51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
// Filename: configVariableFilename.cxx
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// Created by: drose (22Nov04)
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//
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////////////////////////////////////////////////////////////////////
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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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////////////////////////////////////////////////////////////////////
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#include "configVariableFilename.h"
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#include "executionEnvironment.h"
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////////////////////////////////////////////////////////////////////
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// Function: ConfigVariableFilename::reload_cache
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// Access: Private
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// Description: Recopies the config variable into the Filename for
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// returning its value.
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////////////////////////////////////////////////////////////////////
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void ConfigVariableFilename::
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reload_cache() {
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// NB. MSVC doesn't guarantee that this mutex is initialized in a
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// thread-safe manner. But chances are that the first time this is called
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// is at static init time, when there is no risk of data races.
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static MutexImpl lock;
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lock.acquire();
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// We check again for cache validity since another thread may have beaten
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// us to the punch while we were waiting for the lock.
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if (!is_cache_valid(_local_modified)) {
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nassertv(_core != (ConfigVariableCore *)NULL);
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const ConfigDeclaration *decl = _core->get_declaration(0);
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const ConfigPage *page = decl->get_page();
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Filename page_filename(page->get_name());
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Filename page_dirname = page_filename.get_dirname();
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ExecutionEnvironment::shadow_environment_variable("THIS_PRC_DIR", page_dirname.to_os_specific());
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_cache = Filename::expand_from(decl->get_string_value());
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ExecutionEnvironment::clear_shadow("THIS_PRC_DIR");
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mark_cache_valid(_local_modified);
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}
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lock.release();
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}
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