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author | Abseil Team <absl-team@google.com> | 2020-02-25 22:27:31 +0100 |
---|---|---|
committer | CJ Johnson <johnsoncj@google.com> | 2020-02-25 17:56:58 -0500 |
commit | b832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch) | |
tree | 3ad4be9a9a4105366be714da9458e076a77be18f /absl/synchronization/mutex.h | |
parent | aa844899c937bde5d2b24f276b59997e5b668bde (diff) |
Creation of LTS branch "lts_2020_02_25"20200225
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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7
Diffstat (limited to 'absl/synchronization/mutex.h')
-rw-r--r-- | absl/synchronization/mutex.h | 94 |
1 files changed, 47 insertions, 47 deletions
diff --git a/absl/synchronization/mutex.h b/absl/synchronization/mutex.h index d6890099..8c70c4ce 100644 --- a/absl/synchronization/mutex.h +++ b/absl/synchronization/mutex.h @@ -82,7 +82,7 @@ #endif namespace absl { -inline namespace lts_2019_08_08 { +ABSL_NAMESPACE_BEGIN class Condition; struct SynchWaitParams; @@ -136,7 +136,7 @@ struct SynchWaitParams; // // See also `MutexLock`, below, for scoped `Mutex` acquisition. -class LOCKABLE Mutex { +class ABSL_LOCKABLE Mutex { public: // Creates a `Mutex` that is not held by anyone. This constructor is // typically used for Mutexes allocated on the heap or the stack. @@ -165,27 +165,27 @@ class LOCKABLE Mutex { // // Blocks the calling thread, if necessary, until this `Mutex` is free, and // then acquires it exclusively. (This lock is also known as a "write lock.") - void Lock() EXCLUSIVE_LOCK_FUNCTION(); + void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION(); // Mutex::Unlock() // // Releases this `Mutex` and returns it from the exclusive/write state to the // free state. Caller must hold the `Mutex` exclusively. - void Unlock() UNLOCK_FUNCTION(); + void Unlock() ABSL_UNLOCK_FUNCTION(); // Mutex::TryLock() // // If the mutex can be acquired without blocking, does so exclusively and // returns `true`. Otherwise, returns `false`. Returns `true` with high // probability if the `Mutex` was free. - bool TryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true); + bool TryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true); // Mutex::AssertHeld() // // Return immediately if this thread holds the `Mutex` exclusively (in write // mode). Otherwise, may report an error (typically by crashing with a // diagnostic), or may return immediately. - void AssertHeld() const ASSERT_EXCLUSIVE_LOCK(); + void AssertHeld() const ABSL_ASSERT_EXCLUSIVE_LOCK(); // --------------------------------------------------------------------------- // Reader-Writer Locking @@ -226,28 +226,28 @@ class LOCKABLE Mutex { // `ReaderLock()` will block if some other thread has an exclusive/writer lock // on the mutex. - void ReaderLock() SHARED_LOCK_FUNCTION(); + void ReaderLock() ABSL_SHARED_LOCK_FUNCTION(); // Mutex::ReaderUnlock() // // Releases a read share of this `Mutex`. `ReaderUnlock` may return a mutex to // the free state if this thread holds the last reader lock on the mutex. Note // that you cannot call `ReaderUnlock()` on a mutex held in write mode. - void ReaderUnlock() UNLOCK_FUNCTION(); + void ReaderUnlock() ABSL_UNLOCK_FUNCTION(); // Mutex::ReaderTryLock() // // If the mutex can be acquired without blocking, acquires this mutex for // shared access and returns `true`. Otherwise, returns `false`. Returns // `true` with high probability if the `Mutex` was free or shared. - bool ReaderTryLock() SHARED_TRYLOCK_FUNCTION(true); + bool ReaderTryLock() ABSL_SHARED_TRYLOCK_FUNCTION(true); // Mutex::AssertReaderHeld() // // Returns immediately if this thread holds the `Mutex` in at least shared // mode (read mode). Otherwise, may report an error (typically