FM / detail

/usr/include/oneapi/tbb/detail

Name	Size	Mode	Actions
_aggregator.h	7562	0644	edit dl rm
_aligned_space.h	1399	0644	edit dl rm
_allocator_traits.h	3807	0644	edit dl rm
_assert.h	2392	0644	edit dl rm
_concurrent_queue_base.h	26360	0644	edit dl rm
_concurrent_skip_list.h	46628	0644	edit dl rm
_concurrent_unordered_base.h	64656	0644	edit dl rm
_config.h	20382	0644	edit dl rm
_containers_helpers.h	2627	0644	edit dl rm
_exception.h	2715	0644	edit dl rm
_export.h	1199	0644	edit dl rm
_flow_graph_body_impl.h	12776	0644	edit dl rm
_flow_graph_cache_impl.h	13615	0644	edit dl rm
_flow_graph_impl.h	15360	0644	edit dl rm
_flow_graph_indexer_impl.h	16529	0644	edit dl rm
_flow_graph_item_buffer_impl.h	10359	0644	edit dl rm
_flow_graph_join_impl.h	82886	0644	edit dl rm
_flow_graph_nodes_deduction.h	9532	0644	edit dl rm
_flow_graph_node_impl.h	27545	0644	edit dl rm
_flow_graph_node_set_impl.h	10177	0644	edit dl rm
_flow_graph_tagged_buffer_impl.h	10318	0644	edit dl rm
_flow_graph_trace_impl.h	15974	0644	edit dl rm
_flow_graph_types_impl.h	15623	0644	edit dl rm
_hash_compare.h	4488	0644	edit dl rm
_intrusive_list_node.h	1462	0644	edit dl rm
_machine.h	13042	0644	edit dl rm
_mutex_common.h	2347	0644	edit dl rm
_namespace_injection.h	815	0644	edit dl rm
_node_handle.h	5173	0644	edit dl rm
_pipeline_filters.h	15905	0644	edit dl rm
_pipeline_filters_deduction.h	1529	0644	edit dl rm
_range_common.h	4643	0644	edit dl rm
_rtm_mutex.h	4785	0644	edit dl rm
_rtm_rw_mutex.h	7210	0644	edit dl rm
_scoped_lock.h	5009	0644	edit dl rm
_segment_table.h	24750	0644	edit dl rm
_small_object_pool.h	3574	0644	edit dl rm
_string_resource.h	3872	0644	edit dl rm
_task.h	7116	0644	edit dl rm
_task_handle.h	3688	0644	edit dl rm
_template_helpers.h	13517	0644	edit dl rm
_utils.h	13318	0644	edit dl rm
_waitable_atomic.h	3532	0644	edit dl rm

Edit: /usr/include/oneapi/tbb/detail/_rtm_rw_mutex.h (7210B)

/*
    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_detail__rtm_rw_mutex_H
#define __TBB_detail__rtm_rw_mutex_H

#include "_assert.h"
#include "_utils.h"
#include "../spin_rw_mutex.h"

#include <atomic>

namespace tbb {
namespace detail {

namespace r1 {
struct rtm_rw_mutex_impl;
}

namespace d1 {

constexpr std::size_t speculation_granularity = 64;
#if _MSC_VER && !defined(__INTEL_COMPILER)
    // Suppress warning: structure was padded due to alignment specifier
    #pragma warning (push)
    #pragma warning (disable: 4324)
#endif

//! Fast, unfair, spinning speculation-enabled reader-writer lock with backoff and writer-preference
/** @ingroup synchronization */
class alignas(max_nfs_size) rtm_rw_mutex : private spin_rw_mutex {
    friend struct r1::rtm_rw_mutex_impl;
private:
    enum class rtm_type {
        rtm_not_in_mutex,
        rtm_transacting_reader,
        rtm_transacting_writer,
        rtm_real_reader,
        rtm_real_writer
    };
public:
    //! Constructors
    rtm_rw_mutex() noexcept : write_flag(false) {
        create_itt_sync(this, "tbb::speculative_spin_rw_mutex", "");
    }

//! Destructor
    ~rtm_rw_mutex() = default;

//! Represents acquisition of a mutex.
    class scoped_lock {
        friend struct r1::rtm_rw_mutex_impl;
    public:
        //! Construct lock that has not acquired a mutex.
        /** Equivalent to zero-initialization of *this. */
        constexpr scoped_lock() : m_mutex(nullptr), m_transaction_state(rtm_type::rtm_not_in_mutex) {}

//! Acquire lock on given mutex.
        scoped_lock(rtm_rw_mutex& m, bool write = true) : m_mutex(nullptr), m_transaction_state(rtm_type::rtm_not_in_mutex) {
            acquire(m, write);
        }

//! Release lock (if lock is held).
        ~scoped_lock() {
            if(m_transaction_state != rtm_type::rtm_not_in_mutex) {
                release();
            }
        }

//! No Copy
        scoped_lock(const scoped_lock&) = delete;
        scoped_lock& operator=(const scoped_lock&) = delete;

//! Acquire lock on given mutex.
        inline void acquire(rtm_rw_mutex& m, bool write = true);

//! Try acquire lock on given mutex.
        inline bool try_acquire(rtm_rw_mutex& m, bool write = true);

//! Release lock
        inline void release();

