Export of internal Abseil changes.

--
0925eb11f7730d5a1e538b9e6c2d1f8239f5fdc0 by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 250694613

--
4e1690e492a8399da1b1450ff5f21adf435fcef5 by Greg Falcon <gfalcon@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 250684222

--
c7281b44eb005c21d45bdc0b437e47c7787275bc by Derek Mauro <dmauro@google.com>:

Fix warnings on Xcode/clang.

PiperOrigin-RevId: 250552120

--
5ea3b1cfa759a7e6c70e7558f27c762baf818f7d by CJ Johnson <johnsoncj@google.com>:

Minor edits to InlinedVector benchmarks: Adds DoNotOptimize to the member functions of NontrivialType, removes unused template parameter for InlVec typeder

PiperOrigin-RevId: 250505482

--
7fe9c02b49121936c5b47034f20272a916111174 by Matt Kulukundis <kfm@google.com>:

Internal change.

PiperOrigin-RevId: 250376825

--
ad348c9c0eb37449874648e8544c56343c1dfaef by CJ Johnson <johnsoncj@google.com>:

Minor edits to InlinedVector benchmark

PiperOrigin-RevId: 250361830

--
55e8b411431e982059af73b160fa6bcef90e87f7 by CJ Johnson <johnsoncj@google.com>:

Switches use of allocator_traits to the Abseil backport to leverage existing bug fixes and workarounds

PiperOrigin-RevId: 250359321

--
b0edbe3218940128523e36388a31ff90df01a364 by CJ Johnson <johnsoncj@google.com>:

Updates exception safety test for InlinedVector to use TYPED_TEST (with fixtures) which increases the coverage without complicating the code.

PiperOrigin-RevId: 250359198

--
8ab55c9a8c191aabcb562cf1789f360eba0b1a81 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 250281509

--
dd8a67f4f9e5e8930457203c18205183b8306b5a by Abseil Team <absl-team@google.com>:

Change the suggestions for the non-strict Next/PrevWeekday() calls.

Previously we suggested `PrevWeekday(d, Weekday::thursday) + 7`
to get the _following_ Thursday if d is not already a Thursday,
but `NextWeekday(d - 1, Weekday::thursday)` is more intuitive,
and probably even a little faster.

Similarly for the _previous_ Thursday if d is not already a
Thursday, suggest `PrevWeekday(d + 1, Weekday::thursday)`
instead of `NextWeekday(d, Weekday::thursday) - 7`.

PiperOrigin-RevId: 249840844

--
4775dce26cdb0560011a5d1ecdc8e0c20f856911 by Abseil Team <absl-team@google.com>:

Change the DbgHelp lib pragma to use lowercase and an extension.

This matches the conventions used in the Windows SDK.

PiperOrigin-RevId: 249826229

--
cbc49e865f3715ebe1983307d4f02e50998b2958 by Abseil Team <absl-team@google.com>:

Introduce Abseil prefixed thread annotation macros.

PiperOrigin-RevId: 249825200

--
8e97c8dfbadb78743c2421b494398be25f632cb1 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 249737936

--
0d720538bc6af3e77ac19def27a4a0514c2800d2 by Abseil Team <absl-team@google.com>:

Tell CMake Abseil is a C++ project.

PiperOrigin-RevId: 249726509

--
20651845edf236757b3ffb3eaeff330af81be40a by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 249726377
GitOrigin-RevId: 0925eb11f7730d5a1e538b9e6c2d1f8239f5fdc0
Change-Id: I05d18d30ad4e9ace6b60a17d2dc6fd699643fe30

