Move base to DEPS

base/synchronization/spin_wait.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This file provides a macro ONLY for use in testing.
-// DO NOT USE IN PRODUCTION CODE.  There are much better ways to wait.
-
-// This code is very helpful in testing multi-threaded code, without depending
-// on almost any primitives.  This is especially helpful if you are testing
-// those primitive multi-threaded constructs.
-
-// We provide a simple one argument spin wait (for 1 second), and a generic
-// spin wait (for longer periods of time).
-
-#ifndef BASE_SYNCHRONIZATION_SPIN_WAIT_H_
-#define BASE_SYNCHRONIZATION_SPIN_WAIT_H_
-
-#include "base/threading/platform_thread.h"
-#include "base/time/time.h"
-
-// Provide a macro that will wait no longer than 1 second for an asynchronous
-// change is the value of an expression.
-// A typical use would be:
-//
-//   SPIN_FOR_1_SECOND_OR_UNTIL_TRUE(0 == f(x));
-//
-// The expression will be evaluated repeatedly until it is true, or until
-// the time (1 second) expires.
-// Since tests generally have a 5 second watch dog timer, this spin loop is
-// typically used to get the padding needed on a given test platform to assure
-// that the test passes, even if load varies, and external events vary.
-
-#define SPIN_FOR_1_SECOND_OR_UNTIL_TRUE(expression) \
-    SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(base::TimeDelta::FromSeconds(1), \
-                                     (expression))
-
-#define SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(delta, expression) do { \
-  base::TimeTicks start = base::TimeTicks::Now(); \
-  const base::TimeDelta kTimeout = delta; \
-    while (!(expression)) { \
-      if (kTimeout < base::TimeTicks::Now() - start) { \
-      EXPECT_LE((base::TimeTicks::Now() - start).InMilliseconds(), \
-                kTimeout.InMilliseconds()) << "Timed out"; \
-        break; \
-      } \
-      base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(50)); \
-    } \
-  } while (0)
-
-#endif  // BASE_SYNCHRONIZATION_SPIN_WAIT_H_