/usr/include/flext/lockfree/prefix.hpp is in pd-flext-dev 0.6.0+git20161101.1.01318a94-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (C) 2007 Tim Blechmann & Thomas Grill
//
// This program 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.
//
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
// $Revision$
// $LastChangedRevision$
// $LastChangedDate$
// $LastChangedBy$
#ifndef __LOCKFREE_PREFIX_H
#define __LOCKFREE_PREFIX_H
#include <cassert>
#ifdef USE_ATOMIC_OPS
#define AO_REQUIRE_CAS
#define AO_USE_PENTIUM4_INSTRS
extern "C" {
#include <atomic_ops.h>
}
#endif
#ifdef _WIN32
#include <windows.h>
#endif
#ifdef __APPLE__
#include <libkern/OSAtomic.h>
#else
#if defined(__GLIBCPP__) || defined(__GLIBCXX__)
#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
#include <ext/atomicity.h>
#else
#include <bits/atomicity.h>
#endif
#endif
#endif
#if defined(_MSC_VER)
// \note: Must use /Oi option for VC++ to enable intrinsics
extern "C" {
void __cdecl _ReadWriteBarrier();
LONG __cdecl _InterlockedCompareExchange(LONG volatile* Dest,LONG Exchange, LONG Comp);
}
#endif
#endif /* __LOCKFREE_PREFIX_H */
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