4 files changed, 369 insertions, 85 deletions

diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel
index c6f0e4d..5b7b295 100644
--- a/absl/base/BUILD.bazel
+++ b/absl/base/BUILD.bazel
@@ -69,6 +69,9 @@ cc_library(
 
 cc_library(
     name = "core_headers",
+    srcs = [
+        "internal/thread_annotations.h",
+    ],
     hdrs = [
         "attributes.h",
         "const_init.h",
@@ -385,7 +388,6 @@ cc_test(
     srcs = ["internal/endian_test.cc"],
     copts = ABSL_TEST_COPTS,
     deps = [
-        ":base",
         ":config",
         ":endian",
         "@com_google_googletest//:gtest_main",
diff --git a/absl/base/CMakeLists.txt b/absl/base/CMakeLists.txt
index b9f35bc..34bfba2 100644
--- a/absl/base/CMakeLists.txt
+++ b/absl/base/CMakeLists.txt
@@ -67,6 +67,7 @@ absl_cc_library(
     "optimization.h"
     "port.h"
     "thread_annotations.h"
+    "internal/thread_annotations.h"
   COPTS
     ${ABSL_DEFAULT_COPTS}
   DEPS
diff --git a/absl/base/internal/thread_annotations.h b/absl/base/internal/thread_annotations.h
new file mode 100644
index 0000000..4dab6a9
--- /dev/null
+++ b/absl/base/internal/thread_annotations.h
@@ -0,0 +1,271 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: thread_annotations.h
+// -----------------------------------------------------------------------------
+//
+// WARNING: This is a backwards compatible header and it will be removed after
+// the migration to prefixed thread annotations is finished; please include
+// "absl/base/thread_annotations.h".
+//
+// This header file contains macro definitions for thread safety annotations
+// that allow developers to document the locking policies of multi-threaded
+// code. The annotations can also help program analysis tools to identify
+// potential thread safety issues.
+//
+// These annotations are implemented using compiler attributes. Using the macros
+// defined here instead of raw attributes allow for portability and future
+// compatibility.
+//
+// When referring to mutexes in the arguments of the attributes, you should
+// use variable names or more complex expressions (e.g. my_object->mutex_)
+// that evaluate to a concrete mutex object whenever possible. If the mutex
+// you want to refer to is not in scope, you may use a member pointer
+// (e.g. &MyClass::mutex_) to refer to a mutex in some (unknown) object.
+
+#ifndef ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
+#define ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
+
+#if defined(__clang__)
+#define THREAD_ANNOTATION_ATTRIBUTE__(x)   __attribute__((x))
+#else
+#define THREAD_ANNOTATION_ATTRIBUTE__(x)   // no-op
+#endif
+
+// GUARDED_BY()
+//
+// Documents if a shared field or global variable needs to be protected by a
+// mutex. GUARDED_BY() allows the user to specify a particular mutex that
+// should be held when accessing the annotated variable.
+//
+// Although this annotation (and PT_GUARDED_BY, below) cannot be applied to
+// local variables, a local variable and its associated mutex can often be
+// combined into a small class or struct, thereby allowing the annotation.
+//
+// Example:
+//
+//   class Foo {
+//     Mutex mu_;
+//     int p1_ GUARDED_BY(mu_);
+//     ...
+//   };
+#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
+
+// PT_GUARDED_BY()
+//
+// Documents if the memory location pointed to by a pointer should be guarded
+// by a mutex when dereferencing the pointer.
+//
+// Example:
+//   class Foo {
+//     Mutex mu_;
+//     int *p1_ PT_GUARDED_BY(mu_);
+//     ...
+//   };
+//
+// Note that a pointer variable to a shared memory location could itself be a
+// shared variable.
+//
+// Example:
+//
+//   // `q_`, guarded by `mu1_`, points to a shared memory location that is
+//   // guarded by `mu2_`:
+//   int *q_ GUARDED_BY(mu1_) PT_GUARDED_BY(mu2_);
+#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+
+// ACQUIRED_AFTER() / ACQUIRED_BEFORE()
+//
+// Documents the acquisition order between locks that can be held
+// simultaneously by a thread. For any two locks that need to be annotated
+// to establish an acquisition order, only one of them needs the annotation.
+// (i.e. You don't have to annotate both locks with both ACQUIRED_AFTER
+// and ACQUIRED_BEFORE.)
+//
+// As with GUARDED_BY, this is only applicable to mutexes that are shared
+// fields or global variables.
+//
+// Example:
+//
+//   Mutex m1_;
+//   Mutex m2_ ACQUIRED_AFTER(m1_);
+#define ACQUIRED_AFTER(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
+
+#define ACQUIRED_BEFORE(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
+
+// EXCLUSIVE_LOCKS_REQUIRED() / SHARED_LOCKS_REQUIRED()
+//
+// Documents a function that expects a mutex to be held prior to entry.
+// The mutex is expected to be held both on entry to, and exit from, the
+// function.
+//
+// An exclusive lock allows read-write access to the guarded data member(s), and
+// only one thread can acquire a lock exclusively at any one time. A shared lock
+// allows read-only access, and any number of threads can acquire a shared lock
+// concurrently.
+//
+// Generally, non-const methods should be annotated with
+// EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with
+// SHARED_LOCKS_REQUIRED.
+//
+// Example:
+//
+//   Mutex mu1, mu2;
+//   int a GUARDED_BY(mu1);
+//   int b GUARDED_BY(mu2);
+//
+//   void foo() EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... }
+//   void bar() const SHARED_LOCKS_REQUIRED(mu1, mu2) { ... }
+#define EXCLUSIVE_LOCKS_REQUIRED(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
+
