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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
 // Software License, Version 1.0. (See accompanying file
 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 // See http://www.boost.org/libs/interprocess for documentation.
 //
 //////////////////////////////////////////////////////////////////////////////
 
 #ifndef BOOST_INTERPROCESS_NAMED_UPGRADABLE_MUTEX_HPP
 #define BOOST_INTERPROCESS_NAMED_UPGRADABLE_MUTEX_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 #
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/interprocess/detail/config_begin.hpp>
 #include <boost/interprocess/detail/workaround.hpp>
 #include <boost/interprocess/creation_tags.hpp>
 #include <boost/interprocess/exceptions.hpp>
 #include <boost/interprocess/shared_memory_object.hpp>
 #include <boost/interprocess/detail/managed_open_or_create_impl.hpp>
 #include <boost/interprocess/sync/interprocess_upgradable_mutex.hpp>
 #include <boost/interprocess/sync/shm/named_creation_functor.hpp>
 #include <boost/interprocess/permissions.hpp>
 
 //!\file
 //!Describes a named upgradable mutex class for inter-process synchronization
 
 namespace boost {
 namespace interprocess {
 
 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 namespace ipcdetail{ class interprocess_tester; }
 #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 class named_condition;
 
 //!A upgradable mutex with a global name, so it can be found from different
 //!processes. This mutex can't be placed in shared memory, and
 //!each process should have it's own named upgradable mutex.
 class named_upgradable_mutex
 {
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    //Non-copyable
    named_upgradable_mutex();
    named_upgradable_mutex(const named_upgradable_mutex &);
    named_upgradable_mutex &operator=(const named_upgradable_mutex &);
    friend class named_condition;
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
    public:
 
    //!Creates a global upgradable mutex with a name.
    //!If the upgradable mutex can't be created throws interprocess_exception
    named_upgradable_mutex(create_only_t, const char *name, const permissions &perm = permissions());
 
    //!Opens or creates a global upgradable mutex with a name, and an initial count.
    //!If the upgradable mutex is created, this call is equivalent to
    //!named_upgradable_mutex(create_only_t, ...)
    //!If the upgradable mutex is already created, this call is equivalent to
    //!named_upgradable_mutex(open_only_t, ... ).
    named_upgradable_mutex(open_or_create_t, const char *name, const permissions &perm = permissions());
 
    //!Opens a global upgradable mutex with a name if that upgradable mutex
    //!is previously.
    //!created. If it is not previously created this function throws
    //!interprocess_exception.
    named_upgradable_mutex(open_only_t, const char *name);
 
    //!Destroys *this and indicates that the calling process is finished using
    //!the resource. The destructor function will deallocate
    //!any system resources allocated by the system for use by this process for
    //!this resource. The resource can still be opened again calling
    //!the open constructor overload. To erase the resource from the system
    //!use remove().
    ~named_upgradable_mutex();
 
    //Exclusive locking
 
    //!Effects: The calling thread tries to obtain exclusive ownership of the mutex,
    //!   and if another thread has exclusive, sharable or upgradable ownership of
    //!   the mutex, it waits until it can obtain the ownership.
    //!Throws: interprocess_exception on error.
    void lock();
 
    //!Effects: The calling thread tries to acquire exclusive ownership of the mutex
    //!   without waiting. If no other thread has exclusive, sharable or upgradable
    //!   ownership of the mutex this succeeds.
    //!Returns: If it can acquire exclusive ownership immediately returns true.
    //!   If it has to wait, returns false.
    //!Throws: interprocess_exception on error.
    bool try_lock();
 
    //!Effects: The calling thread tries to acquire exclusive ownership of the mutex
    //!   waiting if necessary until no other thread has exclusive, sharable or
    //!   upgradable ownership of the mutex or abs_time is reached.
    //!Returns: If acquires exclusive ownership, returns true. Otherwise returns false.
    //!Throws: interprocess_exception on error.
    template<class TimePoint>
    bool timed_lock(const TimePoint &abs_time);
 
    //!Precondition: The thread must have exclusive ownership of the mutex.
    //!Effects: The calling thread releases the exclusive ownership of the mutex.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock();
 
    //Sharable locking
 
    //!Effects: The calling thread tries to obtain sharable ownership of the mutex,
    //!   and if another thread has exclusive ownership of the mutex,
    //!   waits until it can obtain the ownership.
    //!Throws: interprocess_exception on error.
    void lock_sharable();
 
    //!Effects: The calling thread tries to acquire sharable ownership of the mutex
    //!   without waiting. If no other thread has exclusive ownership
    //!   of the mutex this succeeds.
    //!Returns: If it can acquire sharable ownership immediately returns true. If it
    //!   has to wait, returns false.
    //!Throws: interprocess_exception on error.
    bool try_lock_sharable();
 
