/usr/include/SFML/System/Thread.h is in libcsfml-dev 2.4-2.
This file is owned by root:root, with mode 0o644.
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//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
#ifndef SFML_THREAD_H
#define SFML_THREAD_H
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/System/Export.h>
#include <SFML/System/Types.h>
////////////////////////////////////////////////////////////
/// \brief Create a new thread from a function pointer
///
/// Note: this does *not* run the thread, use sfThread_launch.
///
/// \param function Entry point of the thread
/// \param userData Custom data to pass to the thread function
///
/// \return A new sfThread object
///
////////////////////////////////////////////////////////////
CSFML_SYSTEM_API sfThread* sfThread_create(void (*function)(void*), void* userData);
////////////////////////////////////////////////////////////
/// \brief Destroy a thread
///
/// This function calls sfThread_wait, so that the internal thread
/// cannot survive after the sfThread object is destroyed.
///
/// \param thread Thread to destroy
///
////////////////////////////////////////////////////////////
CSFML_SYSTEM_API void sfThread_destroy(sfThread* thread);
////////////////////////////////////////////////////////////
/// \brief Run a thread
///
/// This function starts the entry point passed to the
/// thread's constructor, and returns immediately.
/// After this function returns, the thread's function is
/// running in parallel to the calling code.
///
/// \param thread Thread object
///
////////////////////////////////////////////////////////////
CSFML_SYSTEM_API void sfThread_launch(sfThread* thread);
////////////////////////////////////////////////////////////
/// \brief Wait until a thread finishes
///
/// This function will block the execution until the
/// thread's function ends.
/// Warning: if the thread function never ends, the calling
/// thread will block forever.
/// If this function is called from its owner thread, it
/// returns without doing anything.
///
/// \param thread Thread object
///
////////////////////////////////////////////////////////////
CSFML_SYSTEM_API void sfThread_wait(sfThread* thread);
////////////////////////////////////////////////////////////
/// \brief Terminate a thread
///
/// This function immediately stops the thread, without waiting
/// for its function to finish.
/// Terminating a thread with this function is not safe,
/// and can lead to local variables not being destroyed
/// on some operating systems. You should rather try to make
/// the thread function terminate by itself.
///
/// \param thread Thread object
///
////////////////////////////////////////////////////////////
CSFML_SYSTEM_API void sfThread_terminate(sfThread* thread);
#endif // SFML_THREAD_H
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