+#define SHARED_LOCKS_REQUIRED(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
+
+// LOCKS_EXCLUDED()
+//
+// Documents the locks acquired in the body of the function. These locks
+// cannot be held when calling this function (as Abseil's `Mutex` locks are
+// non-reentrant).
+#define LOCKS_EXCLUDED(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
+
+// LOCK_RETURNED()
+//
+// Documents a function that returns a mutex without acquiring it.  For example,
+// a public getter method that returns a pointer to a private mutex should
+// be annotated with LOCK_RETURNED.
+#define LOCK_RETURNED(x) \
+  THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
+
+// LOCKABLE
+//
+// Documents if a class/type is a lockable type (such as the `Mutex` class).
+#define LOCKABLE \
+  THREAD_ANNOTATION_ATTRIBUTE__(lockable)
+
+// SCOPED_LOCKABLE
+//
+// Documents if a class does RAII locking (such as the `MutexLock` class).
+// The constructor should use `LOCK_FUNCTION()` to specify the mutex that is
+// acquired, and the destructor should use `UNLOCK_FUNCTION()` with no
+// arguments; the analysis will assume that the destructor unlocks whatever the
+// constructor locked.
+#define SCOPED_LOCKABLE \
+  THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
+
+// EXCLUSIVE_LOCK_FUNCTION()
+//
+// Documents functions that acquire a lock in the body of a function, and do
+// not release it.
+#define EXCLUSIVE_LOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
+
+// SHARED_LOCK_FUNCTION()
+//
+// Documents functions that acquire a shared (reader) lock in the body of a
+// function, and do not release it.
+#define SHARED_LOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
+
+// UNLOCK_FUNCTION()
+//
+// Documents functions that expect a lock to be held on entry to the function,
+// and release it in the body of the function.
+#define UNLOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
+
+// EXCLUSIVE_TRYLOCK_FUNCTION() / SHARED_TRYLOCK_FUNCTION()
+//
+// Documents functions that try to acquire a lock, and return success or failure
+// (or a non-boolean value that can be interpreted as a boolean).
+// The first argument should be `true` for functions that return `true` on
+// success, or `false` for functions that return `false` on success. The second
+// argument specifies the mutex that is locked on success. If unspecified, this
+// mutex is assumed to be `this`.
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
+
+#define SHARED_TRYLOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
+
+// ASSERT_EXCLUSIVE_LOCK() / ASSERT_SHARED_LOCK()
+//
+// Documents functions that dynamically check to see if a lock is held, and fail
+// if it is not held.
+#define ASSERT_EXCLUSIVE_LOCK(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
+
+#define ASSERT_SHARED_LOCK(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_lock(__VA_ARGS__))
+
+// NO_THREAD_SAFETY_ANALYSIS
+//
+// Turns off thread safety checking within the body of a particular function.
+// This annotation is used to mark functions that are known to be correct, but
+// the locking behavior is more complicated than the analyzer can handle.
+#define NO_THREAD_SAFETY_ANALYSIS \
+  THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+
+//------------------------------------------------------------------------------
+// Tool-Supplied Annotations
+//------------------------------------------------------------------------------
+
+// TS_UNCHECKED should be placed around lock expressions that are not valid
+// C++ syntax, but which are present for documentation purposes.  These
+// annotations will be ignored by the analysis.
+#define TS_UNCHECKED(x) ""
+
+// TS_FIXME is used to mark lock expressions that are not valid C++ syntax.
+// It is used by automated tools to mark and disable invalid expressions.
+// The annotation should either be fixed, or changed to TS_UNCHECKED.
+#define TS_FIXME(x) ""
+
+// Like NO_THREAD_SAFETY_ANALYSIS, this turns off checking within the body of
+// a particular function.  However, this attribute is used to mark functions
+// that are incorrect and need to be fixed.  It is used by automated tools to
+// avoid breaking the build when the analysis is updated.
+// Code owners are expected to eventually fix the routine.
+#define NO_THREAD_SAFETY_ANALYSIS_FIXME  NO_THREAD_SAFETY_ANALYSIS
+
+// Similar to NO_THREAD_SAFETY_ANALYSIS_FIXME, this macro marks a GUARDED_BY
+// annotation that needs to be fixed, because it is producing thread safety
+// warning.  It disables the GUARDED_BY.
+#define GUARDED_BY_FIXME(x)
+
+// Disables warnings for a single read operation.  This can be used to avoid
+// warnings when it is known that the read is not actually involved in a race,
+// but the compiler cannot confirm that.
+#define TS_UNCHECKED_READ(x) thread_safety_analysis::ts_unchecked_read(x)
+
+
+namespace thread_safety_analysis {
+
+// Takes a reference to a guarded data member, and returns an unguarded
+// reference.
+template <typename T>
+inline const T& ts_unchecked_read(const T& v) NO_THREAD_SAFETY_ANALYSIS {
+  return v;
+}
+
+template <typename T>
+inline T& ts_unchecked_read(T& v) NO_THREAD_SAFETY_ANALYSIS {
+  return v;
+}
+
+}  // namespace thread_safety_analysis
+
+#endif  // ABSL_BASE_INTERNAL_THREAD_ANNOTATIONS_H_
diff --git a/absl/base/thread_annotations.h b/absl/base/thread_annotations.h
index 0b2c306..f98af9f 100644
--- a/absl/base/thread_annotations.h
+++ b/absl/base/thread_annotations.h
@@ -34,19 +34,22 @@
 #ifndef ABSL_BASE_THREAD_ANNOTATIONS_H_
 #define ABSL_BASE_THREAD_ANNOTATIONS_H_
 
