1/* Copyright (c) 2009, Google Inc.
2 * All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * ---
31 * This file is a Posix-specific part of spinlock_internal.cc
32 */
33
34#include <config.h>
35#include <errno.h>
36#ifdef HAVE_SCHED_H
37#include <sched.h>      /* For sched_yield() */
38#endif
39#include <time.h>       /* For nanosleep() */
40
41namespace base {
42namespace internal {
43
44void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop) {
45  int save_errno = errno;
46  if (loop == 0) {
47  } else if (loop == 1) {
48    sched_yield();
49  } else {
50    struct timespec tm;
51    tm.tv_sec = 0;
52    tm.tv_nsec = base::internal::SuggestedDelayNS(loop);
53    nanosleep(&tm, NULL);
54  }
55  errno = save_errno;
56}
57
58void SpinLockWake(volatile Atomic32 *w, bool all) {
59}
60
61} // namespace internal
62} // namespace base
63