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mutexSpinlockImpl.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 mutexSpinlockImpl.cxx
10 * @author drose
11 * @date 2006-04-11
12 */
13
14#include "selectThreadImpl.h"
15
16#ifdef MUTEX_SPINLOCK
17
18#include "mutexSpinlockImpl.h"
19
20#if defined(__i386__) || defined(__x86_64) || defined(_M_IX86) || defined(_M_X64)
21#include <emmintrin.h>
22#define PAUSE() _mm_pause()
23#else
24#define PAUSE()
25#endif
26
27/**
28 *
29 */
30void MutexSpinlockImpl::
31do_lock() {
32 // Loop until we changed the flag from 0 to 1 (and it wasn't already 1).
33 while (_flag.test_and_set(std::memory_order_acquire)) {
34 PAUSE();
35 }
36}
37
38#endif // MUTEX_SPINLOCK
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.