+// TODO(mbonadei): Remove after the backward compatibility period.
+#include "absl/base/internal/thread_annotations.h"  // IWYU pragma: export
+
 #if defined(__clang__)
-#define THREAD_ANNOTATION_ATTRIBUTE__(x)   __attribute__((x))
+#define ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(x) __attribute__((x))
 #else
-#define THREAD_ANNOTATION_ATTRIBUTE__(x)   // no-op
+#define ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(x)  // no-op
 #endif
 
-// GUARDED_BY()
+// ABSL_GUARDED_BY()
 //
 // Documents if a shared field or global variable needs to be protected by a
-// mutex. GUARDED_BY() allows the user to specify a particular mutex that
+// mutex. ABSL_GUARDED_BY() allows the user to specify a particular mutex that
 // should be held when accessing the annotated variable.
 //
-// Although this annotation (and PT_GUARDED_BY, below) cannot be applied to
+// Although this annotation (and ABSL_PT_GUARDED_BY, below) cannot be applied to
 // local variables, a local variable and its associated mutex can often be
 // combined into a small class or struct, thereby allowing the annotation.
 //
@@ -54,12 +57,13 @@
 //
 //   class Foo {
 //     Mutex mu_;
-//     int p1_ GUARDED_BY(mu_);
+//     int p1_ ABSL_GUARDED_BY(mu_);
 //     ...
 //   };
-#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
+#define ABSL_GUARDED_BY(x) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(guarded_by(x))
 
