diff options
Diffstat (limited to 'absl/base')
| -rw-r--r-- | absl/base/BUILD.bazel | 4 | ||||
| -rw-r--r-- | absl/base/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | absl/base/internal/thread_annotations.h | 271 | ||||
| -rw-r--r-- | absl/base/thread_annotations.h | 178 |
4 files changed, 369 insertions, 85 deletions
diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel index c6f0e4d63860..5b7b295a6f9b 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 b9f35bc0bb30..34bfba27d55d 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 000000000000..4dab6a9c150a --- /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 0b2c306ccc57..f98af9f93d0a 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_ |