_cond_signal(&cond_);
}
void notify_all() WSREP_OVERRIDE
{
(void)pthread_cond_broadcast(&cond_);
}
void wait(wsrep::unique_lock<wsrep::mutex>& lock) WSREP_OVERRIDE
{
if (pthread_cond_wait(
&cond_,
reinterpret_cast<pthread_mutex_t*>(lock.mutex()->native())))
{
throw wsrep::runtime_error("Cond wait failed");
}
}
private:
pthread_cond_t cond_;
};
}
#endif // WSREP_CONDITION_VARIABLE_HPP
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