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/*
* Copyright (C) 2019 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/>.
*/
/** @file thread_service.hpp
*
* Service interface for threads and synchronization primitives.
* The purpose of this interface is to provider provider implementations
* means to integrate with application thread implementation.
*
* Interface is designed to resemble POSIX threads, mutexes and
* condition variables.
*/
#ifndef WSREP_THREAD_SERVICE_HPP
#define WSREP_THREAD_SERVICE_HPP
#include <cstddef> // size_t
#include "compiler.hpp"
struct timespec;
struct sched_param;
namespace wsrep
{
class thread_service
{
public:
thread_service() : exit() { }
virtual ~thread_service() { }
struct thread_key { };
struct thread { };
struct mutex_key { };
struct mutex { };
struct cond_key { };
struct cond { };
/**
* Method will be called before library side thread
* service initialization.
*/
virtual int before_init() = 0;
/**
* Method will be called after library side thread service
* has been initialized.
*/
virtual int after_init() = 0;
/* Thread */
virtual const thread_key* create_thread_key(const char* name) WSREP_NOEXCEPT
= 0;
virtual int create_thread(const thread_key*, thread**,
void* (*fn)(void*), void*) WSREP_NOEXCEPT
= 0;
virtual int detach(thread*) WSREP_NOEXCEPT = 0;
virtual int equal(thread*, thread*) WSREP_NOEXCEPT = 0;
/*
* This unlike others is a function pointer to
* avoid having C++ methods on thread exit codepath.
*/
WSREP_NORETURN void (*exit)(thread*, void* retval);
virtual int join(thread*, void** retval) WSREP_NOEXCEPT = 0;
virtual thread* self() WSREP_NOEXCEPT = 0;
virtual int setschedparam(thread*, int,
const struct sched_param*) WSREP_NOEXCEPT
= 0;
virtual int getschedparam(thread*, int*, struct sched_param*) WSREP_NOEXCEPT
= 0;
/* Mutex */
virtual const mutex_key* create_mutex_key(const char* name) WSREP_NOEXCEPT
= 0;
virtual mutex* init_mutex(const mutex_key*, void*, size_t) WSREP_NOEXCEPT = 0;
virtual int destroy(mutex*) WSREP_NOEXCEPT = 0;
virtual int lock(mutex*) WSREP_NOEXCEPT = 0;
virtual int trylock(mutex*) WSREP_NOEXCEPT = 0;
virtual int unlock(mutex*) WSREP_NOEXCEPT = 0;
/* Condition variable */
virtual const cond_key* create_cond_key(const char* name) WSREP_NOEXCEPT = 0;
virtual cond* init_cond(const cond_key*, void*, size_t) WSREP_NOEXCEPT = 0;
virtual int destroy(cond*) WSREP_NOEXCEPT = 0;
virtual int wait(cond*, mutex*) WSREP_NOEXCEPT = 0;
virtual int timedwait(cond*, mutex*, const struct timespec*) WSREP_NOEXCEPT
= 0;
virtual int signal(cond*) WSREP_NOEXCEPT = 0;
virtual int broadcast(cond*) WSREP_NOEXCEPT = 0;
};
} // namespace wsrep
#endif // WSREP_THREAD_SERVICE_HPP
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