75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/**
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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 selectThreadImpl.h
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* @author drose
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* @date 2002-08-09
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*/
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#ifndef SELECTTHREADIMPL_H
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#define SELECTTHREADIMPL_H
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#include "dtoolbase.h"
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/*
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* This file decides which of the core implementations of the various
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* threading and locking implementations we should use, based on platform
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* andor available libraries. This file, along with mutexImpl.h and the
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* various Mutex implementation classes, are defined in dtool so that some
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* form of critical-section protection will be available to view low-level
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* classes like TypeRegistry. Most of the rest of the threading and
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* synchronization classes are defined in pandasrcexpress.
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*/
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// This keyword should be used to mark any variable which is possibly volatile
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// because multiple threads might contend on it, unprotected by a mutex. It
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// will be defined out in the non-threaded case. Other uses for volatile (dma
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// buffers, for instance) should use the regular volatile keyword.
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#define TVOLATILE volatile
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#if !defined(HAVE_THREADS) || defined(CPPPARSER)
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// With threading disabled, use the do-nothing implementation.
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#define THREAD_DUMMY_IMPL 1
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// And the TVOLATILE keyword means nothing in the absence of threads.
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#undef TVOLATILE
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#define TVOLATILE
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#elif defined(SIMPLE_THREADS)
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// Use the simulated threading library.
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#define THREAD_SIMPLE_IMPL 1
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#undef TVOLATILE
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#define TVOLATILE
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#elif defined(WIN32_VC)
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// In Windows, use the native threading library.
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#define THREAD_WIN32_IMPL 1
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#elif defined(HAVE_POSIX_THREADS)
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// Posix threads are nice.
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#define THREAD_POSIX_IMPL 1
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#else
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// This is a configuration error. For some reason, HAVE_THREADS is defined
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// but we don't have any way to implement it.
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#error No thread implementation defined for platform.
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#endif
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// Let's also factor out some of the other configuration variables.
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#if defined(DO_PIPELINING) && defined(HAVE_THREADS)
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#define THREADED_PIPELINE 1
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#else
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#undef THREADED_PIPELINE
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#endif
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#endif
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