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Diffstat (limited to 'third_party/abseil_cpp/absl/base/thread_annotations.h')
| -rw-r--r-- | third_party/abseil_cpp/absl/base/thread_annotations.h | 335 |
1 files changed, 0 insertions, 335 deletions
diff --git a/third_party/abseil_cpp/absl/base/thread_annotations.h b/third_party/abseil_cpp/absl/base/thread_annotations.h deleted file mode 100644 index e23fff1d2013..000000000000 --- a/third_party/abseil_cpp/absl/base/thread_annotations.h +++ /dev/null @@ -1,335 +0,0 @@ -// Copyright 2017 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 -// ----------------------------------------------------------------------------- -// -// 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_THREAD_ANNOTATIONS_H_ -#define ABSL_BASE_THREAD_ANNOTATIONS_H_ - -#include "absl/base/attributes.h" -#include "absl/base/config.h" -// TODO(mbonadei): Remove after the backward compatibility period. -#include "absl/base/internal/thread_annotations.h" // IWYU pragma: export - -// ABSL_GUARDED_BY() -// -// Documents if a shared field or global variable needs to be protected by a -// 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 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. -// -// Example: -// -// class Foo { -// Mutex mu_; -// int p1_ ABSL_GUARDED_BY(mu_); -// ... -// }; -#if ABSL_HAVE_ATTRIBUTE(guarded_by) -#define ABSL_GUARDED_BY(x) __attribute__((guarded_by(x))) -#else -#define ABSL_GUARDED_BY(x) -#endif - -// ABSL_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_ ABSL_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_ ABSL_GUARDED_BY(mu1_) ABSL_PT_GUARDED_BY(mu2_); -#if ABSL_HAVE_ATTRIBUTE(pt_guarded_by) -#define ABSL_PT_GUARDED_BY(x) __attribute__((pt_guarded_by(x))) -#else -#define ABSL_PT_GUARDED_BY(x) -#endif - -// 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 ABSL_ACQUIRED_AFTER -// and ABSL_ACQUIRED_BEFORE.) -// -// As with ABSL_GUARDED_BY, this is only applicable to mutexes that are shared -// fields or global variables. -// -// Example: -// -// Mutex m1_; -// Mutex m2_ ABSL_ACQUIRED_AFTER(m1_); -#if ABSL_HAVE_ATTRIBUTE(acquired_after) -#define ABSL_ACQUIRED_AFTER(...) __attribute__((acquired_after(__VA_ARGS__))) -#else -#define ABSL_ACQUIRED_AFTER(...) -#endif - -#if ABSL_HAVE_ATTRIBUTE(acquired_before) -#define ABSL_ACQUIRED_BEFORE(...) __attribute__((acquired_before(__VA_ARGS__))) -#else -#define ABSL_ACQUIRED_BEFORE(...) -#endif - -// 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 -// 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 -// ABSL_EXCLUSIVE_LOCKS_REQUIRED, while const methods should be annotated with -// ABSL_SHARED_LOCKS_REQUIRED. -// -// Example: -// -// Mutex mu1, mu2; -// int a ABSL_GUARDED_BY(mu1); -// int b ABSL_GUARDED_BY(mu2); -// -// void foo() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mu1, mu2) { ... } -// void bar() const ABSL_SHARED_LOCKS_REQUIRED(mu1, mu2) { ... } -#if ABSL_HAVE_ATTRIBUTE(exclusive_locks_required) -#define ABSL_EXCLUSIVE_LOCKS_REQUIRED(...) \ - __attribute__((exclusive_locks_required(__VA_ARGS__))) -#else -#define ABSL_EXCLUSIVE_LOCKS_REQUIRED(...) -#endif - -#if ABSL_HAVE_ATTRIBUTE(shared_locks_required) -#define ABSL_SHARED_LOCKS_REQUIRED(...) \ - __attribute__((shared_locks_required(__VA_ARGS__))) -#else -#define ABSL_SHARED_LOCKS_REQUIRED(...) -#endif - -// 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). -#if ABSL_HAVE_ATTRIBUTE(locks_excluded) -#define ABSL_LOCKS_EXCLUDED(...) __attribute__((locks_excluded(__VA_ARGS__))) -#else -#define ABSL_LOCKS_EXCLUDED(...) -#endif - -// 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 ABSL_LOCK_RETURNED. -#if ABSL_HAVE_ATTRIBUTE(lock_returned) -#define