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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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151 lines
3.6 KiB
151 lines
3.6 KiB
// |
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// |
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// Copyright 2019 gRPC authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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// |
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#ifndef GRPCPP_IMPL_SYNC_H |
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#define GRPCPP_IMPL_SYNC_H |
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#include <grpc/support/port_platform.h> |
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#ifdef GPR_HAS_PTHREAD_H |
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#include <pthread.h> |
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#endif |
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#include <mutex> |
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#include "absl/log/check.h" |
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#include "absl/synchronization/mutex.h" |
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#include <grpc/support/log.h> |
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#include <grpc/support/sync.h> |
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#include <grpc/support/time.h> |
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// The core library is not accessible in C++ codegen headers, and vice versa. |
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// Thus, we need to have duplicate headers with similar functionality. |
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// Make sure any change to this file is also reflected in |
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// src/core/lib/gprpp/sync.h too. |
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// |
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// Whenever possible, prefer "src/core/lib/gprpp/sync.h" over this file, |
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// since in core we do not rely on g_core_codegen_interface and hence do not |
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// pay the costs of virtual function calls. |
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namespace grpc { |
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namespace internal { |
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#ifdef GPR_ABSEIL_SYNC |
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using Mutex = absl::Mutex; |
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using MutexLock = absl::MutexLock; |
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using ReleasableMutexLock = absl::ReleasableMutexLock; |
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using CondVar = absl::CondVar; |
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#else |
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class ABSL_LOCKABLE Mutex { |
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public: |
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Mutex() { gpr_mu_init(&mu_); } |
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~Mutex() { gpr_mu_destroy(&mu_); } |
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Mutex(const Mutex&) = delete; |
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Mutex& operator=(const Mutex&) = delete; |
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void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() { gpr_mu_lock(&mu_); } |
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void Unlock() ABSL_UNLOCK_FUNCTION() { gpr_mu_unlock(&mu_); } |
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private: |
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union { |
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gpr_mu mu_; |
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std::mutex do_not_use_sth_; |
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#ifdef GPR_HAS_PTHREAD_H |
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pthread_mutex_t do_not_use_pth_; |
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#endif |
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}; |
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friend class CondVar; |
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}; |
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class ABSL_SCOPED_LOCKABLE MutexLock { |
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public: |
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explicit MutexLock(Mutex* mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) { |
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mu_->Lock(); |
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} |
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~MutexLock() ABSL_UNLOCK_FUNCTION() { mu_->Unlock(); } |
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MutexLock(const MutexLock&) = delete; |
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MutexLock& operator=(const MutexLock&) = delete; |
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private: |
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Mutex* const mu_; |
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}; |
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class ABSL_SCOPED_LOCKABLE ReleasableMutexLock { |
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public: |
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explicit ReleasableMutexLock(Mutex* mu) ABSL_EXCLUSIVE_LOCK_FUNCTION(mu) |
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: mu_(mu) { |
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mu_->Lock(); |
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} |
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~ReleasableMutexLock() ABSL_UNLOCK_FUNCTION() { |
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if (!released_) mu_->Unlock(); |
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} |
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ReleasableMutexLock(const ReleasableMutexLock&) = delete; |
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ReleasableMutexLock& operator=(const ReleasableMutexLock&) = delete; |
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void Release() ABSL_UNLOCK_FUNCTION() { |
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DCHECK(!released_); |
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released_ = true; |
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mu_->Unlock(); |
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} |
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private: |
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Mutex* const mu_; |
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bool released_ = false; |
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}; |
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class CondVar { |
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public: |
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CondVar() { gpr_cv_init(&cv_); } |
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~CondVar() { gpr_cv_destroy(&cv_); } |
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CondVar(const CondVar&) = delete; |
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CondVar& operator=(const CondVar&) = delete; |
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void Signal() { gpr_cv_signal(&cv_); } |
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void SignalAll() { gpr_cv_broadcast(&cv_); } |
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void Wait(Mutex* mu) { |
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gpr_cv_wait(&cv_, &mu->mu_, gpr_inf_future(GPR_CLOCK_REALTIME)); |
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} |
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private: |
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gpr_cv cv_; |
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}; |
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#endif // GPR_ABSEIL_SYNC |
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template <typename Predicate> |
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GRPC_DEPRECATED("incompatible with thread safety analysis") |
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static void WaitUntil(CondVar* cv, Mutex* mu, Predicate pred) { |
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while (!pred()) { |
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cv->Wait(mu); |
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} |
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} |
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} // namespace internal |
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} // namespace grpc |
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#endif // GRPCPP_IMPL_SYNC_H
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