Panda3D
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configVariableBool.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 configVariableBool.cxx
10 * @author drose
11 * @date 2004-10-20
12 */
13
14#include "configVariableBool.h"
15#include "mutexImpl.h"
16
17/**
18 * Refreshes the cached value.
19 */
20void ConfigVariableBool::
21reload_value() const {
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
26 // This needs to be a recursive mutex, because get_bool_word() may end up
27 // indirectly querying another bool config variable.
28 static ReMutexImpl lock;
29 lock.lock();
30
31 // We check again for cache validity since another thread may have beaten
32 // us to the punch while we were waiting for the lock.
33 if (!is_cache_valid(_local_modified)) {
34 _cache = get_bool_word(0);
35 mark_cache_valid(_local_modified);
36 }
37
38 lock.unlock();
39}
A fake mutex implementation for single-threaded applications that don't need any synchronization cont...
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.