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+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_STUBS_MUTEX_H_
+#define GOOGLE_PROTOBUF_STUBS_MUTEX_H_
+
+#include <mutex>
+
+#ifdef GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP
+
+#include <windows.h>
+
+// GetMessage conflicts with GeneratedMessageReflection::GetMessage().
+#ifdef GetMessage
+#undef GetMessage
+#endif
+
+#endif
+
+#include <stubs/macros.h>
+
+// Define thread-safety annotations for use below, if we are building with
+// Clang.
+#if defined(__clang__) && !defined(SWIG)
+#define GOOGLE_PROTOBUF_ACQUIRE(...) \
+ __attribute__((acquire_capability(__VA_ARGS__)))
+#define GOOGLE_PROTOBUF_RELEASE(...) \
+ __attribute__((release_capability(__VA_ARGS__)))
+#define GOOGLE_PROTOBUF_SCOPED_CAPABILITY __attribute__((scoped_lockable))
+#define GOOGLE_PROTOBUF_CAPABILITY(x) __attribute__((capability(x)))
+#else
+#define GOOGLE_PROTOBUF_ACQUIRE(...)
+#define GOOGLE_PROTOBUF_RELEASE(...)
+#define GOOGLE_PROTOBUF_SCOPED_CAPABILITY
+#define GOOGLE_PROTOBUF_CAPABILITY(x)
+#endif
+
+#include <port_def.inc>
+
+// ===================================================================
+// emulates google3/base/mutex.h
+namespace google {
+namespace protobuf {
+namespace internal {
+
+#define GOOGLE_PROTOBUF_LINKER_INITIALIZED
+
+#ifdef GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP
+
+// This class is a lightweight replacement for std::mutex on Windows platforms.
+// std::mutex does not work on Windows XP SP2 with the latest VC++ libraries,
+// because it utilizes the Concurrency Runtime that is only supported on Windows
+// XP SP3 and above.
+class PROTOBUF_EXPORT CriticalSectionLock {
+ public:
+ CriticalSectionLock() { InitializeCriticalSection(&critical_section_); }
+ ~CriticalSectionLock() { DeleteCriticalSection(&critical_section_); }
+ void lock() { EnterCriticalSection(&critical_section_); }
+ void unlock() { LeaveCriticalSection(&critical_section_); }
+
+ private:
+ CRITICAL_SECTION critical_section_;
+
+ GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CriticalSectionLock);
+};
+
+#endif
+
+// In MSVC std::mutex does not have a constexpr constructor.
+// This wrapper makes the constructor constexpr.
+template <typename T>
+class CallOnceInitializedMutex {
+ public:
+ constexpr CallOnceInitializedMutex() : flag_{}, buf_{} {}
+ ~CallOnceInitializedMutex() { get().~T(); }
+
+ void lock() { get().lock(); }
+ void unlock() { get().unlock(); }
+
+ private:
+ T& get() {
+ std::call_once(flag_, [&] { ::new (static_cast<void*>(&buf_)) T(); });
+ return reinterpret_cast<T&>(buf_);
+ }
+
+ std::once_flag flag_;
+ alignas(T) char buf_[sizeof(T)];
+};
+
+// Mutex is a natural type to wrap. As both google and other organization have
+// specialized mutexes. gRPC also provides an injection mechanism for custom
+// mutexes.
+class GOOGLE_PROTOBUF_CAPABILITY("mutex") PROTOBUF_EXPORT WrappedMutex {
+ public:
+#if defined(__QNX__)
+ constexpr WrappedMutex() = default;
+#else
+ constexpr WrappedMutex() {}
+#endif
+ void Lock() GOOGLE_PROTOBUF_ACQUIRE() { mu_.lock(); }
+ void Unlock() GOOGLE_PROTOBUF_RELEASE() { mu_.unlock(); }
+ // Crash if this Mutex is not held exclusively by this thread.
+ // May fail to crash when it should; will never crash when it should not.
+ void AssertHeld() const {}
+
+ private:
+#if defined(GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP)
+ CallOnceInitializedMutex<CriticalSectionLock> mu_{};
+#elif defined(_WIN32)
+ CallOnceInitializedMutex<std::mutex> mu_{};
+#else
+ std::mutex mu_{};
+#endif
+};
+
+using Mutex = WrappedMutex;
+
+// MutexLock(mu) acquires mu when constructed and releases it when destroyed.
+class GOOGLE_PROTOBUF_SCOPED_CAPABILITY PROTOBUF_EXPORT MutexLock {
+ public:
+ explicit MutexLock(Mutex* mu) GOOGLE_PROTOBUF_ACQUIRE(mu) : mu_(mu) {
+ this->mu_->Lock();
+ }
+ ~MutexLock() GOOGLE_PROTOBUF_RELEASE() { this->mu_->Unlock(); }
+
+ private:
+ Mutex *const mu_;
+ GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MutexLock);
+};
+
+// TODO(kenton): Implement these? Hard to implement portably.
+typedef MutexLock ReaderMutexLock;
+typedef MutexLock WriterMutexLock;
+
+// MutexLockMaybe is like MutexLock, but is a no-op when mu is nullptr.
+class PROTOBUF_EXPORT MutexLockMaybe {
+ public:
+ explicit MutexLockMaybe(Mutex *mu) :
+ mu_(mu) { if (this->mu_ != nullptr) { this->mu_->Lock(); } }
+ ~MutexLockMaybe() { if (this->mu_ != nullptr) { this->mu_->Unlock(); } }
+ private:
+ Mutex *const mu_;
+ GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MutexLockMaybe);
+};
+
+#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
+template<typename T>
+class ThreadLocalStorage {
+ public:
+ ThreadLocalStorage() {
+ pthread_key_create(&key_, &ThreadLocalStorage::Delete);
+ }
+ ~ThreadLocalStorage() {
+ pthread_key_delete(key_);
+ }
+ T* Get() {
+ T* result = static_cast<T*>(pthread_getspecific(key_));
+ if (result == nullptr) {
+ result = new T();
+ pthread_setspecific(key_, result);
+ }
+ return result;
+ }
+ private:
+ static void Delete(void* value) {
+ delete static_cast<T*>(value);
+ }
+ pthread_key_t key_;
+
+ GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ThreadLocalStorage);
+};
+#endif
+
+} // namespace internal
+
+// We made these internal so that they would show up as such in the docs,
+// but we don't want to stick "internal::" in front of them everywhere.
+using internal::Mutex;
+using internal::MutexLock;
+using internal::ReaderMutexLock;
+using internal::WriterMutexLock;
+using internal::MutexLockMaybe;
+
+} // namespace protobuf
+} // namespace google
+
+#undef GOOGLE_PROTOBUF_ACQUIRE
+#undef GOOGLE_PROTOBUF_RELEASE
+
+#include <port_undef.inc>
+
+#endif // GOOGLE_PROTOBUF_STUBS_MUTEX_H_