// Copyright (c) 2020 Can Boluk and contributors of the VTIL Project   
// All rights reserved.   
//    
// Redistribution and use in source and binary forms, with or without   
// modification, are permitted provided that the following conditions are met: 
//    
// 1. Redistributions of source code must retain the above copyright notice,   
//    this list of conditions and the following disclaimer.   
// 2. Redistributions in binary form must reproduce the above copyright   
//    notice, this list of conditions and the following disclaimer in the   
//    documentation and/or other materials provided with the distribution.   
// 3. Neither the name of VTIL Project nor the names of its contributors
//    may be used to endorse or promote products derived from this software 
//    without specific prior written permission.   
//    
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE   
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE   
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR   
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF   
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS   
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN   
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  
// POSSIBILITY OF SUCH DAMAGE.        
//
#include "thread_identifier.hpp"

#if _WIN32 || _WIN64
	#include <intrin.h>
#else
	#include <unistd.h>
	#include <sys/syscall.h>
#endif

namespace vtil
{
	// Returns the thread identifier in a platform independent way,
	// used instead of std::thread::get_id() as conversion to an integer
	// requires std::hash...
	//
	tid_t get_thread_id()
	{
#if _WIN32 || _WIN64
		static_assert( sizeof( tid_t ) == 8, "Thread identifier must be defined as a quadword." );

#ifdef _WIN64
		return __readgsqword(0x48);
#else
		return __readfsqword(0x24);
#endif

#else
		return ( tid_t ) syscall( SYS_gettid );
#endif
	}
};