| Austin Schuh | 745610d | 2015-09-06 18:19:50 -0700 | [diff] [blame^] | 1 | // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- |
| 2 | /* Copyright (c) 2009, Google Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are |
| 7 | * met: |
| 8 | * |
| 9 | * * Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * * Redistributions in binary form must reproduce the above |
| 12 | * copyright notice, this list of conditions and the following disclaimer |
| 13 | * in the documentation and/or other materials provided with the |
| 14 | * distribution. |
| 15 | * * Neither the name of Google Inc. nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived from |
| 17 | * this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | * |
| 31 | * --- |
| 32 | * This file is a Posix-specific part of spinlock_internal.cc |
| 33 | */ |
| 34 | |
| 35 | #include <config.h> |
| 36 | #include <errno.h> |
| 37 | #ifdef HAVE_SCHED_H |
| 38 | #include <sched.h> /* For sched_yield() */ |
| 39 | #endif |
| 40 | #include <time.h> /* For nanosleep() */ |
| 41 | |
| 42 | namespace base { |
| 43 | namespace internal { |
| 44 | |
| 45 | void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop) { |
| 46 | int save_errno = errno; |
| 47 | if (loop == 0) { |
| 48 | } else if (loop == 1) { |
| 49 | sched_yield(); |
| 50 | } else { |
| 51 | struct timespec tm; |
| 52 | tm.tv_sec = 0; |
| 53 | tm.tv_nsec = base::internal::SuggestedDelayNS(loop); |
| 54 | nanosleep(&tm, NULL); |
| 55 | } |
| 56 | errno = save_errno; |
| 57 | } |
| 58 | |
| 59 | void SpinLockWake(volatile Atomic32 *w, bool all) { |
| 60 | } |
| 61 | |
| 62 | } // namespace internal |
| 63 | } // namespace base |