88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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/*
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Copyright (c) 2005-2021 Intel Corporation
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#ifndef __TBB_null_rw_mutex_H
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#define __TBB_null_rw_mutex_H
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#include "detail/_config.h"
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#include "detail/_namespace_injection.h"
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#include "detail/_mutex_common.h"
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namespace tbb {
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namespace detail {
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namespace d1 {
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//! A rw mutex which does nothing
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/** A null_rw_mutex is a rw mutex that does nothing and simulates successful operation.
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@ingroup synchronization */
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class null_rw_mutex {
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public:
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//! Constructors
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constexpr null_rw_mutex() noexcept = default;
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//! Destructor
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~null_rw_mutex() = default;
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//! No Copy
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null_rw_mutex(const null_rw_mutex&) = delete;
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null_rw_mutex& operator=(const null_rw_mutex&) = delete;
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//! Represents acquisition of a mutex.
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class scoped_lock {
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public:
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//! Constructors
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constexpr scoped_lock() noexcept = default;
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scoped_lock(null_rw_mutex&, bool = true) {}
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//! Destructor
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~scoped_lock() = default;
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//! No Copy
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scoped_lock(const scoped_lock&) = delete;
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scoped_lock& operator=(const scoped_lock&) = delete;
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void acquire(null_rw_mutex&, bool = true) {}
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bool try_acquire(null_rw_mutex&, bool = true) { return true; }
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void release() {}
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bool upgrade_to_writer() { return true; }
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bool downgrade_to_reader() { return true; }
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bool is_writer() const { return true; }
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};
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//! Mutex traits
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static constexpr bool is_rw_mutex = true;
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static constexpr bool is_recursive_mutex = true;
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static constexpr bool is_fair_mutex = true;
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void lock() {}
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bool try_lock() { return true; }
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void unlock() {}
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void lock_shared() {}
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bool try_lock_shared() { return true; }
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void unlock_shared() {}
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}; // class null_rw_mutex
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} // namespace d1
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} // namespace detail
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inline namespace v1 {
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using detail::d1::null_rw_mutex;
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} // namespace v1
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} // namespace tbb
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#endif /* __TBB_null_rw_mutex_H */
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