Export of internal Abseil changes.

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2c12ae8d6cbb8cbeb3ff446393578dd0d6d0cf8c by Andy Getzendanner <durandal@google.com>:

Fix printf POSIX reference link to point at printf(3) (the C API) instead of printf(1) (the shell utility).

PiperOrigin-RevId: 231719473

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a36b3a0e539b5ca2033bb25438aa325ac84a285a by CJ Johnson <johnsoncj@google.com>:

Fixes "correct" but poor semantics `allocator_and_tag_` initializations in InlinedVector to the proper version that gets a reference/const reference to allocator_type

PiperOrigin-RevId: 231691608

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de5eca5c7146a1e4692a201804817d98354d20ec by CJ Johnson <johnsoncj@google.com>:

Removes pathologically deleted move constructor and assignment operator from benchmark test type

PiperOrigin-RevId: 231680297

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b2b52859e5f0e14a25047e528c8163b12ea9ca32 by Matt Armstrong <marmstrong@google.com>:

Assert on elapsed time, not absolute time.

This is a cosmetic change that aims to make
test failures clearer.  Human readers no longer
need to do as much mental math to deduce the
magnitude of the failure.  It does not change the
semantics of the test assertions.

PiperOrigin-RevId: 231644805
GitOrigin-RevId: 2c12ae8d6cbb8cbeb3ff446393578dd0d6d0cf8c
Change-Id: Ic121a26a7a6bb7441da6a8c1d7797bee4f705fdc

2 files changed, 14 insertions, 6 deletions

diff --git a/absl/synchronization/internal/per_thread_sem_test.cc b/absl/synchronization/internal/per_thread_sem_test.cc
index c29d840..81cbe95 100644
--- a/absl/synchronization/internal/per_thread_sem_test.cc
+++ b/absl/synchronization/internal/per_thread_sem_test.cc
@@ -152,12 +152,16 @@ TEST_F(PerThreadSemTest, WithTimeout) {
 }
 
 TEST_F(PerThreadSemTest, Timeouts) {
-  absl::Time timeout = absl::Now() + absl::Milliseconds(50);
+  const absl::Duration delay = absl::Milliseconds(50);
+  const absl::Time start = absl::Now();
+  EXPECT_FALSE(Wait(start + delay));
+  const absl::Duration elapsed = absl::Now() - start;
   // Allow for a slight early return, to account for quality of implementation
   // issues on various platforms.
   const absl::Duration slop = absl::Microseconds(200);
-  EXPECT_FALSE(Wait(timeout));
-  EXPECT_LE(timeout, absl::Now() + slop);
+  EXPECT_LE(delay - slop, elapsed)
+      << "Wait returned " << delay - elapsed
+      << " early (with " << slop << " slop), start time was " << start;
 
   absl::Time negative_timeout = absl::UnixEpoch() - absl::Milliseconds(100);
   EXPECT_FALSE(Wait(negative_timeout));
diff --git a/absl/synchronization/notification_test.cc b/absl/synchronization/notification_test.cc
index d8708d5..95bde0b 100644
--- a/absl/synchronization/notification_test.cc
+++ b/absl/synchronization/notification_test.cc
@@ -72,12 +72,16 @@ static void BasicTests(bool notify_before_waiting, Notification* notification) {
   EXPECT_FALSE(notification->WaitForNotificationWithDeadline(absl::Now()));
 
   const absl::Duration delay = absl::Milliseconds(50);
+  const absl::Time start = absl::Now();
+  EXPECT_FALSE(notification->WaitForNotificationWithTimeout(delay));
+  const absl::Duration elapsed = absl::Now() - start;
+
   // Allow for a slight early return, to account for quality of implementation
   // issues on various platforms.
   const absl::Duration slop = absl::Microseconds(200);
-  absl::Time start = absl::Now();
-  EXPECT_FALSE(notification->WaitForNotificationWithTimeout(delay));
-  EXPECT_LE(start + delay, absl::Now() + slop);
+  EXPECT_LE(delay - slop, elapsed)
+      << "WaitForNotificationWithTimeout returned " << delay - elapsed
+      << " early (with " << slop << " slop), start time was " << start;
 
   ThreadSafeCounter ready_counter;
   ThreadSafeCounter done_counter;