47 lines
1.5 KiB
C++
47 lines
1.5 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 configVariableFilename.cxx
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* @author drose
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* @date 2004-11-22
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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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* Recopies the config variable into the Filename for 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.lock();
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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 != nullptr);
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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.unlock();
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}
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