minetest/src/threads.h

/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef THREADS_HEADER
#define THREADS_HEADER

//
// Determine which threading APIs we will use
//
#if __cplusplus >= 201103L
	#define USE_CPP11_THREADS 1
#elif defined(_WIN32)
	#define USE_WIN_THREADS 1
#else
	#define USE_POSIX_THREADS 1
#endif

#if defined(_WIN32)
	// Prefer critical section API because std::mutex is much slower on Windows
	#define USE_WIN_MUTEX 1
#elif __cplusplus >= 201103L
	#define USE_CPP11_MUTEX 1
#else
	#define USE_POSIX_MUTEX 1
#endif

///////////////


#if USE_CPP11_THREADS
	#include <thread>
#elif USE_POSIX_THREADS
	#include <pthread.h>
#else
	#ifndef WIN32_LEAN_AND_MEAN
		#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
#endif

#include "threading/mutex.h"

//
// threadid_t, threadhandle_t
//
#if USE_CPP11_THREADS
	typedef std::thread::id threadid_t;
	typedef std::thread::native_handle_type threadhandle_t;
#elif USE_WIN_THREADS
	typedef DWORD threadid_t;
	typedef HANDLE threadhandle_t;
#elif USE_POSIX_THREADS
	typedef pthread_t threadid_t;
	typedef pthread_t threadhandle_t;
#endif

//
// ThreadStartFunc
//
#if USE_CPP11_THREADS || USE_POSIX_THREADS
	typedef void *ThreadStartFunc(void *param);
#elif defined(_WIN32_WCE)
	typedef DWORD ThreadStartFunc(LPVOID param);
#elif defined(_WIN32)
	typedef DWORD WINAPI ThreadStartFunc(LPVOID param);
#endif


inline threadid_t thr_get_current_thread_id()
{
#if USE_CPP11_THREADS
	return std::this_thread::get_id();
#elif USE_WIN_THREADS
	return GetCurrentThreadId();
#elif USE_POSIX_THREADS
	return pthread_self();
#endif
}

inline bool thr_compare_thread_id(threadid_t thr1, threadid_t thr2)
{
#if USE_POSIX_THREADS
	return pthread_equal(thr1, thr2);
#else
	return thr1 == thr2;
#endif
}

inline bool thr_is_current_thread(threadid_t thr)
{
	return thr_compare_thread_id(thr_get_current_thread_id(), thr);
}

#endif