-// PT_GUARDED_BY()
+// ABSL_PT_GUARDED_BY()
 //
 // Documents if the memory location pointed to by a pointer should be guarded
 // by a mutex when dereferencing the pointer.
@@ -67,7 +71,7 @@
 // Example:
 //   class Foo {
 //     Mutex mu_;
-//     int *p1_ PT_GUARDED_BY(mu_);
+//     int *p1_ ABSL_PT_GUARDED_BY(mu_);
 //     ...
 //   };
 //
@@ -78,31 +82,32 @@
 //
 //   // `q_`, guarded by `mu1_`, points to a shared memory location that is
 //   // guarded by `mu2_`:
-//   int *q_ GUARDED_BY(mu1_) PT_GUARDED_BY(mu2_);
-#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+//   int *q_ ABSL_GUARDED_BY(mu1_) ABSL_PT_GUARDED_BY(mu2_);
+#define ABSL_PT_GUARDED_BY(x) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(pt_guarded_by(x))
 
-// ACQUIRED_AFTER() / ACQUIRED_BEFORE()
+// ABSL_ACQUIRED_AFTER() / ABSL_ACQUIRED_BEFORE()
 //
 // Documents the acquisition order between locks that can be held
 // simultaneously by a thread. For any two locks that need to be annotated
 // to establish an acquisition order, only one of them needs the annotation.
-// (i.e. You don't have to annotate both locks with both ACQUIRED_AFTER
-// and ACQUIRED_BEFORE.)
+// (i.e. You don't have to annotate both locks with both ABSL_ACQUIRED_AFTER
+// and ABSL_ACQUIRED_BEFORE.)
 //
-// As with GUARDED_BY, this is only applicable to mutexes that are shared
+// As with ABSL_GUARDED_BY, this is only applicable to mutexes that are shared
 // fields or global variables.
 //
 // Example:
 //
 //   Mutex m1_;
-//   Mutex m2_ ACQUIRED_AFTER(m1_);
-#define ACQUIRED_AFTER(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
+//   Mutex m2_ ABSL_ACQUIRED_AFTER(m1_);
+#define ABSL_ACQUIRED_AFTER(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(acquired_after(__VA_ARGS__))
 
-#define ACQUIRED_BEFORE(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
+#define ABSL_ACQUIRED_BEFORE(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(acquired_before(__VA_ARGS__))
 
-// EXCLUSIVE_LOCKS_REQUIRED() / SHARED_LOCKS_REQUIRED()
+// ABSL_EXCLUSIVE_LOCKS_REQUIRED() / ABSL_SHARED_LOCKS_REQUIRED()
 //
 // Documents a function that expects a mutex to be held prior to entry.
 // The mutex is expected to be held both on entry to, and exit from, the
@@ -114,77 +119,78 @@
 // concurrently.
 //
 // Generally, non-const methods should be annotated with
-// EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with
-// SHARED_LOCKS_REQUIRED.
+// ABSL_EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with
+// ABSL_SHARED_LOCKS_REQUIRED.
 //
 // Example:
 //
 //   Mutex mu1, mu2;
-//   int a GUARDED_BY(mu1);
-//   int b GUARDED_BY(mu2);
+//   int a ABSL_GUARDED_BY(mu1);
+//   int b ABSL_GUARDED_BY(mu2);
 //
-//   void foo() EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... }
-//   void bar() const SHARED_LOCKS_REQUIRED(mu1, mu2) { ... }
-#define EXCLUSIVE_LOCKS_REQUIRED(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
+//   void foo() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... }
+//   void bar() const ABSL_SHARED_LOCKS_REQUIRED(mu1, mu2) { ... }
+#define ABSL_EXCLUSIVE_LOCKS_REQUIRED(...)   \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE( \
+      exclusive_locks_required(__VA_ARGS__))
 
-#define SHARED_LOCKS_REQUIRED(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
+#define ABSL_SHARED_LOCKS_REQUIRED(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(shared_locks_required(__VA_ARGS__))
 
-// LOCKS_EXCLUDED()
+// ABSL_LOCKS_EXCLUDED()
 //
 // Documents the locks acquired in the body of the function. These locks
 // cannot be held when calling this function (as Abseil's `Mutex` locks are
 // non-reentrant).
-#define LOCKS_EXCLUDED(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
+#define ABSL_LOCKS_EXCLUDED(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(locks_excluded(__VA_ARGS__))
 
