base/profiler/tracked_time_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Test of classes in tracked_time.cc
   6
   7 #include "base/profiler/tracked_time.h"
   8 #include "base/time/time.h"
   9 #include "base/tracked_objects.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 namespace tracked_objects {
  13
  14 TEST(TrackedTimeTest, TrackedTimerMilliseconds) {
  15   // First make sure we basicallly transfer simple milliseconds values as
  16   // expected.  Most critically, things should not become null.
  17   int32 kSomeMilliseconds = 243;  // Some example times.
  18   int64 kReallyBigMilliseconds = (1LL << 35) + kSomeMilliseconds;
  19
  20   TrackedTime some = TrackedTime() +
  21       Duration::FromMilliseconds(kSomeMilliseconds);
  22   EXPECT_EQ(kSomeMilliseconds, (some - TrackedTime()).InMilliseconds());
  23   EXPECT_FALSE(some.is_null());
  24
  25   // Now create a big time, to check that it is wrapped modulo 2^32.
  26   base::TimeTicks big = base::TimeTicks() +
  27       base::TimeDelta::FromMilliseconds(kReallyBigMilliseconds);
  28   EXPECT_EQ(kReallyBigMilliseconds, (big - base::TimeTicks()).InMilliseconds());
  29
  30   TrackedTime wrapped_big(big);
  31   // Expect wrapping at 32 bits.
  32   EXPECT_EQ(kSomeMilliseconds, (wrapped_big - TrackedTime()).InMilliseconds());
  33 }
  34
  35 TEST(TrackedTimeTest, TrackedTimerDuration) {
  36   int kFirstMilliseconds = 793;
  37   int kSecondMilliseconds = 14889;
  38
  39   Duration first = Duration::FromMilliseconds(kFirstMilliseconds);
  40   Duration second = Duration::FromMilliseconds(kSecondMilliseconds);
  41
  42   EXPECT_EQ(kFirstMilliseconds, first.InMilliseconds());
  43   EXPECT_EQ(kSecondMilliseconds, second.InMilliseconds());
  44
  45   Duration sum = first + second;
  46   EXPECT_EQ(kFirstMilliseconds + kSecondMilliseconds, sum.InMilliseconds());
  47 }
  48
  49 TEST(TrackedTimeTest, TrackedTimerVsTimeTicks) {
  50   // Make sure that our 32 bit timer is aligned with the TimeTicks() timer.
  51
  52   // First get a 64 bit timer (which should not be null).
  53   base::TimeTicks ticks_before = base::TimeTicks::Now();
  54   EXPECT_FALSE(ticks_before.is_null());
  55
  56   // Then get a 32 bit timer that can be be null when it wraps.
  57   TrackedTime now = TrackedTime::Now();
  58
  59   // Then get a bracketing time.
  60   base::TimeTicks ticks_after = base::TimeTicks::Now();
  61   EXPECT_FALSE(ticks_after.is_null());
  62
  63   // Now make sure that we bracketed our tracked time nicely.
  64   Duration before = now - TrackedTime(ticks_before);
  65   EXPECT_LE(0, before.InMilliseconds());
  66   Duration after = now - TrackedTime(ticks_after);
  67   EXPECT_GE(0, after.InMilliseconds());
  68 }
  69
  70 TEST(TrackedTimeTest, TrackedTimerDisabled) {
  71   // Check to be sure disabling the collection of data induces a null time
  72   // (which we know will return much faster).
  73   if (!ThreadData::InitializeAndSetTrackingStatus(ThreadData::DEACTIVATED))
  74     return;
  75   // Since we disabled tracking, we should get a null response.
  76   TrackedTime track_now = ThreadData::Now();
  77   EXPECT_TRUE(track_now.is_null());
  78 }
  79
  80 TEST(TrackedTimeTest, TrackedTimerEnabled) {
  81   if (!ThreadData::InitializeAndSetTrackingStatus(
  82       ThreadData::PROFILING_CHILDREN_ACTIVE))
  83     return;
  84   // Make sure that when we enable tracking, we get a real timer result.
  85
  86   // First get a 64 bit timer (which should not be null).
  87   base::TimeTicks ticks_before = base::TimeTicks::Now();
  88   EXPECT_FALSE(ticks_before.is_null());
  89
  90   // Then get a 32 bit timer that can be null when it wraps.
  91   // Crtical difference from  the TrackedTimerVsTimeTicks test, is that we use
  92   // ThreadData::Now().  It can sometimes return the null time.
  93   TrackedTime now = ThreadData::Now();
  94
  95   // Then get a bracketing time.
  96   base::TimeTicks ticks_after = base::TimeTicks::Now();
  97   EXPECT_FALSE(ticks_after.is_null());
  98
  99   // Now make sure that we bracketed our tracked time nicely.
 100   Duration before = now - TrackedTime(ticks_before);
 101   EXPECT_LE(0, before.InMilliseconds());
 102   Duration after = now - TrackedTime(ticks_after);
 103   EXPECT_GE(0, after.InMilliseconds());
 104 }
 105
 106 }  // namespace tracked_objects