88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/*
|
|
Copyright (c) 2005-2021 Intel Corporation
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
#ifndef __TBB_null_rw_mutex_H
|
|
#define __TBB_null_rw_mutex_H
|
|
|
|
#include "detail/_config.h"
|
|
#include "detail/_namespace_injection.h"
|
|
#include "detail/_mutex_common.h"
|
|
|
|
namespace tbb {
|
|
namespace detail {
|
|
namespace d1 {
|
|
|
|
//! A rw mutex which does nothing
|
|
/** A null_rw_mutex is a rw mutex that does nothing and simulates successful operation.
|
|
@ingroup synchronization */
|
|
class null_rw_mutex {
|
|
public:
|
|
//! Constructors
|
|
constexpr null_rw_mutex() noexcept = default;
|
|
|
|
//! Destructor
|
|
~null_rw_mutex() = default;
|
|
|
|
//! No Copy
|
|
null_rw_mutex(const null_rw_mutex&) = delete;
|
|
null_rw_mutex& operator=(const null_rw_mutex&) = delete;
|
|
|
|
//! Represents acquisition of a mutex.
|
|
class scoped_lock {
|
|
public:
|
|
//! Constructors
|
|
constexpr scoped_lock() noexcept = default;
|
|
scoped_lock(null_rw_mutex&, bool = true) {}
|
|
|
|
//! Destructor
|
|
~scoped_lock() = default;
|
|
|
|
//! No Copy
|
|
scoped_lock(const scoped_lock&) = delete;
|
|
scoped_lock& operator=(const scoped_lock&) = delete;
|
|
|
|
void acquire(null_rw_mutex&, bool = true) {}
|
|
bool try_acquire(null_rw_mutex&, bool = true) { return true; }
|
|
void release() {}
|
|
bool upgrade_to_writer() { return true; }
|
|
bool downgrade_to_reader() { return true; }
|
|
|
|
bool is_writer() const { return true; }
|
|
};
|
|
|
|
//! Mutex traits
|
|
static constexpr bool is_rw_mutex = true;
|
|
static constexpr bool is_recursive_mutex = true;
|
|
static constexpr bool is_fair_mutex = true;
|
|
|
|
void lock() {}
|
|
bool try_lock() { return true; }
|
|
void unlock() {}
|
|
void lock_shared() {}
|
|
bool try_lock_shared() { return true; }
|
|
void unlock_shared() {}
|
|
}; // class null_rw_mutex
|
|
|
|
} // namespace d1
|
|
} // namespace detail
|
|
|
|
inline namespace v1 {
|
|
using detail::d1::null_rw_mutex;
|
|
} // namespace v1
|
|
} // namespace tbb
|
|
|
|
#endif /* __TBB_null_rw_mutex_H */
|