-// LOCK_RETURNED()
+// ABSL_LOCK_RETURNED()
 //
 // Documents a function that returns a mutex without acquiring it.  For example,
 // a public getter method that returns a pointer to a private mutex should
-// be annotated with LOCK_RETURNED.
-#define LOCK_RETURNED(x) \
-  THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
+// be annotated with ABSL_LOCK_RETURNED.
+#define ABSL_LOCK_RETURNED(x) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(lock_returned(x))
 
-// LOCKABLE
+// ABSL_LOCKABLE
 //
 // Documents if a class/type is a lockable type (such as the `Mutex` class).
-#define LOCKABLE \
-  THREAD_ANNOTATION_ATTRIBUTE__(lockable)
+#define ABSL_LOCKABLE ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(lockable)
 
-// SCOPED_LOCKABLE
+// ABSL_SCOPED_LOCKABLE
 //
 // Documents if a class does RAII locking (such as the `MutexLock` class).
 // The constructor should use `LOCK_FUNCTION()` to specify the mutex that is
 // acquired, and the destructor should use `UNLOCK_FUNCTION()` with no
 // arguments; the analysis will assume that the destructor unlocks whatever the
 // constructor locked.
-#define SCOPED_LOCKABLE \
-  THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
+#define ABSL_SCOPED_LOCKABLE \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(scoped_lockable)
 
-// EXCLUSIVE_LOCK_FUNCTION()
+// ABSL_EXCLUSIVE_LOCK_FUNCTION()
 //
 // Documents functions that acquire a lock in the body of a function, and do
 // not release it.
-#define EXCLUSIVE_LOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
+#define ABSL_EXCLUSIVE_LOCK_FUNCTION(...)    \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE( \
+      exclusive_lock_function(__VA_ARGS__))
 
-// SHARED_LOCK_FUNCTION()
+// ABSL_SHARED_LOCK_FUNCTION()
 //
 // Documents functions that acquire a shared (reader) lock in the body of a
 // function, and do not release it.
-#define SHARED_LOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
+#define ABSL_SHARED_LOCK_FUNCTION(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(shared_lock_function(__VA_ARGS__))
 
-// UNLOCK_FUNCTION()
+// ABSL_UNLOCK_FUNCTION()
 //
 // Documents functions that expect a lock to be held on entry to the function,
 // and release it in the body of the function.
-#define UNLOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
+#define ABSL_UNLOCK_FUNCTION(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(unlock_function(__VA_ARGS__))
 
-// EXCLUSIVE_TRYLOCK_FUNCTION() / SHARED_TRYLOCK_FUNCTION()
+// ABSL_EXCLUSIVE_TRYLOCK_FUNCTION() / ABSL_SHARED_TRYLOCK_FUNCTION()
 //
 // Documents functions that try to acquire a lock, and return success or failure
 // (or a non-boolean value that can be interpreted as a boolean).
@@ -192,76 +198,80 @@
 // success, or `false` for functions that return `false` on success. The second
 // argument specifies the mutex that is locked on success. If unspecified, this
 // mutex is assumed to be `this`.
-#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
+#define ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE( \
+      exclusive_trylock_function(__VA_ARGS__))
 
-#define SHARED_TRYLOCK_FUNCTION(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
+#define ABSL_SHARED_TRYLOCK_FUNCTION(...)    \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE( \
+      shared_trylock_function(__VA_ARGS__))
 
-// ASSERT_EXCLUSIVE_LOCK() / ASSERT_SHARED_LOCK()
+// ABSL_ASSERT_EXCLUSIVE_LOCK() / ABSL_ASSERT_SHARED_LOCK()
 //
 // Documents functions that dynamically check to see if a lock is held, and fail
 // if it is not held.
-#define ASSERT_EXCLUSIVE_LOCK(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
+#define ABSL_ASSERT_EXCLUSIVE_LOCK(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(assert_exclusive_lock(__VA_ARGS__))
 
-#define ASSERT_SHARED_LOCK(...) \
-  THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_lock(__VA_ARGS__))
+#define ABSL_ASSERT_SHARED_LOCK(...) \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(assert_shared_lock(__VA_ARGS__))
 
