65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file pmutex.h
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* @author cary
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* @date 1998-09-16
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*/
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#ifndef PMUTEX_H
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#define PMUTEX_H
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#include "pandabase.h"
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#include "mutexDebug.h"
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#include "mutexDirect.h"
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/**
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* A standard mutex, or mutual exclusion lock. Only one thread can hold
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* ("lock") a mutex at any given time; other threads trying to grab the mutex
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* will block until the holding thread releases it.
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*
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* The standard mutex is not reentrant: a thread may not attempt to lock it
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* twice. Although this may happen to work on some platforms (e.g. Win32),
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* it will not work on all platforms; on some platforms, a thread can deadlock
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* itself by attempting to lock the same mutex twice. If your code requires a
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* reentrant mutex, use the ReMutex class instead.
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*
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* This class inherits its implementation either from MutexDebug or
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* MutexDirect, depending on the definition of DEBUG_THREADS.
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*/
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#ifdef DEBUG_THREADS
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class EXPCL_PANDA_PIPELINE Mutex : public MutexDebug
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#else
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class EXPCL_PANDA_PIPELINE Mutex : public MutexDirect
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#endif // DEBUG_THREADS
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{
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PUBLISHED:
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INLINE Mutex();
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public:
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INLINE Mutex(const char *name);
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PUBLISHED:
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INLINE explicit Mutex(const std::string &name);
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Mutex(const Mutex ©) = delete;
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~Mutex() = default;
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void operator = (const Mutex ©) = delete;
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EXTENSION(bool acquire(bool blocking=true) const);
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EXTENSION(bool __enter__());
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EXTENSION(void __exit__(PyObject *, PyObject *, PyObject *));
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public:
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// This is a global mutex set aside for the purpose of protecting Notify
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// messages from being interleaved between threads.
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static Mutex _notify_mutex;
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};
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#include "pmutex.I"
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#endif
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