/usr/include/podofo/base/util/PdfMutex.h is in libpodofo-dev 0.9.3-4.
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) 2008 by Dominik Seichter, Craig Ringer *
* domseichter@web.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Library 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 Library General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
* In addition, as a special exception, the copyright holders give *
* permission to link the code of portions of this program with the *
* OpenSSL library under certain conditions as described in each *
* individual source file, and distribute linked combinations *
* including the two. *
* You must obey the GNU General Public License in all respects *
* for all of the code used other than OpenSSL. If you modify *
* file(s) with this exception, you may extend this exception to your *
* version of the file(s), but you are not obligated to do so. If you *
* do not wish to do so, delete this exception statement from your *
* version. If you delete this exception statement from all source *
* files in the program, then also delete it here. *
***************************************************************************/
#ifndef PDF_PDFMUTEX_H
#define PDF_PDFMUTEX_H
#if defined(BUILDING_PODOFO)
/* Import the platform-specific implementation of PdfMutex */
#if defined(PODOFO_MULTI_THREAD)
# if defined(_WIN32)
# include "PdfMutexImpl_win32.h"
# else
# include "PdfMutexImpl_pthread.h"
# endif
#else
# include "PdfMutexImpl_noop.h"
#endif
namespace PoDoFo { namespace Util {
/**
* Reentrant mutex implemented by win32 CRITICAL_SECTION or pthread recursive mutex.
*
* If PODOFO_MULTI_THREAD is not set, all operations are no-ops and always succeed.
*
* A held (locked) PdfMutex may not be acquired (locked) by a thread other than
* the thread that currently holds it.
*
* The thread holding a PdfMutex may acquire it repeatedly. Every acquision must be matched
* by a release.
*
* When a PdfMutex is not held by any thread (ie it is newly allocated or has been released)
* then exactly one thread attempting to acquire it will succeed. If there is more than one
* thread trying to acquire a PdfMutex, which thread will succeed is undefined.
*
*/
class PdfMutex : public PdfMutexImpl
{
// This wrapper/extension class is provided so we can add platform-independent
// functionality and helpers if desired.
public:
PdfMutex() { }
~PdfMutex() { }
};
};};
#else // BUILDING_PODOFO
// Only a forward-declaration is available for PdfMutex for sources outside the
// PoDoFo library build its self. PdfMutex is not public API.
namespace PoDoFo { namespace Util { class PdfMutex; }; };
#endif
#endif
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