-// NO_THREAD_SAFETY_ANALYSIS
+// ABSL_NO_THREAD_SAFETY_ANALYSIS
 //
 // Turns off thread safety checking within the body of a particular function.
 // This annotation is used to mark functions that are known to be correct, but
 // the locking behavior is more complicated than the analyzer can handle.
-#define NO_THREAD_SAFETY_ANALYSIS \
-  THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+#define ABSL_NO_THREAD_SAFETY_ANALYSIS \
+  ABSL_INTERNAL_THREAD_ANNOTATION_ATTRIBUTE(no_thread_safety_analysis)
 
 //------------------------------------------------------------------------------
 // Tool-Supplied Annotations
 //------------------------------------------------------------------------------
 
-// TS_UNCHECKED should be placed around lock expressions that are not valid
+// ABSL_TS_UNCHECKED should be placed around lock expressions that are not valid
 // C++ syntax, but which are present for documentation purposes.  These
 // annotations will be ignored by the analysis.
-#define TS_UNCHECKED(x) ""
+#define ABSL_TS_UNCHECKED(x) ""
 
-// TS_FIXME is used to mark lock expressions that are not valid C++ syntax.
+// ABSL_TS_FIXME is used to mark lock expressions that are not valid C++ syntax.
 // It is used by automated tools to mark and disable invalid expressions.
-// The annotation should either be fixed, or changed to TS_UNCHECKED.
-#define TS_FIXME(x) ""
+// The annotation should either be fixed, or changed to ABSL_TS_UNCHECKED.
+#define ABSL_TS_FIXME(x) ""
 
-// Like NO_THREAD_SAFETY_ANALYSIS, this turns off checking within the body of
-// a particular function.  However, this attribute is used to mark functions
+// Like ABSL_NO_THREAD_SAFETY_ANALYSIS, this turns off checking within the body
+// of a particular function.  However, this attribute is used to mark functions
 // that are incorrect and need to be fixed.  It is used by automated tools to
 // avoid breaking the build when the analysis is updated.
 // Code owners are expected to eventually fix the routine.
-#define NO_THREAD_SAFETY_ANALYSIS_FIXME  NO_THREAD_SAFETY_ANALYSIS
+#define ABSL_NO_THREAD_SAFETY_ANALYSIS_FIXME ABSL_NO_THREAD_SAFETY_ANALYSIS
 
-// Similar to NO_THREAD_SAFETY_ANALYSIS_FIXME, this macro marks a GUARDED_BY
-// annotation that needs to be fixed, because it is producing thread safety
-// warning.  It disables the GUARDED_BY.
-#define GUARDED_BY_FIXME(x)
+// Similar to ABSL_NO_THREAD_SAFETY_ANALYSIS_FIXME, this macro marks a
+// ABSL_GUARDED_BY annotation that needs to be fixed, because it is producing
+// thread safety warning. It disables the ABSL_GUARDED_BY.
+#define ABSL_GUARDED_BY_FIXME(x)
 
 // Disables warnings for a single read operation.  This can be used to avoid
 // warnings when it is known that the read is not actually involved in a race,
 // but the compiler cannot confirm that.
-#define TS_UNCHECKED_READ(x) thread_safety_analysis::ts_unchecked_read(x)
-
+#define ABSL_TS_UNCHECKED_READ(x) absl::base_internal::ts_unchecked_read(x)
 
-namespace thread_safety_analysis {
+namespace absl {
+namespace base_internal {
 
 // Takes a reference to a guarded data member, and returns an unguarded
 // reference.
+// Do not used this function directly, use ABSL_TS_UNCHECKED_READ instead.
 template <typename T>
-inline const T& ts_unchecked_read(const T& v) NO_THREAD_SAFETY_ANALYSIS {
+inline const T& ts_unchecked_read(const T& v) ABSL_NO_THREAD_SAFETY_ANALYSIS {
   return v;
 }
 
 template <typename T>
-inline T& ts_unchecked_read(T& v) NO_THREAD_SAFETY_ANALYSIS {
+inline T& ts_unchecked_read(T& v) ABSL_NO_THREAD_SAFETY_ANALYSIS {
   return v;
 }
 
-}  // namespace thread_safety_analysis
+}  // namespace base_internal
+}  // namespace absl
 
 #endif  // ABSL_BASE_THREAD_ANNOTATIONS_H_