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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_
#ifdef GOOGLE_PROTOBUF_NO_THREADLOCAL
#include <pthread.h>
#endif
#include <google/protobuf/stubs/macros.h>
// ===================================================================
// emulates google3/base/mutex.h
namespace google {
namespace protobuf {
namespace internal {
// A Mutex is a non-reentrant (aka non-recursive) mutex. At most one thread T
// may hold a mutex at a given time. If T attempts to Lock() the same Mutex
// while holding it, T will deadlock.
class LIBPROTOBUF_EXPORT Mutex {
public:
// Create a Mutex that is not held by anybody.
Mutex();
// Destructor
~Mutex();
// Block if necessary until this Mutex is free, then acquire it exclusively.
void Lock();
// Release this Mutex. Caller must hold it exclusively.
void 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();
private:
struct Internal;
Internal* mInternal;
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Mutex);
};
// MutexLock(mu) acquires mu when constructed and releases it when destroyed.
class LIBPROTOBUF_EXPORT MutexLock {
public:
explicit MutexLock(Mutex *mu) : mu_(mu) { this->mu_->Lock(); }
~MutexLock() { 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 NULL.
class LIBPROTOBUF_EXPORT MutexLockMaybe {
public:
explicit MutexLockMaybe(Mutex *mu) :
mu_(mu) { if (this->mu_ != NULL) { this->mu_->Lock(); } }
~MutexLockMaybe() { if (this->mu_ != NULL) { 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 == NULL) {
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
#endif // GOOGLE_PROTOBUF_STUBS_MUTEX_H_
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