59 lines
1.6 KiB
C
59 lines
1.6 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 mutexSimpleImpl.h
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* @author drose
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* @date 2007-06-19
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*/
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#ifndef MUTEXSIMPLEIMPL_H
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#define MUTEXSIMPLEIMPL_H
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#include "pandabase.h"
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#include "selectThreadImpl.h"
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#ifdef THREAD_SIMPLE_IMPL
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#include "blockerSimple.h"
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#include "threadSimpleImpl.h"
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/**
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* This is the mutex implementation for the simple, simulated threads case.
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* It's designed to be as lightweight as possible, of course. This
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* implementation simply yields the thread when the mutex would block.
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*
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* We can't define this class in dtoolbase along with the other mutex
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* implementations, because this implementation requires knowing about the
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* SimpleThreadManager. This complicates the MutexDirect and MutexDebug
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* definitions (we have to define a MutexImpl, for code before pipeline to use
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* --which maps to MutexDummyImpl--and a MutexTrueImpl, for code after
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* pipeline to use--which maps to this class, MutexSimpleImpl).
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*/
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class EXPCL_PANDA_PIPELINE MutexSimpleImpl : public BlockerSimple {
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public:
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constexpr MutexSimpleImpl() = default;
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INLINE void lock();
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INLINE bool try_lock();
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INLINE void unlock();
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INLINE void unlock_quietly();
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private:
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void do_lock();
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void do_unlock();
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void do_unlock_quietly();
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friend class ThreadSimpleManager;
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};
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#include "mutexSimpleImpl.I"
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#endif // THREAD_SIMPLE_IMPL
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#endif
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