Panda3D
configVariableFilename.cxx
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1 /**
2  * PANDA 3D SOFTWARE
3  * Copyright (c) Carnegie Mellon University. All rights reserved.
4  *
5  * All use of this software is subject to the terms of the revised BSD
6  * license. You should have received a copy of this license along
7  * with this source code in a file named "LICENSE."
8  *
9  * @file configVariableFilename.cxx
10  * @author drose
11  * @date 2004-11-22
12  */
13 
14 #include "configVariableFilename.h"
15 #include "executionEnvironment.h"
16 
17 /**
18  * Recopies the config variable into the Filename for returning its value.
19  */
20 void ConfigVariableFilename::
21 reload_cache() {
22  // NB. MSVC doesn't guarantee that this mutex is initialized in a
23  // thread-safe manner. But chances are that the first time this is called
24  // is at static init time, when there is no risk of data races.
25  static MutexImpl lock;
26  lock.lock();
27 
28  // We check again for cache validity since another thread may have beaten
29  // us to the punch while we were waiting for the lock.
30  if (!is_cache_valid(_local_modified)) {
31  nassertv(_core != nullptr);
32  const ConfigDeclaration *decl = _core->get_declaration(0);
33 
34  _cache = decl->get_filename_value();
35  mark_cache_valid(_local_modified);
36  }
37  lock.unlock();
38 }
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
Filename get_filename_value() const
Interprets the string value as a filename and returns it, with any variables expanded.
A fake mutex implementation for single-threaded applications that don't need any synchronization cont...
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
A single declaration of a config variable, typically defined as one line in a .prc file,...