//! Upgrade reader to become a writer.
        /** Returns whether the upgrade happened without releasing and re-acquiring the lock */
        inline bool upgrade_to_writer();

//! Downgrade writer to become a reader.
        inline bool downgrade_to_reader();

inline bool is_writer() const;
    private:
        rtm_rw_mutex* m_mutex;
        rtm_type m_transaction_state;
    };

//! Mutex traits
    static constexpr bool is_rw_mutex = true;
    static constexpr bool is_recursive_mutex = false;
    static constexpr bool is_fair_mutex = false;

private:
    alignas(speculation_granularity) std::atomic<bool> write_flag;
};

#if _MSC_VER && !defined(__INTEL_COMPILER)
    #pragma warning (pop) // 4324 warning
#endif

} // namespace d1

namespace r1 {
    //! Internal acquire write lock.
    // only_speculate == true if we're doing a try_lock, else false.
    TBB_EXPORT void __TBB_EXPORTED_FUNC acquire_writer(d1::rtm_rw_mutex&, d1::rtm_rw_mutex::scoped_lock&, bool only_speculate = false);
    //! Internal acquire read lock.
    // only_speculate == true if we're doing a try_lock, else false.
    TBB_EXPORT void __TBB_EXPORTED_FUNC acquire_reader(d1::rtm_rw_mutex&, d1::rtm_rw_mutex::scoped_lock&, bool only_speculate = false);
    //! Internal upgrade reader to become a writer.
    TBB_EXPORT bool __TBB_EXPORTED_FUNC upgrade(d1::rtm_rw_mutex::scoped_lock&);
    //! Internal downgrade writer to become a reader.
    TBB_EXPORT bool __TBB_EXPORTED_FUNC downgrade(d1::rtm_rw_mutex::scoped_lock&);
    //! Internal try_acquire write lock.
    TBB_EXPORT bool __TBB_EXPORTED_FUNC try_acquire_writer(d1::rtm_rw_mutex&, d1::rtm_rw_mutex::scoped_lock&);
    //! Internal try_acquire read lock.
    TBB_EXPORT bool __TBB_EXPORTED_FUNC try_acquire_reader(d1::rtm_rw_mutex&, d1::rtm_rw_mutex::scoped_lock&);
    //! Internal release lock.
    TBB_EXPORT void __TBB_EXPORTED_FUNC release(d1::rtm_rw_mutex::scoped_lock&);
}

namespace d1 {
//! Acquire lock on given mutex.
void rtm_rw_mutex::scoped_lock::acquire(rtm_rw_mutex& m, bool write) {
    __TBB_ASSERT(!m_mutex, "lock is already acquired");
    if (write) {
        r1::acquire_writer(m, *this);
    } else {
        r1::acquire_reader(m, *this);
    }
}

//! Try acquire lock on given mutex.
bool rtm_rw_mutex::scoped_lock::try_acquire(rtm_rw_mutex& m, bool write) {
    __TBB_ASSERT(!m_mutex, "lock is already acquired");
    if (write) {
        return r1::try_acquire_writer(m, *this);
    } else {
        return r1::try_acquire_reader(m, *this);
    }
}

//! Release lock
void rtm_rw_mutex::scoped_lock::release() {
    __TBB_ASSERT(m_mutex, "lock is not acquired");
    __TBB_ASSERT(m_transaction_state != rtm_type::rtm_not_in_mutex, "lock is not acquired");
    return r1::release(*this);
}

//! Upgrade reader to become a writer.
/** Returns whether the upgrade happened without releasing and re-acquiring the lock */
bool rtm_rw_mutex::scoped_lock::upgrade_to_writer() {
    __TBB_ASSERT(m_mutex, "lock is not acquired");
    if (m_transaction_state == rtm_type::rtm_transacting_writer || m_transaction_state == rtm_type::rtm_real_writer) {
        return true; // Already a writer
    }
    return r1::upgrade(*this);
}

//! Downgrade writer to become a reader.
bool rtm_rw_mutex::scoped_lock::downgrade_to_reader() {
    __TBB_ASSERT(m_mutex, "lock is not acquired");
    if (m_transaction_state == rtm_type::rtm_transacting_reader || m_transaction_state == rtm_type::rtm_real_reader) {
        return true; // Already a reader
    }
    return r1::downgrade(*this);
}

bool rtm_rw_mutex::scoped_lock::is_writer() const {
    __TBB_ASSERT(m_mutex, "lock is not acquired");
    return m_transaction_state == rtm_type::rtm_transacting_writer || m_transaction_state == rtm_type::rtm_real_writer;
}

#if TBB_USE_PROFILING_TOOLS
inline void set_name(rtm_rw_mutex& obj, const char* name) {
    itt_set_sync_name(&obj, name);
}
#if (_WIN32||_WIN64)
inline void set_name(rtm_rw_mutex& obj, const wchar_t* name) {
    itt_set_sync_name(&obj, name);
}
#endif // WIN
#else
inline void set_name(rtm_rw_mutex&, const char*) {}
#if (_WIN32||_WIN64)
inline void set_name(rtm_rw_mutex&, const wchar_t*) {}
#endif // WIN
#endif

} // namespace d1
} // namespace detail
} // namespace tbb

#endif // __TBB_detail__rtm_rw_mutex_H

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