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author | heretic <heretic@yandex-team.ru> | 2022-02-10 16:45:46 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:45:46 +0300 |
commit | 81eddc8c0b55990194e112b02d127b87d54164a9 (patch) | |
tree | 9142afc54d335ea52910662635b898e79e192e49 /contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h | |
parent | 397cbe258b9e064f49c4ca575279f02f39fef76e (diff) | |
download | ydb-81eddc8c0b55990194e112b02d127b87d54164a9.tar.gz |
Restoring authorship annotation for <heretic@yandex-team.ru>. Commit 2 of 2.
Diffstat (limited to 'contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h')
-rw-r--r-- | contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h | 176 |
1 files changed, 88 insertions, 88 deletions
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h b/contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h index f8661ad8b9..0762a852df 100644 --- a/contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h +++ b/contrib/restricted/abseil-cpp-tstring/y_absl/synchronization/mutex.h @@ -31,23 +31,23 @@ // // MutexLock - An RAII wrapper to acquire and release a `Mutex` for exclusive/ // write access within the current scope. -// +// // ReaderMutexLock // - An RAII wrapper to acquire and release a `Mutex` for shared/read // access within the current scope. // // WriterMutexLock -// - Effectively an alias for `MutexLock` above, designed for use in -// distinguishing reader and writer locks within code. +// - Effectively an alias for `MutexLock` above, designed for use in +// distinguishing reader and writer locks within code. // // In addition to simple mutex locks, this file also defines ways to perform // locking under certain conditions. // -// Condition - (Preferred) Used to wait for a particular predicate that -// depends on state protected by the `Mutex` to become true. -// CondVar - A lower-level variant of `Condition` that relies on -// application code to explicitly signal the `CondVar` when -// a condition has been met. +// Condition - (Preferred) Used to wait for a particular predicate that +// depends on state protected by the `Mutex` to become true. +// CondVar - A lower-level variant of `Condition` that relies on +// application code to explicitly signal the `CondVar` when +// a condition has been met. // // See below for more information on using `Condition` or `CondVar`. // @@ -147,7 +147,7 @@ class ABSL_LOCKABLE Mutex { // // Example usage: // namespace foo { - // ABSL_CONST_INIT y_absl::Mutex mu(y_absl::kConstInit); + // ABSL_CONST_INIT y_absl::Mutex mu(y_absl::kConstInit); // } explicit constexpr Mutex(y_absl::ConstInitType); @@ -162,7 +162,7 @@ class ABSL_LOCKABLE Mutex { // Mutex::Unlock() // // Releases this `Mutex` and returns it from the exclusive/write state to the - // free state. Calling thread must hold the `Mutex` exclusively. + // free state. Calling thread must hold the `Mutex` exclusively. void Unlock() ABSL_UNLOCK_FUNCTION(); // Mutex::TryLock() @@ -323,16 +323,16 @@ class ABSL_LOCKABLE Mutex { // Mutex::AwaitWithTimeout() // Mutex::AwaitWithDeadline() // - // Unlocks this `Mutex` and blocks until simultaneously: + // Unlocks this `Mutex` and blocks until simultaneously: // - either `cond` is true or the {timeout has expired, deadline has passed} // and // - this `Mutex` can be reacquired, // then reacquire this `Mutex` in the same mode in which it was previously // held, returning `true` iff `cond` is `true` on return. // - // If the condition is initially `true`, the implementation *may* skip the - // release/re-acquire step and return immediately. - // + // If the condition is initially `true`, the implementation *may* skip the + // release/re-acquire step and return immediately. + // // Deadlines in the past are equivalent to an immediate deadline. // Negative timeouts are equivalent to a zero timeout. // @@ -457,9 +457,9 @@ class ABSL_LOCKABLE Mutex { // Post()/Wait() versus associated PerThreadSem; in class for required // friendship with PerThreadSem. - static void IncrementSynchSem(Mutex *mu, base_internal::PerThreadSynch *w); - static bool DecrementSynchSem(Mutex *mu, base_internal::PerThreadSynch *w, - synchronization_internal::KernelTimeout t); + static void IncrementSynchSem(Mutex *mu, base_internal::PerThreadSynch *w); + static bool DecrementSynchSem(Mutex *mu, base_internal::PerThreadSynch *w, + synchronization_internal::KernelTimeout t); // slow path acquire void LockSlowLoop(SynchWaitParams *waitp, int flags); @@ -505,36 +505,36 @@ class ABSL_LOCKABLE Mutex { // Example: // // Class Foo { -// public: +// public: // Foo::Bar* Baz() { -// MutexLock lock(&mu_); +// MutexLock lock(&mu_); // ... // return bar; // } // // private: -// Mutex mu_; +// Mutex mu_; // }; class ABSL_SCOPED_LOCKABLE MutexLock { public: - // Constructors - - // Calls `mu->Lock()` and returns when that call returns. That is, `*mu` is - // guaranteed to be locked when this object is constructed. Requires that - // `mu` be dereferenceable. + // Constructors + + // Calls `mu->Lock()` and returns when that call returns. That is, `*mu` is + // guaranteed to be locked when this object is constructed. Requires that + // `mu` be dereferenceable. explicit MutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) { this->mu_->Lock(); } - // Like above, but calls `mu->LockWhen(cond)` instead. That is, in addition to - // the above, the condition given by `cond` is also guaranteed to hold when - // this object is constructed. - explicit MutexLock(Mutex *mu, const Condition &cond) - ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) - : mu_(mu) { - this->mu_->LockWhen(cond); - } - + // Like above, but calls `mu->LockWhen(cond)` instead. That is, in addition to + // the above, the condition given by `cond` is also guaranteed to hold when + // this object is constructed. + explicit MutexLock(Mutex *mu, const Condition &cond) + ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) + : mu_(mu) { + this->mu_->LockWhen(cond); + } + MutexLock(const MutexLock &) = delete; // NOLINT(runtime/mutex) MutexLock(MutexLock&&) = delete; // NOLINT(runtime/mutex) MutexLock& operator=(const MutexLock&) = delete; @@ -556,12 +556,12 @@ class ABSL_SCOPED_LOCKABLE ReaderMutexLock { mu->ReaderLock(); } - explicit ReaderMutexLock(Mutex *mu, const Condition &cond) - ABSL_SHARED_LOCK_FUNCTION(mu) - : mu_(mu) { - mu->ReaderLockWhen(cond); - } - + explicit ReaderMutexLock(Mutex *mu, const Condition &cond) + ABSL_SHARED_LOCK_FUNCTION(mu) + : mu_(mu) { + mu->ReaderLockWhen(cond); + } + ReaderMutexLock(const ReaderMutexLock&) = delete; ReaderMutexLock(ReaderMutexLock&&) = delete; ReaderMutexLock& operator=(const ReaderMutexLock&) = delete; @@ -584,12 +584,12 @@ class ABSL_SCOPED_LOCKABLE WriterMutexLock { mu->WriterLock(); } - explicit WriterMutexLock(Mutex *mu, const Condition &cond) - ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) - : mu_(mu) { - mu->WriterLockWhen(cond); - } - + explicit WriterMutexLock(Mutex *mu, const Condition &cond) + ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) + : mu_(mu) { + mu->WriterLockWhen(cond); + } + WriterMutexLock(const WriterMutexLock&) = delete; WriterMutexLock(WriterMutexLock&&) = delete; WriterMutexLock& operator=(const WriterMutexLock&) = delete; @@ -628,27 +628,27 @@ class ABSL_SCOPED_LOCKABLE WriterMutexLock { // `noexcept`; until then this requirement cannot be enforced in the // type system.) // -// Note: to use a `Condition`, you need only construct it and pass it to a -// suitable `Mutex' member function, such as `Mutex::Await()`, or to the -// constructor of one of the scope guard classes. +// Note: to use a `Condition`, you need only construct it and pass it to a +// suitable `Mutex' member function, such as `Mutex::Await()`, or to the +// constructor of one of the scope guard classes. // -// Example using LockWhen/Unlock: +// Example using LockWhen/Unlock: // // // assume count_ is not internal reference count // int count_ ABSL_GUARDED_BY(mu_); -// Condition count_is_zero(+[](int *count) { return *count == 0; }, &count_); -// -// mu_.LockWhen(count_is_zero); -// // ... -// mu_.Unlock(); -// -// Example using a scope guard: -// -// { -// MutexLock lock(&mu_, count_is_zero); -// // ... -// } -// +// Condition count_is_zero(+[](int *count) { return *count == 0; }, &count_); +// +// mu_.LockWhen(count_is_zero); +// // ... +// mu_.Unlock(); +// +// Example using a scope guard: +// +// { +// MutexLock lock(&mu_, count_is_zero); +// // ... +// } +// // When multiple threads are waiting on exactly the same condition, make sure // that they are constructed with the same parameters (same pointer to function // + arg, or same pointer to object + method), so that the mutex implementation @@ -701,11 +701,11 @@ class Condition { // return processed_ >= current; // }; // mu_.Await(Condition(&reached)); - // - // NOTE: never use "mu_.AssertHeld()" instead of "mu_.AssertReaderHeld()" in - // the lambda as it may be called when the mutex is being unlocked from a - // scope holding only a reader lock, which will make the assertion not - // fulfilled and crash the binary. + // + // NOTE: never use "mu_.AssertHeld()" instead of "mu_.AssertReaderHeld()" in + // the lambda as it may be called when the mutex is being unlocked from a + // scope holding only a reader lock, which will make the assertion not + // fulfilled and crash the binary. // See class comment for performance advice. In particular, if there // might be more than one waiter for the same condition, make sure @@ -790,8 +790,8 @@ class Condition { // class CondVar { public: - // A `CondVar` allocated on the heap or on the stack can use the this - // constructor. + // A `CondVar` allocated on the heap or on the stack can use the this + // constructor. CondVar(); ~CondVar(); @@ -879,15 +879,15 @@ class ABSL_SCOPED_LOCKABLE MutexLockMaybe { this->mu_->Lock(); } } - - explicit MutexLockMaybe(Mutex *mu, const Condition &cond) - ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) - : mu_(mu) { - if (this->mu_ != nullptr) { - this->mu_->LockWhen(cond); - } - } - + + explicit MutexLockMaybe(Mutex *mu, const Condition &cond) + ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) + : mu_(mu) { + if (this->mu_ != nullptr) { + this->mu_->LockWhen(cond); + } + } + ~MutexLockMaybe() ABSL_UNLOCK_FUNCTION() { if (this->mu_ != nullptr) { this->mu_->Unlock(); } } @@ -910,13 +910,13 @@ class ABSL_SCOPED_LOCKABLE ReleasableMutexLock { : mu_(mu) { this->mu_->Lock(); } - - explicit ReleasableMutexLock(Mutex *mu, const Condition &cond) - ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) - : mu_(mu) { - this->mu_->LockWhen(cond); - } - + + explicit ReleasableMutexLock(Mutex *mu, const Condition &cond) + ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) + : mu_(mu) { + this->mu_->LockWhen(cond); + } + ~ReleasableMutexLock() ABSL_UNLOCK_FUNCTION() { if (this->mu_ != nullptr) { this->mu_->Unlock(); } } @@ -1005,7 +1005,7 @@ void RegisterMutexProfiler(void (*fn)(int64_t wait_timestamp)); // // This has the same memory ordering concerns as RegisterMutexProfiler() above. void RegisterMutexTracer(void (*fn)(const char *msg, const void *obj, - int64_t wait_cycles)); + int64_t wait_cycles)); // TODO(gfalcon): Combine RegisterMutexProfiler() and RegisterMutexTracer() // into a single interface, since they are only ever called in pairs. @@ -1076,7 +1076,7 @@ ABSL_NAMESPACE_END // By changing our extension points to be extern "C", we dodge this // check. extern "C" { -void ABSL_INTERNAL_C_SYMBOL(AbslInternalMutexYield)(); +void ABSL_INTERNAL_C_SYMBOL(AbslInternalMutexYield)(); } // extern "C" #endif // ABSL_SYNCHRONIZATION_MUTEX_H_ |