    //!Effects: The calling thread tries to acquire sharable ownership of the mutex
    //!   waiting if necessary until no other thread has exclusive
    //!   ownership of the mutex or abs_time is reached.
    //!Returns: If acquires sharable ownership, returns true. Otherwise returns false.
    //!Throws: interprocess_exception on error.
    template<class TimePoint>
    bool timed_lock_sharable(const TimePoint &abs_time);
 
    //!Precondition: The thread must have sharable ownership of the mutex.
    //!Effects: The calling thread releases the sharable ownership of the mutex.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_sharable();
 
    //Upgradable locking
 
    //!Effects: The calling thread tries to obtain upgradable ownership of the mutex,
    //!   and if another thread has exclusive or upgradable ownership of the mutex,
    //!   waits until it can obtain the ownership.
    //!Throws: interprocess_exception on error.
    void lock_upgradable();
 
    //!Effects: The calling thread tries to acquire upgradable ownership of the mutex
    //!   without waiting. If no other thread has exclusive or upgradable ownership
    //!   of the mutex this succeeds.
    //!Returns: If it can acquire upgradable ownership immediately returns true.
    //!   If it has to wait, returns false.
    //!Throws: interprocess_exception on error.
    bool try_lock_upgradable();
 
    //!Effects: The calling thread tries to acquire upgradable ownership of the mutex
    //!   waiting if necessary until no other thread has exclusive or upgradable
    //!   ownership of the mutex or abs_time is reached.
    //!Returns: If acquires upgradable ownership, returns true. Otherwise returns false.
    //!Throws: interprocess_exception on error.
    template<class TimePoint>
    bool timed_lock_upgradable(const TimePoint &abs_time);
 
    //!Precondition: The thread must have upgradable ownership of the mutex.
    //!Effects: The calling thread releases the upgradable ownership of the mutex.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_upgradable();
 
    //Demotions
 
    //!Precondition: The thread must have exclusive ownership of the mutex.
    //!Effects: The thread atomically releases exclusive ownership and acquires
    //!   upgradable ownership. This operation is non-blocking.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_and_lock_upgradable();
 
    //!Precondition: The thread must have exclusive ownership of the mutex.
    //!Effects: The thread atomically releases exclusive ownership and acquires
    //!   sharable ownership. This operation is non-blocking.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_and_lock_sharable();
 
    //!Precondition: The thread must have upgradable ownership of the mutex.
    //!Effects: The thread atomically releases upgradable ownership and acquires
    //!   sharable ownership. This operation is non-blocking.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_upgradable_and_lock_sharable();
 
    //Promotions
 
    //!Precondition: The thread must have upgradable ownership of the mutex.
    //!Effects: The thread atomically releases upgradable ownership and acquires
    //!   exclusive ownership. This operation will block until all threads with
    //!   sharable ownership release it.
    //!Throws: An exception derived from interprocess_exception on error.
    void unlock_upgradable_and_lock();
 
    //!Precondition: The thread must have upgradable ownership of the mutex.
    //!Effects: The thread atomically releases upgradable ownership and tries to
    //!   acquire exclusive ownership. This operation will fail if there are threads
    //!   with sharable ownership, but it will maintain upgradable ownership.
    //!Returns: If acquires exclusive ownership, returns true. Otherwise returns false.
    //!Throws: An exception derived from interprocess_exception on error.
    bool try_unlock_upgradable_and_lock();
 
    //!Precondition: The thread must have upgradable ownership of the mutex.
    //!Effects: The thread atomically releases upgradable ownership and tries to acquire
    //!   exclusive ownership, waiting if necessary until abs_time. This operation will
    //!   fail if there are threads with sharable ownership or timeout reaches, but it
    //!   will maintain upgradable ownership.
    //!Returns: If acquires exclusive ownership, returns true. Otherwise returns false.
    //!Throws: An exception derived from interprocess_exception on error.
    template<class TimePoint>
    bool timed_unlock_upgradable_and_lock(const TimePoint &abs_time);
 
    //!Precondition: The thread must have sharable ownership of the mutex.
    //!Effects: The thread atomically releases sharable ownership and tries to acquire
    //!   exclusive ownership. This operation will fail if there are threads with sharable
    //!   or upgradable ownership, but it will maintain sharable ownership.
    //!Returns: If acquires exclusive ownership, returns true. Otherwise returns false.
    //!Throws: An exception derived from interprocess_exception on error.
    bool try_unlock_sharable_and_lock();
 
    bool try_unlock_sharable_and_lock_upgradable();
 
    //!Erases a named upgradable mutex from the system.
    //!Returns false on error. Never throws.
    static bool remove(const char *name);
 
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    private:
    friend class ipcdetail::interprocess_tester;
    void dont_close_on_destruction();
 
    interprocess_upgradable_mutex *mutex() const
    {  return static_cast<interprocess_upgradable_mutex*>(m_shmem.get_user_address()); }
 
    typedef ipcdetail::managed_open_or_create_impl<shared_memory_object, 0, true, false> open_create_impl_t;
    open_create_impl_t m_shmem;
    typedef ipcdetail::named_creation_functor<interprocess_upgradable_mutex> construct_func_t;
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 };
 