by // crashing with a diagnostic), or may return immediately. - void AssertReaderHeld() const ASSERT_SHARED_LOCK(); + void AssertReaderHeld() const ABSL_ASSERT_SHARED_LOCK(); // Mutex::WriterLock() // Mutex::WriterUnlock() @@ -258,11 +258,11 @@ class LOCKABLE Mutex { // These methods may be used (along with the complementary `Reader*()` // methods) to distingish simple exclusive `Mutex` usage (`Lock()`, // etc.) from reader/writer lock usage. - void WriterLock() EXCLUSIVE_LOCK_FUNCTION() { this->Lock(); } + void WriterLock() ABSL_EXCLUSIVE_LOCK_FUNCTION() { this->Lock(); } - void WriterUnlock() UNLOCK_FUNCTION() { this->Unlock(); } + void WriterUnlock() ABSL_UNLOCK_FUNCTION() { this->Unlock(); } - bool WriterTryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true) { + bool WriterTryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true) { return this->TryLock(); } @@ -316,11 +316,11 @@ class LOCKABLE Mutex { // be acquired, then atomically acquires this `Mutex`. `LockWhen()` is // logically equivalent to `*Lock(); Await();` though they may have different // performance characteristics. - void LockWhen(const Condition &cond) EXCLUSIVE_LOCK_FUNCTION(); + void LockWhen(const Condition &cond) ABSL_EXCLUSIVE_LOCK_FUNCTION(); - void ReaderLockWhen(const Condition &cond) SHARED_LOCK_FUNCTION(); + void ReaderLockWhen(const Condition &cond) ABSL_SHARED_LOCK_FUNCTION(); - void WriterLockWhen(const Condition &cond) EXCLUSIVE_LOCK_FUNCTION() { + void WriterLockWhen(const Condition &cond) ABSL_EXCLUSIVE_LOCK_FUNCTION() { this->LockWhen(cond); } @@ -362,11 +362,11 @@ class LOCKABLE Mutex { // // Negative timeouts are equivalent to a zero timeout. bool LockWhenWithTimeout(const Condition &cond, absl::Duration timeout) - EXCLUSIVE_LOCK_FUNCTION(); + ABSL_EXCLUSIVE_LOCK_FUNCTION(); bool ReaderLockWhenWithTimeout(const Condition &cond, absl::Duration timeout) - SHARED_LOCK_FUNCTION(); + ABSL_SHARED_LOCK_FUNCTION(); bool WriterLockWhenWithTimeout(const Condition &cond, absl::Duration timeout) - EXCLUSIVE_LOCK_FUNCTION() { + ABSL_EXCLUSIVE_LOCK_FUNCTION() { return this->LockWhenWithTimeout(cond, timeout); } @@ -382,11 +382,11 @@ class LOCKABLE Mutex { // // Deadlines in the past are equivalent to an immediate deadline. bool LockWhenWithDeadline(const Condition &cond, absl::Time deadline) - EXCLUSIVE_LOCK_FUNCTION(); + ABSL_EXCLUSIVE_LOCK_FUNCTION(); bool ReaderLockWhenWithDeadline(const Condition &cond, absl::Time deadline) - SHARED_LOCK_FUNCTION(); + ABSL_SHARED_LOCK_FUNCTION(); bool WriterLockWhenWithDeadline(const Condition &cond, absl::Time deadline) - EXCLUSIVE_LOCK_FUNCTION() { + ABSL_EXCLUSIVE_LOCK_FUNCTION() { return this->LockWhenWithDeadline(cond, deadline); } @@ -536,9 +536,9 @@ class LOCKABLE Mutex { // private: // Mutex lock_; // }; -class SCOPED_LOCKABLE MutexLock { +class ABSL_SCOPED_LOCKABLE MutexLock { public: - explicit MutexLock(Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) { + explicit MutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) { this->mu_->Lock(); } @@ -547,7 +547,7 @@ class SCOPED_LOCKABLE MutexLock { MutexLock& operator=(const MutexLock&) = delete; MutexLock& operator=(MutexLock&&) = delete; - ~MutexLock() UNLOCK_FUNCTION() { this->mu_->Unlock(); } + ~MutexLock() ABSL_UNLOCK_FUNCTION() { this->mu_->Unlock(); } private: Mutex *const mu_; @@ -557,10 +557,9 @@ class SCOPED_LOCKABLE MutexLock { // // The `ReaderMutexLock` is a helper class, like `MutexLock`, which acquires and // releases a shared lock on a `Mutex` via RAII. -class SCOPED_LOCKABLE ReaderMutexLock { +class ABSL_SCOPED_LOCKABLE ReaderMutexLock { public: - explicit ReaderMutexLock(Mutex *mu) SHARED_LOCK_FUNCTION(mu) - : mu_(mu) { + explicit ReaderMutexLock(Mutex *mu) ABSL_SHARED_LOCK_FUNCTION(mu) : mu_(mu) { mu->ReaderLock(); } @@ -569,9 +568,7 @@ class SCOPED_LOCKABLE ReaderMutexLock { ReaderMutexLock& operator=(const ReaderMutexLock&) = delete; ReaderMutexLock& operator=(ReaderMutexLock&&) = delete; - ~ReaderMutexLock() UNLOCK_FUNCTION() { - this->mu_->ReaderUnlock(); - } + ~ReaderMutexLock() ABSL_UNLOCK_FUNCTION() { this->mu_->ReaderUnlock(); } private: Mutex *const mu_; @@ -581,9 +578,9 @@ class SCOPED_LOCKABLE ReaderMutexLock { // // The `WriterMutexLock` is a helper class, like `MutexLock`, which acquires and // releases a write (exclusive) lock on a `Mutex` via RAII. -class SCOPED_LOCKABLE WriterMutexLock { +class ABSL_SCOPED_LOCKABLE WriterMutexLock { public: - explicit WriterMutexLock(Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu) + explicit WriterMutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) { mu->WriterLock(); } @@ -593,9 +590,7 @@ class SCOPED_LOCKABLE WriterMutexLock { WriterMutexLock& operator=(const WriterMutexLock&) = delete; WriterMutexLock& operator=(WriterMutexLock&&) = delete; - ~WriterMutexLock() UNLOCK_FUNCTION() { - this->mu_->WriterUnlock(); - } + ~WriterMutexLock() ABSL_UNLOCK_FUNCTION() { this->mu_->WriterUnlock(); } private: Mutex *const mu_; @@ -634,7 +629,7 @@ class SCOPED_LOCKABLE WriterMutexLock { // Example: // // // assume count_ is not internal reference count -// int count_ GUARDED_BY(mu_); +// int count_ ABSL_GUARDED_BY(mu_); // // mu_.LockWhen(Condition(+[](int* count) { return *count == 0; }, // &count_)); @@ -861,13 +856,18 @@ class CondVar { // MutexLockMaybe // // MutexLockMaybe is like MutexLock, but is a no-op when mu is null. -class SCOPED_LOCKABLE MutexLockMaybe { +class ABSL_SCOPED_LOCKABLE MutexLockMaybe { public: - explicit MutexLockMaybe(Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu) - : mu_(mu) { if (this->mu_ != nullptr) { this->mu_->Lock(); } } - ~MutexLockMaybe() UNLOCK_FUNCTION() { + explicit MutexLockMaybe(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) + : mu_(mu) { + if (this->mu_ != nullptr) { + this->mu_->Lock(); + } + } + ~MutexLockMaybe() ABSL_UNLOCK_FUNCTION() { if (this->mu_ != nullptr) { this->mu_->Unlock(); } } + private: Mutex *const mu_; MutexLockMaybe(const MutexLockMaybe&) = delete; @@ -880,17 +880,17 @@ class SCOPED_LOCKABLE MutexLockMaybe { // // ReleasableMutexLock is like MutexLock, but permits `Release()` of its // mutex before destruction. `Release()` may be called at most once. -class SCOPED_LOCKABLE ReleasableMutexLock { +class ABSL_SCOPED_LOCKABLE ReleasableMutexLock { public: - explicit ReleasableMutexLock(Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu) + explicit ReleasableMutexLock(Mutex *mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) { this->mu_->Lock(); } - ~ReleasableMutexLock() UNLOCK_FUNCTION() { + ~ReleasableMutexLock() ABSL_UNLOCK_FUNCTION() { if (this->mu_ != nullptr) { this->mu_->Unlock(); } } - void Release() UNLOCK_FUNCTION(); + void Release() ABSL_UNLOCK_FUNCTION(); private: Mutex *mu_; @@ -1001,7 +1001,7 @@ void RegisterCondVarTracer(void (*fn)(const char *msg, const void *cv)); // // 'pc' is the program counter being symbolized, 'out' is the buffer to write // into, and 'out_size' is the size of the buffer. This function can return -// false if symbolizing failed, or true if a null-terminated symbol was written +// false if symbolizing failed, or true if a NUL-terminated symbol was written // to 'out.' // // This has the same memory ordering concerns as RegisterMutexProfiler() above. @@ -1040,7 +1040,7 @@ enum class OnDeadlockCycle { // the manner chosen here. void SetMutexDeadlockDetectionMode(OnDeadlockCycle mode); -} // inline namespace lts_2019_08_08 +ABSL_NAMESPACE_END } // namespace absl // In some build configurations we pass --detect-odr-violations to the |