Panda3D

mutexSimpleImpl.h
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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 mutexSimpleImpl.h
10 * @author drose
11 * @date 2007-06-19
12 */
13
14 #ifndef MUTEXSIMPLEIMPL_H
15 #define MUTEXSIMPLEIMPL_H
16
17 #include "pandabase.h"
18 #include "selectThreadImpl.h"
19
20 #ifdef THREAD_SIMPLE_IMPL
21
22 #include "blockerSimple.h"
23 #include "threadSimpleImpl.h"
24
25 /**
26 * This is the mutex implementation for the simple, simulated threads case.
27 * It's designed to be as lightweight as possible, of course. This
28 * implementation simply yields the thread when the mutex would block.
29 *
30 * We can't define this class in dtoolbase along with the other mutex
31 * implementations, because this implementation requires knowing about the
32 * SimpleThreadManager. This complicates the MutexDirect and MutexDebug
33 * definitions (we have to define a MutexImpl, for code before pipeline to use
34 * --which maps to MutexDummyImpl--and a MutexTrueImpl, for code after
35 * pipeline to use--which maps to this class, MutexSimpleImpl).
36 */
37 class EXPCL_PANDA_PIPELINE MutexSimpleImpl : public BlockerSimple {
38 public:
39 constexpr MutexSimpleImpl() = default;
40
41 INLINE void lock();
42 INLINE bool try_lock();
43 INLINE void unlock();
44 INLINE void unlock_quietly();
45
46 private:
47 void do_lock();
48 void do_unlock();
49 void do_unlock_quietly();
50
51 friend class ThreadSimpleManager;
52 };
53
54 #include "mutexSimpleImpl.I"
55
56 #endif // THREAD_SIMPLE_IMPL
57
58 #endif
blockerSimple.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
mutexSimpleImpl.I
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pandabase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
selectThreadImpl.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
threadSimpleImpl.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.