ABSL_LOCK_RETURNED(x) __attribute__((lock_returned(x))) -#else -#define ABSL_LOCK_RETURNED(x) -#endif - -// ABSL_LOCKABLE -// -// Documents if a class/type is a lockable type (such as the `Mutex` class). -#if ABSL_HAVE_ATTRIBUTE(lockable) -#define ABSL_LOCKABLE __attribute__((lockable)) -#else -#define ABSL_LOCKABLE -#endif - -// 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. -#if ABSL_HAVE_ATTRIBUTE(scoped_lockable) -#define ABSL_SCOPED_LOCKABLE __attribute__((scoped_lockable)) -#else -#define ABSL_SCOPED_LOCKABLE -#endif - -// ABSL_EXCLUSIVE_LOCK_FUNCTION() -// -// Documents functions that acquire a lock in the body of a function, and do -// not release it. -#if ABSL_HAVE_ATTRIBUTE(exclusive_lock_function) -#define ABSL_EXCLUSIVE_LOCK_FUNCTION(...) \ - __attribute__((exclusive_lock_function(__VA_ARGS__))) -#else -#define ABSL_EXCLUSIVE_LOCK_FUNCTION(...) -#endif - -// ABSL_SHARED_LOCK_FUNCTION() -// -// Documents functions that acquire a shared (reader) lock in the body of a -// function, and do not release it. -#if ABSL_HAVE_ATTRIBUTE(shared_lock_function) -#define ABSL_SHARED_LOCK_FUNCTION(...) \ - __attribute__((shared_lock_function(__VA_ARGS__))) -#else -#define ABSL_SHARED_LOCK_FUNCTION(...) -#endif - -// 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. -#if ABSL_HAVE_ATTRIBUTE(unlock_function) -#define ABSL_UNLOCK_FUNCTION(...) __attribute__((unlock_function(__VA_ARGS__))) -#else -#define ABSL_UNLOCK_FUNCTION(...) -#endif - -// 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). -// 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`. -#if ABSL_HAVE_ATTRIBUTE(exclusive_trylock_function) -#define ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(...) \ - __attribute__((exclusive_trylock_function(__VA_ARGS__))) -#else -#define ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(...) -#endif - -#if ABSL_HAVE_ATTRIBUTE(shared_trylock_function) -#define ABSL_SHARED_TRYLOCK_FUNCTION(...) \ - __attribute__((shared_trylock_function(__VA_ARGS__))) -#else -#define ABSL_SHARED_TRYLOCK_FUNCTION(...) -#endif - -// 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. -#if ABSL_HAVE_ATTRIBUTE(assert_exclusive_lock) -#define ABSL_ASSERT_EXCLUSIVE_LOCK(...) \ - __attribute__((assert_exclusive_lock(__VA_ARGS__))) -#else -#define ABSL_ASSERT_EXCLUSIVE_LOCK(...) -#endif - -#if ABSL_HAVE_ATTRIBUTE(assert_shared_lock) -#define ABSL_ASSERT_SHARED_LOCK(...) \ - __attribute__((assert_shared_lock(__VA_ARGS__))) -#else -#define ABSL_ASSERT_SHARED_LOCK(...) -#endif - -// 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. -#if ABSL_HAVE_ATTRIBUTE(no_thread_safety_analysis) -#define ABSL_NO_THREAD_SAFETY_ANALYSIS \ - __attribute__((no_thread_safety_analysis)) -#else -#define ABSL_NO_THREAD_SAFETY_ANALYSIS -#endif - -//------------------------------------------------------------------------------ -// Tool-Supplied Annotations -//------------------------------------------------------------------------------ - -// 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 ABSL_TS_UNCHECKED(x) "" - -// 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 ABSL_TS_UNCHECKED. -#define ABSL_TS_FIXME(x) "" - -// 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 ABSL_NO_THREAD_SAFETY_ANALYSIS_FIXME ABSL_NO_THREAD_SAFETY_ANALYSIS - -// 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 ABSL_TS_UNCHECKED_READ(x) absl::base_internal::ts_unchecked_read(x) - -namespace absl { -ABSL_NAMESPACE_BEGIN -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) ABSL_NO_THREAD_SAFETY_ANALYSIS { - return v; -} - -template <typename T> -inline T& ts_unchecked_read(T& v) ABSL_NO_THREAD_SAFETY_ANALYSIS { - return v; -} - -} // namespace base_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_BASE_THREAD_ANNOTATIONS_H_ |