 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
 
 inline named_upgradable_mutex::~named_upgradable_mutex()
 {}
 
 inline named_upgradable_mutex::named_upgradable_mutex
    (create_only_t, const char *name, const permissions &perm)
    :  m_shmem  (create_only_t()
                ,name
                ,sizeof(interprocess_upgradable_mutex) +
                   open_create_impl_t::ManagedOpenOrCreateUserOffset
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoCreate)
                ,perm)
 {}
 
 inline named_upgradable_mutex::named_upgradable_mutex
    (open_or_create_t, const char *name, const permissions &perm)
    :  m_shmem  (open_or_create_t()
                ,name
                ,sizeof(interprocess_upgradable_mutex) +
                   open_create_impl_t::ManagedOpenOrCreateUserOffset
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoOpenOrCreate)
                ,perm)
 {}
 
 inline named_upgradable_mutex::named_upgradable_mutex
    (open_only_t, const char *name)
    :  m_shmem  (open_only_t()
                ,name
                ,read_write
                ,0
                ,construct_func_t(ipcdetail::DoOpen))
 {}
 
 inline void named_upgradable_mutex::dont_close_on_destruction()
 {  ipcdetail::interprocess_tester::dont_close_on_destruction(m_shmem);  }
 
 inline void named_upgradable_mutex::lock()
 {  this->mutex()->lock();  }
 
 inline void named_upgradable_mutex::unlock()
 {  this->mutex()->unlock();  }
 
 inline bool named_upgradable_mutex::try_lock()
 {  return this->mutex()->try_lock();  }
 
 template<class TimePoint>
 inline bool named_upgradable_mutex::timed_lock(const TimePoint &abs_time)
 {  return this->mutex()->timed_lock(abs_time);  }
 
 inline void named_upgradable_mutex::lock_upgradable()
 {  this->mutex()->lock_upgradable();  }
 
 inline void named_upgradable_mutex::unlock_upgradable()
 {  this->mutex()->unlock_upgradable();  }
 
 inline bool named_upgradable_mutex::try_lock_upgradable()
 {  return this->mutex()->try_lock_upgradable();  }
 
 template<class TimePoint>
 inline bool named_upgradable_mutex::timed_lock_upgradable(const TimePoint &abs_time)
 {  return this->mutex()->timed_lock_upgradable(abs_time);   }
 
 inline void named_upgradable_mutex::lock_sharable()
 {  this->mutex()->lock_sharable();  }
 
 inline void named_upgradable_mutex::unlock_sharable()
 {  this->mutex()->unlock_sharable();  }
 
 inline bool named_upgradable_mutex::try_lock_sharable()
 {  return this->mutex()->try_lock_sharable();  }
 
 template<class TimePoint>
 inline bool named_upgradable_mutex::timed_lock_sharable(const TimePoint &abs_time)
 {  return this->mutex()->timed_lock_sharable(abs_time);  }
 
 inline void named_upgradable_mutex::unlock_and_lock_upgradable()
 {  this->mutex()->unlock_and_lock_upgradable();  }
 
 inline void named_upgradable_mutex::unlock_and_lock_sharable()
 {  this->mutex()->unlock_and_lock_sharable();  }
 
 inline void named_upgradable_mutex::unlock_upgradable_and_lock_sharable()
 {  this->mutex()->unlock_upgradable_and_lock_sharable();  }
 
 inline void named_upgradable_mutex::unlock_upgradable_and_lock()
 {  this->mutex()->unlock_upgradable_and_lock();  }
 
 inline bool named_upgradable_mutex::try_unlock_upgradable_and_lock()
 {  return this->mutex()->try_unlock_upgradable_and_lock();  }
 
 template<class TimePoint>
 inline bool named_upgradable_mutex::timed_unlock_upgradable_and_lock(const TimePoint &abs_time)
 {  return this->mutex()->timed_unlock_upgradable_and_lock(abs_time);  }
 
 inline bool named_upgradable_mutex::try_unlock_sharable_and_lock()
 {  return this->mutex()->try_unlock_sharable_and_lock();  }
 
 inline bool named_upgradable_mutex::try_unlock_sharable_and_lock_upgradable()
 {  return this->mutex()->try_unlock_sharable_and_lock_upgradable();  }
 
 inline bool named_upgradable_mutex::remove(const char *name)
 {  return shared_memory_object::remove(name); }
 
 #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 }  //namespace interprocess {
 }  //namespace boost {
 
 #include <boost/interprocess/detail/config_end.hpp>
 
 #endif   //BOOST_INTERPROCESS_NAMED_UPGRADABLE_MUTEX_HPP

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